CA1169130A - Polarized signal receiver system - Google Patents
Polarized signal receiver systemInfo
- Publication number
- CA1169130A CA1169130A CA000405815A CA405815A CA1169130A CA 1169130 A CA1169130 A CA 1169130A CA 000405815 A CA000405815 A CA 000405815A CA 405815 A CA405815 A CA 405815A CA 1169130 A CA1169130 A CA 1169130A
- Authority
- CA
- Canada
- Prior art keywords
- waveguide
- signal receiver
- receiver
- circular
- polarized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000523 sample Substances 0.000 claims abstract description 19
- 239000012212 insulator Substances 0.000 claims abstract description 13
- 239000004020 conductor Substances 0.000 claims abstract description 12
- 230000010287 polarization Effects 0.000 claims abstract description 10
- 230000008054 signal transmission Effects 0.000 claims abstract 2
- 230000005540 biological transmission Effects 0.000 claims description 24
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 206010009696 Clumsiness Diseases 0.000 description 1
- 235000012571 Ficus glomerata Nutrition 0.000 description 1
- 240000000365 Ficus racemosa Species 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 235000015125 Sterculia urens Nutrition 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/082—Transitions between hollow waveguides of different shape, e.g. between a rectangular and a circular waveguide
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/165—Auxiliary devices for rotating the plane of polarisation
- H01P1/17—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
- H01Q21/245—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction provided with means for varying the polarisation
Abstract
ABSTRACT
A rotatable polarized signal receiver in a system for receiving linearly polarized electromagnetic signals includes a signal conductor having a receiver probe portion, oriented in a circular waveguide parallel to the polariza-tion of the incident signal, and signal launch probe portion extending into the rectangular waveguide orthogonal to the direction of signal transmission therein, mounted concen-trically in an insulator rod through perpendicular coupling of the circular and rectangular waveguides.
A rotatable polarized signal receiver in a system for receiving linearly polarized electromagnetic signals includes a signal conductor having a receiver probe portion, oriented in a circular waveguide parallel to the polariza-tion of the incident signal, and signal launch probe portion extending into the rectangular waveguide orthogonal to the direction of signal transmission therein, mounted concen-trically in an insulator rod through perpendicular coupling of the circular and rectangular waveguides.
Description
13~
POLARIZED SIGNAL RECEIVER SYSTEM
Background and Summary of the Invention In satellite retransmission of communication signals, two linearly polarized signals, rot~ted 90 de~rees from each other, are used. In less expensive installations for receiving such signals, the feed horn for the receiving system is installed with the orientation parallel to the desired signal polarization. The other polarization is not detected and is simply reflected back out of the feed horn. For more expensive installations, the entire feed horn and low noise amplifier system is mounted on a rotator similar to the type used on home television antennas to select the desired signal polarization.
While the above-mentioned systems are cost effect-ive, they are mechanically cumbersome and limit system performance. Other prior art signal polarization rotators electrically rotate the signal field in a ferrite media.
While such rotators eliminate the mechanical clumsiness of the above-descrlbed rotators, they are expensive and introduce addltional signal losses (approximate 0.2 DB) int:o the receiving system. See, for example, such an elec-tr~nic antennae rotator marked by Luly Telecommunications Corp., P.O. Box 2311, San Bernardino, CA., and called a LULY (trade mark) polarizer by that company.
The present invention eliminates the mechanical disadvantages of several prior art rotators and eliminates signal losses associated with other prior art rotators. A
signal detector constructed according to the principles of the present invention comprises a transmission line having a signal receiver probe portion ("RP portion") and a signal launch probe portion ("LP portion") mounted in dielectric rod at the one end of a circular waveguide and a rectangular wave-guide perpendicularly coupled to the circular waveguide. The ~7' ,2" ~.
llti'1130 RP portion of the transmission line detects polarized incoming signals in the circular waveguide and the LP
portion launches the detected signal into the rectangular waveguide for transmission to a low noise amplifier ("LNA").
In the preferred embodiment, the transmission line, by its coupling to the insulator rod, may be rotated continuously and selectively by a servo motor mounted on the waveguide assembly. As the RP portion rotates to receive the desired signal, the LP portion also rotates.
However, the launched signal or the signal received at the LNA is unaffected because rotation of the LP portion is about its axis of symmetry in the rectangular wave-guide. The RP portion in the circular waveguide rotates between the two orthogonally polarized signals impinging on the feed horn. By rotation to the desired polariza-tion, that signal is received and the other reflected.
The selected signal is then conducted along the trans-mission line to the rear wall of the circular waveguide portion of the feed horn and is launched into the rectan-0 gular waveguide by the LP portion~An aspect of the invention is as follows:
A polarized signal receiver comprising:
a first waveguide for transmitting polarized signals;
a circular waveguide for receiving polarized signals at one end and coupled to the first waveguide at the other end, said other end having a rear wall;
an insulator rod, rotatably mounted through said other end of the circular waveguide; and signal conducting means, fixedly mounted in the insu-0 lator rod concentric with the axis of rotation thereof having 1 1~ 3() a receiver probe portion oriented in the circular waveguideorthogonal to the axis of said circular waveguide for receiving one polarization of the incident signal, a launch probe portion concentric with the insulator rod and extending into the first waveguide for launching said signal therein, and a transmission line portion, having a first section con-toured to the inside surface of the circular wall, and sub-stantially parallel to the axis, of the circular waveguide, and having a second section contoured to the inside surface, and substantially parallel to the plane, of the rear wall of the circular waveguide, for connecting the receiver probe portion to the launch probe portion.
Description of the Drawing Figure 1 is a cross-sectional view of a prior art waveguide assembly with an internal rotating signal detector.
Figure 2 is a cross-sectional view of a waveguide assembly with internal rotating signal detector constructed according to the principles of the present invention.
Figure 3 is a cross-sectional view of the wave-- guide assembly and internal rotating signal detector of Figure 2 further including a feed horn.
-2a-lltj'~13~
Description of the Preferred Embodiment Referring first to Figure 1, prior art mechanical internal rotating signal receivers provided low impedence coaxial transmission line through the back of the circular waveguide at 6 to LP portion 7. However, RP portion 5 of transmission line 4 presents an incorrect impedence to the incident signal, because the energy is coupled from the high impedence end of RP portion 5 by transmission line portion 9 and the low impedence end of RP portion 5 is open circuited.
Thus, the transmission line and RP portion impedences present in this configuration are reversed for effective detection of an incident wave.
Referring now to Figure 2, one embodiment of the present invention comprises circular waveguide 10 perpendicu-larly coupled to rectangular waveguide 22 and including signal conductor 12 fixedly mounted in insulator 20. Signal conductor 12 includes RP portion 13 oriented orthogonal to the axis of symmetry of circular waveguide 10, LP portion 18 extending into, and orthogonal to the axis of, waveguide 22, and coupled to RP portion 13 by conductor portions 16.
Signal conductor 12 is typically constructed of a single, continuous homogenous electrical conductor wherein RP portion 13 is approximately one-quarter wavelength long and transmission line portions 16 form a transmission line in the same manner that any single wire above a ground plane becomes a transmission line. The portion of signal conductor 12, extending through the rear wall of round waveguide 10 at 6, forms a low impedence coaxial transmission line. LP portion 18 launches the detected signal into rectangular waveguide 22.
13v Insulator 20, constructed of polystyrene or other suitable dielectric rod, provides mounting for signal con-ductor 12, electrical insulation of the line from the walls of waveguides 10 and 22, and for selective rotation of signal conductor 12 about its axis of symmetry. Since signal conductor 12 is concentric with axis of rotation of insulator 20, rotation of insulator 20 about its axis rotates LP portion 18, which correspondingly rotates RP
portion 13 orthogonally about the axis of symmetry of wave-guide 10. RP portion 13 is thereby oriented to the polarityof the desired incident signal for detection.
The preferred embodiment of the present invention is shown in Figure 3. In this configuration, circular waveguide 10 is coaxially coupled to feed horn 8 at one end and perpendicularly coupled to rectangular waveguide 22 at the other end. As in the configuration of Figure 3, signa; conductor 12 is coupled to insulator 20, which is coupled to servo motor 17 for posltioning. ;,ervo motor 17 is usually the same as or similar to servc motors,used in remotely controlled model aircraft for control surface movement. Obviously, with the addition of servo motor 17, operation of the detector system may be remotely con-trolled from the operator's control panel. Feed horn 8 may be of the type described in Canadian Patent Application Serial No. 405,814, filed June 23, 1982.
The direction of signals transmitted in waveguide 22 is orthogonal to the direction of signals transmitted in lL~i~13~) waveguide 10. This configuration facili-tates the simplicity of the present invention, since launching of signals into waveguide 22 is insensitive to rotation of LP portion 18, which rotation directly results from rotation of RP portion 13 necessary to select the desired signal.
LP portion 18 is capable of launching the detected signal into another waveguide of any shape or into coaxial cable transmission line. Thus, as the transmission line 12 rotates, RP portion 13 rotates orthogonally to, and LP portion 18 rotates concentrically with the axis of symmetry of the round waveguide. As the RP portion aligns with the desired linearly polarized signal present in the circular waveguide, the signal is detected and conducted along the transmission line to the LP portion, which launches the detected signal.
As stated earlier in this specification, the launched signal or the signal received at the LNA (not shown) is unaffected by the orientation of RP portion 13 because LP portion 18 rotates about its axis of symmetry and such rotation retains 19 the relative position of LP portion 18 with waveguide 22.
POLARIZED SIGNAL RECEIVER SYSTEM
Background and Summary of the Invention In satellite retransmission of communication signals, two linearly polarized signals, rot~ted 90 de~rees from each other, are used. In less expensive installations for receiving such signals, the feed horn for the receiving system is installed with the orientation parallel to the desired signal polarization. The other polarization is not detected and is simply reflected back out of the feed horn. For more expensive installations, the entire feed horn and low noise amplifier system is mounted on a rotator similar to the type used on home television antennas to select the desired signal polarization.
While the above-mentioned systems are cost effect-ive, they are mechanically cumbersome and limit system performance. Other prior art signal polarization rotators electrically rotate the signal field in a ferrite media.
While such rotators eliminate the mechanical clumsiness of the above-descrlbed rotators, they are expensive and introduce addltional signal losses (approximate 0.2 DB) int:o the receiving system. See, for example, such an elec-tr~nic antennae rotator marked by Luly Telecommunications Corp., P.O. Box 2311, San Bernardino, CA., and called a LULY (trade mark) polarizer by that company.
The present invention eliminates the mechanical disadvantages of several prior art rotators and eliminates signal losses associated with other prior art rotators. A
signal detector constructed according to the principles of the present invention comprises a transmission line having a signal receiver probe portion ("RP portion") and a signal launch probe portion ("LP portion") mounted in dielectric rod at the one end of a circular waveguide and a rectangular wave-guide perpendicularly coupled to the circular waveguide. The ~7' ,2" ~.
llti'1130 RP portion of the transmission line detects polarized incoming signals in the circular waveguide and the LP
portion launches the detected signal into the rectangular waveguide for transmission to a low noise amplifier ("LNA").
In the preferred embodiment, the transmission line, by its coupling to the insulator rod, may be rotated continuously and selectively by a servo motor mounted on the waveguide assembly. As the RP portion rotates to receive the desired signal, the LP portion also rotates.
However, the launched signal or the signal received at the LNA is unaffected because rotation of the LP portion is about its axis of symmetry in the rectangular wave-guide. The RP portion in the circular waveguide rotates between the two orthogonally polarized signals impinging on the feed horn. By rotation to the desired polariza-tion, that signal is received and the other reflected.
The selected signal is then conducted along the trans-mission line to the rear wall of the circular waveguide portion of the feed horn and is launched into the rectan-0 gular waveguide by the LP portion~An aspect of the invention is as follows:
A polarized signal receiver comprising:
a first waveguide for transmitting polarized signals;
a circular waveguide for receiving polarized signals at one end and coupled to the first waveguide at the other end, said other end having a rear wall;
an insulator rod, rotatably mounted through said other end of the circular waveguide; and signal conducting means, fixedly mounted in the insu-0 lator rod concentric with the axis of rotation thereof having 1 1~ 3() a receiver probe portion oriented in the circular waveguideorthogonal to the axis of said circular waveguide for receiving one polarization of the incident signal, a launch probe portion concentric with the insulator rod and extending into the first waveguide for launching said signal therein, and a transmission line portion, having a first section con-toured to the inside surface of the circular wall, and sub-stantially parallel to the axis, of the circular waveguide, and having a second section contoured to the inside surface, and substantially parallel to the plane, of the rear wall of the circular waveguide, for connecting the receiver probe portion to the launch probe portion.
Description of the Drawing Figure 1 is a cross-sectional view of a prior art waveguide assembly with an internal rotating signal detector.
Figure 2 is a cross-sectional view of a waveguide assembly with internal rotating signal detector constructed according to the principles of the present invention.
Figure 3 is a cross-sectional view of the wave-- guide assembly and internal rotating signal detector of Figure 2 further including a feed horn.
-2a-lltj'~13~
Description of the Preferred Embodiment Referring first to Figure 1, prior art mechanical internal rotating signal receivers provided low impedence coaxial transmission line through the back of the circular waveguide at 6 to LP portion 7. However, RP portion 5 of transmission line 4 presents an incorrect impedence to the incident signal, because the energy is coupled from the high impedence end of RP portion 5 by transmission line portion 9 and the low impedence end of RP portion 5 is open circuited.
Thus, the transmission line and RP portion impedences present in this configuration are reversed for effective detection of an incident wave.
Referring now to Figure 2, one embodiment of the present invention comprises circular waveguide 10 perpendicu-larly coupled to rectangular waveguide 22 and including signal conductor 12 fixedly mounted in insulator 20. Signal conductor 12 includes RP portion 13 oriented orthogonal to the axis of symmetry of circular waveguide 10, LP portion 18 extending into, and orthogonal to the axis of, waveguide 22, and coupled to RP portion 13 by conductor portions 16.
Signal conductor 12 is typically constructed of a single, continuous homogenous electrical conductor wherein RP portion 13 is approximately one-quarter wavelength long and transmission line portions 16 form a transmission line in the same manner that any single wire above a ground plane becomes a transmission line. The portion of signal conductor 12, extending through the rear wall of round waveguide 10 at 6, forms a low impedence coaxial transmission line. LP portion 18 launches the detected signal into rectangular waveguide 22.
13v Insulator 20, constructed of polystyrene or other suitable dielectric rod, provides mounting for signal con-ductor 12, electrical insulation of the line from the walls of waveguides 10 and 22, and for selective rotation of signal conductor 12 about its axis of symmetry. Since signal conductor 12 is concentric with axis of rotation of insulator 20, rotation of insulator 20 about its axis rotates LP portion 18, which correspondingly rotates RP
portion 13 orthogonally about the axis of symmetry of wave-guide 10. RP portion 13 is thereby oriented to the polarityof the desired incident signal for detection.
The preferred embodiment of the present invention is shown in Figure 3. In this configuration, circular waveguide 10 is coaxially coupled to feed horn 8 at one end and perpendicularly coupled to rectangular waveguide 22 at the other end. As in the configuration of Figure 3, signa; conductor 12 is coupled to insulator 20, which is coupled to servo motor 17 for posltioning. ;,ervo motor 17 is usually the same as or similar to servc motors,used in remotely controlled model aircraft for control surface movement. Obviously, with the addition of servo motor 17, operation of the detector system may be remotely con-trolled from the operator's control panel. Feed horn 8 may be of the type described in Canadian Patent Application Serial No. 405,814, filed June 23, 1982.
The direction of signals transmitted in waveguide 22 is orthogonal to the direction of signals transmitted in lL~i~13~) waveguide 10. This configuration facili-tates the simplicity of the present invention, since launching of signals into waveguide 22 is insensitive to rotation of LP portion 18, which rotation directly results from rotation of RP portion 13 necessary to select the desired signal.
LP portion 18 is capable of launching the detected signal into another waveguide of any shape or into coaxial cable transmission line. Thus, as the transmission line 12 rotates, RP portion 13 rotates orthogonally to, and LP portion 18 rotates concentrically with the axis of symmetry of the round waveguide. As the RP portion aligns with the desired linearly polarized signal present in the circular waveguide, the signal is detected and conducted along the transmission line to the LP portion, which launches the detected signal.
As stated earlier in this specification, the launched signal or the signal received at the LNA (not shown) is unaffected by the orientation of RP portion 13 because LP portion 18 rotates about its axis of symmetry and such rotation retains 19 the relative position of LP portion 18 with waveguide 22.
Claims (15)
1. A polarized signal receiver comprising:
a first waveguide for transmitting polarized signals;
a circular waveguide for receiving polarized signals at one end and coupled to the first waveguide at the other end, said other end having a rear wall;
an insulator rod, rotatably mounted through said other end of the circular waveguide; and signal conducting means, fixedly mounted in the insu-lator rod concentric with the axis of rotation thereof having a receiver probe portion oriented in the circular waveguide orthogonal to the axis of said circular waveguide for receiving one polarization of the incident signal, a launch probe portion concentric with the insulator rod and extending into the first waveguide for launching said signal therein, and a transmission line portion, having a first section con-toured to the inside surface of the circular wall, and sub-stantially parallel to the axis, of the circular waveguide, and having a second section contoured to the inside surface, and substantially parallel to the plane, of the rear wall of the circular waveguide, for connecting the receiver probe portion to the launch probe portion.
a first waveguide for transmitting polarized signals;
a circular waveguide for receiving polarized signals at one end and coupled to the first waveguide at the other end, said other end having a rear wall;
an insulator rod, rotatably mounted through said other end of the circular waveguide; and signal conducting means, fixedly mounted in the insu-lator rod concentric with the axis of rotation thereof having a receiver probe portion oriented in the circular waveguide orthogonal to the axis of said circular waveguide for receiving one polarization of the incident signal, a launch probe portion concentric with the insulator rod and extending into the first waveguide for launching said signal therein, and a transmission line portion, having a first section con-toured to the inside surface of the circular wall, and sub-stantially parallel to the axis, of the circular waveguide, and having a second section contoured to the inside surface, and substantially parallel to the plane, of the rear wall of the circular waveguide, for connecting the receiver probe portion to the launch probe portion.
2. A polarized signal receiver as in claim 1 further including a feed horn for receiving incident polarized signals, coaxially coupled to said one end of the circular waveguide.
3. A polarized signal receiver as in claim 1 further including remotely controllable motor means coupled to the insulator rod for selectively rotating the signal conduct-ing means mounted therein.
4. A polarized signal receiver as in claim 1 or 2 wherein the inside surfaces of the rear and circular walls of the circular waveguide form waveguide walls and the ground plane element of the transmission line portion.
5. A polarized signal receiver as in claim 1 or 2 wherein the launch probe is orthogonal to the direction of signal transmission in the first waveguide.
6. A polarized signal receiver as in claim 1 or 2 wherein the first waveguide is a rectangular waveguide.
7. A polarized signal receiver as in claim 1 or 2 wherein the first waveguide is a circular waveguide.
8. A polarized signal receiver as in claim 1 or 2 wherein the first waveguide is a square waveguide.
9. A polarized signal receiver as in claim 1 or 2 wherein the first waveguide is an elliptical waveguide.
10. A polarized signal receiver as in claim 1 or 2 wherein the signal conducting means is a single continuous electrical conductor.
11. A polarized signal receiver as in claim 1 or 3 wherein the receiver probe portion is approximately one-quarter wavelength long.
12. A polarized signal receiver as in claim 1 or 3 wherein the signal conducting means is selectably rotatable to orient the receiver probe for receiving different polarizations of incident signals.
13, A polarized signal receiver as in claim 1 or 3 wherein the signal conducting means is selectably rotatable to orient the receiver probe for receiving different polari-zations of incident signals and wherein the impedance of the launch probe and transmission line portions is substantially unaffected by the orientation of the receiver probe portion around the axis of the circular waveguide.
14. A polarized signal receiver as in claim 1 wherein the first and second sections of the transmission line portion and the launch probe portion all have substantially uniform impedance at the frequency of the signal received.
15. A polarized signal receiver as in claim 1 wherein said first section of the transmission line portion is gen-erally parallel to the axis and near the surface of the circular wall of the circular waveguide, and said second section of the transmission line portion is generally parallel to the plane, and near the surface, of the rear wall of the circular waveguide, said circular waveguide walls forming the ground plane of said transmission line portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US322,446 | 1981-11-18 | ||
| US06/322,446 US4414516A (en) | 1981-11-18 | 1981-11-18 | Polarized signal receiver system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1169130A true CA1169130A (en) | 1984-06-12 |
Family
ID=23254934
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000405815A Expired CA1169130A (en) | 1981-11-18 | 1982-06-23 | Polarized signal receiver system |
| CA000569136A Expired CA1256517B (en) | 1981-11-18 | 1988-06-09 | Polarized signal receiver system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000569136A Expired CA1256517B (en) | 1981-11-18 | 1988-06-09 | Polarized signal receiver system |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4414516A (en) |
| CA (2) | CA1169130A (en) |
Families Citing this family (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4965825A (en) | 1981-11-03 | 1990-10-23 | The Personalized Mass Media Corporation | Signal processing apparatus and methods |
| USRE47642E1 (en) | 1981-11-03 | 2019-10-08 | Personalized Media Communications LLC | Signal processing apparatus and methods |
| US7831204B1 (en) | 1981-11-03 | 2010-11-09 | Personalized Media Communications, Llc | Signal processing apparatus and methods |
| US4544900A (en) * | 1981-11-18 | 1985-10-01 | Chaparral Communications, Inc. | Polarized signal receiver system |
| US4528528A (en) * | 1982-04-02 | 1985-07-09 | Boman Industries | Waveguide polarization coupling |
| US4504836A (en) * | 1982-06-01 | 1985-03-12 | Seavey Engineering Associates, Inc. | Antenna feeding with selectively controlled polarization |
| US4801946A (en) * | 1983-01-26 | 1989-01-31 | Mark Antenna Products, Inc. | Grid antenna |
| US4663634A (en) * | 1983-11-21 | 1987-05-05 | Epsco, Incorporated | Polarization converter within waveguide feed for dish reflector |
| US4554553A (en) * | 1984-06-15 | 1985-11-19 | Fay Grim | Polarized signal receiver probe |
| US4755828A (en) * | 1984-06-15 | 1988-07-05 | Fay Grim | Polarized signal receiver waveguides and probe |
| US4758841A (en) * | 1984-06-15 | 1988-07-19 | Fay Grim | Polarized signal receiver probe |
| US4574258A (en) * | 1984-08-27 | 1986-03-04 | M/A-Com, Inc. | Polarized signal receiving apparatus |
| FR2583597A1 (en) * | 1985-06-13 | 1986-12-19 | Alcatel Thomson Faisceaux | HYPERFREQUENCY PASSPORT FILTER IN EVANESCENT MODE |
| JPH0666707B2 (en) | 1985-10-21 | 1994-08-24 | ソニー株式会社 | Receiving machine |
| US4686491A (en) * | 1985-10-22 | 1987-08-11 | Chaparral Communications | Dual probe signal receiver |
| JPS6297401A (en) * | 1985-10-24 | 1987-05-06 | Shimada Phys & Chem Ind Co Ltd | Waveguide type linearly polarized wave changeover equipment |
| US4613836A (en) * | 1985-11-12 | 1986-09-23 | Westinghouse Electric Corp. | Device for switching between linear and circular polarization using rotation in an axis across a square waveguide |
| CA1262773A (en) * | 1985-12-25 | 1989-11-07 | Mitsuhiro Kusano | Horn antenna with a choke surface-wave structure on the outer surface thereof |
| US4734660A (en) * | 1986-05-23 | 1988-03-29 | Northern Satellite Corporation | Signal polarization rotator |
| US4740795A (en) * | 1986-05-28 | 1988-04-26 | Seavey Engineering Associates, Inc. | Dual frequency antenna feeding with coincident phase centers |
| US4821046A (en) * | 1986-08-21 | 1989-04-11 | Wilkes Brian J | Dual band feed system |
| US4885593A (en) * | 1986-09-18 | 1989-12-05 | Scientific-Atlanta, Inc. | Feeds for compact ranges |
| DE8628689U1 (en) * | 1986-10-28 | 1987-07-02 | Wirtschaftliche Satellitenempfangssysteme Gmbh, 6720 Speyer, De | |
| US4841261A (en) * | 1987-09-01 | 1989-06-20 | Augustin Eugene P | Microwave rotary junction with external rotary energy coupling |
| US5255003B1 (en) * | 1987-10-02 | 1995-05-16 | Antenna Downlink Inc | Multiple-frequency microwave feed assembly |
| US5109232A (en) * | 1990-02-20 | 1992-04-28 | Andrew Corporation | Dual frequency antenna feed with apertured channel |
| US5245353A (en) * | 1991-09-27 | 1993-09-14 | Gould Harry J | Dual waveguide probes extending through back wall |
| US5461394A (en) * | 1992-02-24 | 1995-10-24 | Chaparral Communications Inc. | Dual band signal receiver |
| US5463358A (en) * | 1993-09-21 | 1995-10-31 | Dunn; Daniel S. | Multiple channel microwave rotary polarizer |
| ITVI20050340A1 (en) * | 2005-12-20 | 2007-06-21 | Tekno System Spa | PROTECTIVE HOUSING FOR CAMERAS |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2548821A (en) * | 1946-04-30 | 1951-04-10 | Henry J Riblet | Horn radiator adapted to be fed by a coaxial line |
| US2742612A (en) * | 1950-10-24 | 1956-04-17 | Sperry Rand Corp | Mode transformer |
| US2880399A (en) * | 1952-10-20 | 1959-03-31 | Sperry Rand Corp | Amplitude modulator for microwaves |
| US3681714A (en) * | 1969-03-06 | 1972-08-01 | Tokyo Keiki Seizosho Co Ltd | Impedance transformers for microwave transmission lines |
| US4168504A (en) * | 1978-01-27 | 1979-09-18 | E-Systems, Inc. | Multimode dual frequency antenna feed horn |
-
1981
- 1981-11-18 US US06/322,446 patent/US4414516A/en not_active Ceased
-
1982
- 1982-06-23 CA CA000405815A patent/CA1169130A/en not_active Expired
-
1988
- 1988-06-09 CA CA000569136A patent/CA1256517B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4414516A (en) | 1983-11-08 |
| CA1256517B (en) | 1989-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1169130A (en) | Polarized signal receiver system | |
| CA1197613A (en) | Antenna feeding with selectively controlled polarization | |
| CA2202843C (en) | Feeder link antenna | |
| US4978965A (en) | Broadband dual-polarized frameless radiating element | |
| EP0543509B1 (en) | Polarization agility in an RF radiator module for use in a phased array | |
| US5066958A (en) | Dual frequency coaxial feed assembly | |
| US5041840A (en) | Multiple frequency antenna feed | |
| CA1270557A (en) | Dual frequency antenna feeding | |
| US4903037A (en) | Dual frequency microwave feed assembly | |
| US3922683A (en) | Three frequency band antenna | |
| CA1250045A (en) | Microwave plane antenna | |
| US4821046A (en) | Dual band feed system | |
| US4544900A (en) | Polarized signal receiver system | |
| CA1110722A (en) | Feeder arrangement for an aerial for inter alia satellite signals | |
| WO1992022938A1 (en) | Dual polarisation waveguide probe system | |
| EP0458226B1 (en) | Orthomode transducer between a circular waveguide and a coaxial cable | |
| USRE32835E (en) | Polarized signal receiver system | |
| CA1236892A (en) | Polarized signal receiver probe | |
| EP0518615B1 (en) | Wave guide to microstrip line mode transition apparatus | |
| US5440279A (en) | Electromagnetic radiation converter | |
| US3815136A (en) | Coaxial tracking signal coupler for antenna feed horn | |
| US5103237A (en) | Dual band signal receiver | |
| US3019438A (en) | Antenna structure | |
| US4503379A (en) | Rotation of microwave signal polarization using a twistable, serpentine-shaped filament | |
| US4590479A (en) | Broadcast antenna system with high power aural/visual self-diplexing capability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MZSU | Surrender |