CA2061743C - End loaded helix antenna - Google Patents
End loaded helix antennaInfo
- Publication number
- CA2061743C CA2061743C CA002061743A CA2061743A CA2061743C CA 2061743 C CA2061743 C CA 2061743C CA 002061743 A CA002061743 A CA 002061743A CA 2061743 A CA2061743 A CA 2061743A CA 2061743 C CA2061743 C CA 2061743C
- Authority
- CA
- Canada
- Prior art keywords
- ground plane
- antenna element
- conductive
- post
- antenna
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
Abstract
A device is provided for use in a helical antenna having an antenna element wound about the periphery of a dielectric support post, the post being in the form of a tube or cylinder. The device has an electrically conductive member electrically connected to one end of said antenna element. The conductive member is of any appropriate shape or configuration and is operable to increase the loading on the antenna whereby standing waves on the antenna element are reduced and a more uniform electrical current is produced along the antenna element.
Description
~ 1 2061743 `~- END LOADED Hh.-. x ANTENNA
FIELD OF THE INVENI~ON
This invention relates to a helical ~ntenn~ and in particular to a device for illl~iOvil~g pe, rO.. ~-ce while redu~ the size of col,Yenlional helical ~ntenn~
BACKGROUND OF THE INVENTION
The increase in dem~n(l for mobile co...,..~..ication devices and in particular ae~ol.aulical s~te!lite co.. ~,-ic~ti~n devices, which may be installed on light air~larl, has required that these devices become smaller. One of the larger co~ ollents in these devices is the ~-le.~n~ ~ntenn~ used for this type of co..~ lwllication are often large diameter helical antennas. The installation of these devices on light airwarl has thus created a need for smaller ~ntenn~ and lower wind resisl~ce. Further desirable qualities of a helix antenna for mobile co~unications devices would be reduced axial ratio, i~ loved gain, wide bandwidth and red~lced l~e~width.
Convelllional helical ~ntenn~ having the required gain, beam width and axial ratio pelrollJlance would not fit into the space allotted within a radome of an aircraft or similar restricted space. It is also known to i~llprove the gain of a helix ~ntenn~ by tapering the helix pitch along the length of the ~ntenn~ in theaxial direction. This also provides reduced beam width.
SUMMARY OF THE INVENTION
The present invention seeks to provide a simple and economical method and appalalus which increases the gain, reduces the beam width, reduces the r length and ill-~l.)VCS the axial ratio l,elro- .. ~-re and the bandwidth of collvelllional helical antennas. In ~-l(lition the device and method of the present invention may be used with all types of helix antennas inch1~1ing tapered diameter, tapered pitch, monQfil~r and mlll~fil~r type ~ntenn~c.
In accordance with the present invention there is provided a device for use in a helical antenna having an antenna element wound about the periphery of a hollow dielectric su~oll post, the post being in the form of a tube or cylinder and extending from a ground plane and generally normal to the ground plane, the ~L
-~_ - 2 -r(~ ent C~
an electrically cQnductive member electric~lly connected to one end of the ~ntenn~ element; the oQnductive member being of any a~pr~l,ate shape or cQn~-ration and operable to increase the lo~line on the ~ntenn~ whereby S st~n~line waves on the ~ntenn~ element are reduce~ and a more uni~o,m electrical ,enl is prod~ced along the ~ntenn~ element.
BRIEF DESCRImON OF THE DR~WINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings wherein:
FIGURE 1 shows the structure of a u~ifolll- diameter helical antenna having an end cap accor-lmg to the present invention;
FIGURE 2 is a top view of the end cap of Figure l;
FIGURE 3 is a section~l view of a further embo~liment of an end cap accord ng to the present invention;
FIGURE 4 is a sectional view of a further embodiment of the end cap according to the present invention;
FIGURE S shows a lumped c~p~ritQr in accordance with the present invention;
FIGURE 6 shows a further embodiment of a u~iro~ diameter decreasing pitch helical ~ntenn~
FIGURE 7 is a plot of gain versus angle of elevation for an antenna accordmg to the present invention; and FIGURE 8 is a plot of gain versus angle of elevation for a prior art ~nt~nn~
DESCRIPTION OF PREFERRED EMBODIMENT
Referring to Figure 1 a ~ irO.lll diameter helical antenna is shown generally by numeral 1. The ~nte~n~ 1 has a circular ground plane 2 to which is ~tt~hed a ~3ielectric tube or cylinder 4. The dielectric tube 4 eytentlc in a direction normal to the plane of the ground plane 2. The ground plane 2 in turn has an u~wardly depen~line skirt 3 ~ullolJ~ its perimeter. An antenna elçment or winding C ic wound about the tube or cylinder 4. The winding 6 extends along the surface of the cylinder from its feedpoint S at the ground plane
FIELD OF THE INVENI~ON
This invention relates to a helical ~ntenn~ and in particular to a device for illl~iOvil~g pe, rO.. ~-ce while redu~ the size of col,Yenlional helical ~ntenn~
BACKGROUND OF THE INVENTION
The increase in dem~n(l for mobile co...,..~..ication devices and in particular ae~ol.aulical s~te!lite co.. ~,-ic~ti~n devices, which may be installed on light air~larl, has required that these devices become smaller. One of the larger co~ ollents in these devices is the ~-le.~n~ ~ntenn~ used for this type of co..~ lwllication are often large diameter helical antennas. The installation of these devices on light airwarl has thus created a need for smaller ~ntenn~ and lower wind resisl~ce. Further desirable qualities of a helix antenna for mobile co~unications devices would be reduced axial ratio, i~ loved gain, wide bandwidth and red~lced l~e~width.
Convelllional helical ~ntenn~ having the required gain, beam width and axial ratio pelrollJlance would not fit into the space allotted within a radome of an aircraft or similar restricted space. It is also known to i~llprove the gain of a helix ~ntenn~ by tapering the helix pitch along the length of the ~ntenn~ in theaxial direction. This also provides reduced beam width.
SUMMARY OF THE INVENTION
The present invention seeks to provide a simple and economical method and appalalus which increases the gain, reduces the beam width, reduces the r length and ill-~l.)VCS the axial ratio l,elro- .. ~-re and the bandwidth of collvelllional helical antennas. In ~-l(lition the device and method of the present invention may be used with all types of helix antennas inch1~1ing tapered diameter, tapered pitch, monQfil~r and mlll~fil~r type ~ntenn~c.
In accordance with the present invention there is provided a device for use in a helical antenna having an antenna element wound about the periphery of a hollow dielectric su~oll post, the post being in the form of a tube or cylinder and extending from a ground plane and generally normal to the ground plane, the ~L
-~_ - 2 -r(~ ent C~
an electrically cQnductive member electric~lly connected to one end of the ~ntenn~ element; the oQnductive member being of any a~pr~l,ate shape or cQn~-ration and operable to increase the lo~line on the ~ntenn~ whereby S st~n~line waves on the ~ntenn~ element are reduce~ and a more uni~o,m electrical ,enl is prod~ced along the ~ntenn~ element.
BRIEF DESCRImON OF THE DR~WINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings wherein:
FIGURE 1 shows the structure of a u~ifolll- diameter helical antenna having an end cap accor-lmg to the present invention;
FIGURE 2 is a top view of the end cap of Figure l;
FIGURE 3 is a section~l view of a further embo~liment of an end cap accord ng to the present invention;
FIGURE 4 is a sectional view of a further embodiment of the end cap according to the present invention;
FIGURE S shows a lumped c~p~ritQr in accordance with the present invention;
FIGURE 6 shows a further embodiment of a u~iro~ diameter decreasing pitch helical ~ntenn~
FIGURE 7 is a plot of gain versus angle of elevation for an antenna accordmg to the present invention; and FIGURE 8 is a plot of gain versus angle of elevation for a prior art ~nt~nn~
DESCRIPTION OF PREFERRED EMBODIMENT
Referring to Figure 1 a ~ irO.lll diameter helical antenna is shown generally by numeral 1. The ~nte~n~ 1 has a circular ground plane 2 to which is ~tt~hed a ~3ielectric tube or cylinder 4. The dielectric tube 4 eytentlc in a direction normal to the plane of the ground plane 2. The ground plane 2 in turn has an u~wardly depen~line skirt 3 ~ullolJ~ its perimeter. An antenna elçment or winding C ic wound about the tube or cylinder 4. The winding 6 extends along the surface of the cylinder from its feedpoint S at the ground plane
2 to an end 8 remote thereo The cylinder 4 has, at its end remote from the ground plane 2, a flat surface de-fining a plane parallel to the ground plane 2. A
condllctive cap 10 is ?tt~rhed to this surface at the remote end of the cylinder 4 and the free end 8 of the ~ntenn~ elem~-nt 6 is electrically connected by an ohmic contact to the cond~letive cap 10. The end of the ?ntenn~ element 6 at the ground plane is connected to a suitable feed connçctor 12 which is icolate~l from the ground plane 2.
Referring to Figure 2, the top view of the cap is shown in which the cap 10 coluplises a metallic or any swtable cond~lctive material ~nnnl~r plate. The diameter of the ~nml1~r plate cap 10 it does not nececs~-ily have to correspond with the inner diameter of the dielectric cylinder 4. The thickness of the cap, on a prototype ~ntenn~ was Q.02 inches, however, it was found that the thickness has little impact on pelÇol..l~ce of the ~ntenn~
The cap 10 and the ground plane 2 form a c~pacitQr C, the c~pat it~nce of which may be e~essed;
C=~A
x (1) Where e is the ~e. ,l~ r and A is the cross-sectional area of the cap.
This interaction between the cap 10 and the ground plane 2 results in cullenl flow at the remote end 8 of the helix wil~dil g, thus suppressing st~n~ing waves which otherwise exist on the heli~L This increases the bandwidth, since the structure is now more travelling wave in nature and less reso..~ Since the ~.urelll is now more uniform on the helix, the helix aperhlre is more uniformly illnminated thusresllltir~ in ll~lower bealllwidth and higher gain. Uni~o~ c~ ellt also i~ "ovesthe axial ratio.
Typical rlim~.ncionc for the ~ntenn~ described in the embodiments of Figures 1 and 2 are as follow:
length of the cylinder 4: l = 21.8 cm (li~meter of the cylinder 4: d = 5.5 cm wall thickness of the cylinder 4: t = 0.14 cm width of the win~lin~,c w~ = 0.6 cm meter of ground plane: D = 9.5 cm thickness of ground plane: w = 0.12 cm height of ground plane skirt: H = 2.73 cm The separation between centres of the winding at the feedpoint end is 18 mm and the separation at the remote end 8 is 10 mm. It is also important that the feedpoint 11 of the windin~c and the free end 8 of the wintlin~c are ~lignedalong a plane through the central a~s of the cylinder 4. The width wl of the winding 6 may be varied, however, it is norm~lly con.ct~nt The winding 6 may be bonded or etched on to the cylinder 4.
The helical ~nte-nn~ as shown in Figures 1 and 2 has a performance indicated by the gain versus elevation plot of figure 7.
By colllrasl the pe~ro~ re of a ~llvcelll;on~l luniro~ diameter helLx antenna without a conductive disk may be seen from a gain versus elevation plot of figure 8.
Turning now to figure 3, a cross section~l view of an alternative embo~liment of the conductive cap 10 is shown, along the line A-A of Figure 2 .
The conductive cap 20 shown in Figure 3 may be termed a s~mken cap in that the cap 20 is concavely shaped with an inner central region projecting within the dielectric tube 4. The remote end 8 of the antenna element is electrically connected to the cap 20 as in the embodiment of Figure 1.
Figure 4 indicates a cond~ct*e post 28 which extends from the ground plane 2. The conductive post 28 is electrically connected at one end to the ground plane 2 and eYten~l~ within the dielectric tube 4. The free end of the conductive post 28 is in ~ro~ ily to the conductive cap 10 but is not in electrical `- 206 1 743 - S -cont~çt with the cap 10. The cQnductive tNbe 28 may also be used in conjunction with the snnken cap 20 of Figure 3.
Referring to Figure 5, the conduçtive post 28 as intli~ted in Figure 4, is employed in ~dition to a lumped c~p~citor element 30 is connected from S conductive cap 10 to the free end of cQnductive post 28.
Referring to Figure 6, a ~ifo,~ meter helix ~ntenna is indicated as in Figure 1 ho..~cr the pitch of the ~ntenn~ element decreases as the ~ntenn~
elem~-nt proglesses from the ground plane 2 to the end 8 remote from the ground plane 2. A conductive cap 30 is also indicated as in Figure 1 to which the free end of the element 8 is ol mic~lly cQnnecte(l The conductive cap 30 is however cone shaped.
It has been further found that the skirt 3 allows the diameter of the ground plane 2 to be reduced and it also increases the winding to ground plane c~p~it~nçe while reducin~ bn~lobe and sidelobe energy.
While the invention has been described in connection with a specific embodiment thereof and in a specific use, various modifications thereof will occur to those sldlled in the art without departing from the spirit and scope of the invention as set forth in the appended claims.
The terms and e~iessions which have been employed in the specification are used as terms of description and not of limit~tions, and there is no intention in the use of such terms and eAl,~essions to eY~lude any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the claims to the invention.
condllctive cap 10 is ?tt~rhed to this surface at the remote end of the cylinder 4 and the free end 8 of the ~ntenn~ elem~-nt 6 is electrically connected by an ohmic contact to the cond~letive cap 10. The end of the ?ntenn~ element 6 at the ground plane is connected to a suitable feed connçctor 12 which is icolate~l from the ground plane 2.
Referring to Figure 2, the top view of the cap is shown in which the cap 10 coluplises a metallic or any swtable cond~lctive material ~nnnl~r plate. The diameter of the ~nml1~r plate cap 10 it does not nececs~-ily have to correspond with the inner diameter of the dielectric cylinder 4. The thickness of the cap, on a prototype ~ntenn~ was Q.02 inches, however, it was found that the thickness has little impact on pelÇol..l~ce of the ~ntenn~
The cap 10 and the ground plane 2 form a c~pacitQr C, the c~pat it~nce of which may be e~essed;
C=~A
x (1) Where e is the ~e. ,l~ r and A is the cross-sectional area of the cap.
This interaction between the cap 10 and the ground plane 2 results in cullenl flow at the remote end 8 of the helix wil~dil g, thus suppressing st~n~ing waves which otherwise exist on the heli~L This increases the bandwidth, since the structure is now more travelling wave in nature and less reso..~ Since the ~.urelll is now more uniform on the helix, the helix aperhlre is more uniformly illnminated thusresllltir~ in ll~lower bealllwidth and higher gain. Uni~o~ c~ ellt also i~ "ovesthe axial ratio.
Typical rlim~.ncionc for the ~ntenn~ described in the embodiments of Figures 1 and 2 are as follow:
length of the cylinder 4: l = 21.8 cm (li~meter of the cylinder 4: d = 5.5 cm wall thickness of the cylinder 4: t = 0.14 cm width of the win~lin~,c w~ = 0.6 cm meter of ground plane: D = 9.5 cm thickness of ground plane: w = 0.12 cm height of ground plane skirt: H = 2.73 cm The separation between centres of the winding at the feedpoint end is 18 mm and the separation at the remote end 8 is 10 mm. It is also important that the feedpoint 11 of the windin~c and the free end 8 of the wintlin~c are ~lignedalong a plane through the central a~s of the cylinder 4. The width wl of the winding 6 may be varied, however, it is norm~lly con.ct~nt The winding 6 may be bonded or etched on to the cylinder 4.
The helical ~nte-nn~ as shown in Figures 1 and 2 has a performance indicated by the gain versus elevation plot of figure 7.
By colllrasl the pe~ro~ re of a ~llvcelll;on~l luniro~ diameter helLx antenna without a conductive disk may be seen from a gain versus elevation plot of figure 8.
Turning now to figure 3, a cross section~l view of an alternative embo~liment of the conductive cap 10 is shown, along the line A-A of Figure 2 .
The conductive cap 20 shown in Figure 3 may be termed a s~mken cap in that the cap 20 is concavely shaped with an inner central region projecting within the dielectric tube 4. The remote end 8 of the antenna element is electrically connected to the cap 20 as in the embodiment of Figure 1.
Figure 4 indicates a cond~ct*e post 28 which extends from the ground plane 2. The conductive post 28 is electrically connected at one end to the ground plane 2 and eYten~l~ within the dielectric tube 4. The free end of the conductive post 28 is in ~ro~ ily to the conductive cap 10 but is not in electrical `- 206 1 743 - S -cont~çt with the cap 10. The cQnductive tNbe 28 may also be used in conjunction with the snnken cap 20 of Figure 3.
Referring to Figure 5, the conduçtive post 28 as intli~ted in Figure 4, is employed in ~dition to a lumped c~p~citor element 30 is connected from S conductive cap 10 to the free end of cQnductive post 28.
Referring to Figure 6, a ~ifo,~ meter helix ~ntenna is indicated as in Figure 1 ho..~cr the pitch of the ~ntenn~ element decreases as the ~ntenn~
elem~-nt proglesses from the ground plane 2 to the end 8 remote from the ground plane 2. A conductive cap 30 is also indicated as in Figure 1 to which the free end of the element 8 is ol mic~lly cQnnecte(l The conductive cap 30 is however cone shaped.
It has been further found that the skirt 3 allows the diameter of the ground plane 2 to be reduced and it also increases the winding to ground plane c~p~it~nçe while reducin~ bn~lobe and sidelobe energy.
While the invention has been described in connection with a specific embodiment thereof and in a specific use, various modifications thereof will occur to those sldlled in the art without departing from the spirit and scope of the invention as set forth in the appended claims.
The terms and e~iessions which have been employed in the specification are used as terms of description and not of limit~tions, and there is no intention in the use of such terms and eAl,~essions to eY~lude any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the claims to the invention.
Claims (22)
1. In a helical antenna having an antenna element wound about the periphery of a hollow dielectric support post, the post being in the form of a tube or cylinder and extending from a ground plane in a direction generally normal to the ground plane, the improvement comprising:
an electrically conductive member electrically connected to one end of said antenna element; the conductive member being operable to increase the loading on the antenna whereby a current flow is produced at said one end of the antenna element thereby standing waves on the antenna element are reduced.
an electrically conductive member electrically connected to one end of said antenna element; the conductive member being operable to increase the loading on the antenna whereby a current flow is produced at said one end of the antenna element thereby standing waves on the antenna element are reduced.
2. A device as defined in claim 1, said one end of said antenna element being remote from a feed point of said antenna element.
3. A device as defined in claim 1 or 2, said conductive element being a flat circular disc.
4. A device as defined in claim 1 or 2, said conductive element being an flat annular disc.
5. A device as defined in claim 1 or 2, said conductive element being a concavely shaped disc, with a central portion if said disc projecting into said dielectric support post.
6. A device as defined in claim 1 or 2, said conductive element being cone shaped with the apex of said cone projecting away from said ground plane.
7. A device as defined in claim 1 or 2, said conductive member including a conductive post electrically connected to said ground plane and extending substantially normal to said ground plane and within the said hollow dielectric support post, a free end of said conductive post being electrically isolated from said conductive member.
8. A device as defined in claim 7, including a lumped reactive element being electrically connected at one end thereof to said conductive member and being electrically connected at its other end to the free end of saidconductive post.
9. A device as defined in claim 1, said antenna element being tapered in pitch from said ground plane to said one end of said antenna element
10. A device as defined in claim 9, said pitch being tapered from 18 mm at said ground plane to 10 mm at said one end.
11. A device as defined in claim 1, said ground plane being circular and including an skirt member depending upwardly from the perimeter of said ground plane.
12. In a helical antenna having an antenna element wound about the periphery of a hollow dielectric support post, the post being in the form of a tube or cylinder and extending from a ground plane in a direction generally normal to the ground plane, the improvement comprising:
an electrically conductive member electrically connected to one end of said antenna element, said one end of said antenna element being an end opposite a feed point end of said antenna element; the conductive member being operable to increase the loading on the antenna whereby a current flow is produced at said opposite end of the antenna element due to a capacitive coupling between said conductive member and said ground plane thereby reducing standing waves on said antenna element.
an electrically conductive member electrically connected to one end of said antenna element, said one end of said antenna element being an end opposite a feed point end of said antenna element; the conductive member being operable to increase the loading on the antenna whereby a current flow is produced at said opposite end of the antenna element due to a capacitive coupling between said conductive member and said ground plane thereby reducing standing waves on said antenna element.
13. A device as defined in claim 12, said electrical connection between said conductive member and said antenna element being positioned along a longitudinal axis of said dielectric post and passing through said feed point.
14. A device as defined in claim 12, said conductive element being a flat circular disc.
15. A device as defined in claim 12, said conductive element being an flat annular disc.
16. A device as defined in claim 12, said conductive element being a concavely shaped disc, with a central portion if said disc projecting into said dielectric support post.
17. A device as defined in claim 12, said conductive element being cone shaped with the apex of said cone projecting away from said ground plane.
18. A device as defined in claim 12, said conductive member including a conductive post electrically connected to said ground plane and extending substantially normal to said ground plane and within the said hollow dielectric support post, a free end of said conductive post being electrically isolated from said conductive member.
19. A device as defined in claim 18, including a lumped reactive element being electrically connected at one end thereof to said conductive member and being electrically connected at its other end to the free end of saidconductive post.
20. A device as defined in claim 12 said antenna element being tapered in pitch from said ground plane to said one end of said antenna element.
21. A device as define in claim 20, said pitch being tapered from 18 mm at said ground plane to 10 mm at said one end.
22. In a helical antenna having an antenna element wound about the periphery of a hollow dielectric support post, the post being in the form of a tube or cylinder and extending from a ground plane in a direction generally normal to the ground plane, the improvement comprising:
an electrically conductive circular disc member electrically connected to one end of said antenna element, said one end of said antenna element being an end opposite a feed point end of said antenna element; said electrical connection between said disc member and said antenna element being positioned along a longitudinal axis of said dielectric post and passing through said feed point; said ground plane being circular and including an skirt member depending upwardly from the perimeter of said ground plane; said antenna element being tapered in pitch from said ground plane to said one end of said antenna element and said disc member being operable to increase the loading on the antenna whereby a current flow is produced at said opposite end of the antenna element due to a capacitive coupling between said disc member and said ground plane thereby reducing standing waves on said antenna element.
an electrically conductive circular disc member electrically connected to one end of said antenna element, said one end of said antenna element being an end opposite a feed point end of said antenna element; said electrical connection between said disc member and said antenna element being positioned along a longitudinal axis of said dielectric post and passing through said feed point; said ground plane being circular and including an skirt member depending upwardly from the perimeter of said ground plane; said antenna element being tapered in pitch from said ground plane to said one end of said antenna element and said disc member being operable to increase the loading on the antenna whereby a current flow is produced at said opposite end of the antenna element due to a capacitive coupling between said disc member and said ground plane thereby reducing standing waves on said antenna element.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002061743A CA2061743C (en) | 1992-02-24 | 1992-02-24 | End loaded helix antenna |
| US07/893,525 US5329287A (en) | 1992-02-24 | 1992-06-04 | End loaded helix antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002061743A CA2061743C (en) | 1992-02-24 | 1992-02-24 | End loaded helix antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2061743A1 CA2061743A1 (en) | 1993-08-25 |
| CA2061743C true CA2061743C (en) | 1996-05-14 |
Family
ID=4149317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002061743A Expired - Lifetime CA2061743C (en) | 1992-02-24 | 1992-02-24 | End loaded helix antenna |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5329287A (en) |
| CA (1) | CA2061743C (en) |
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| US7614556B2 (en) * | 2004-11-05 | 2009-11-10 | Goliath Solutions, Llc | Distributed RFID antenna array utilizing circular polarized helical antennas |
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| US10374299B1 (en) | 2015-02-06 | 2019-08-06 | First Rf Corporation | Method for making a radiator structure for a helical antenna |
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| US10381737B2 (en) * | 2016-09-15 | 2019-08-13 | Stc.Unm | 3D printed miniaturized quadrifilar helix antenna |
| WO2021001799A1 (en) * | 2019-07-04 | 2021-01-07 | Poynting Antennas (Pty) Limited | Helical antenna |
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| CA845308A (en) * | 1970-06-23 | A. Fredriksson Oke | Helical antenna for irradiating an earth formation penetrated by a borehole and method of forming same | |
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-
1992
- 1992-02-24 CA CA002061743A patent/CA2061743C/en not_active Expired - Lifetime
- 1992-06-04 US US07/893,525 patent/US5329287A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2061743A1 (en) | 1993-08-25 |
| US5329287A (en) | 1994-07-12 |
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| EEER | Examination request | ||
| MKEX | Expiry |