A multi-layered compact slot antenna shortens the physical length of a slot antenna (710) by using more than one conductive layer, separated by a dielectric layer, to create inductor structures (790, 795) within a slot antenna. Adding inductance to a slot antenna allows a physical reduction in slot length...http://www.google.com.au/patents/US5966101?utm_source=gb-gplus-sharePatent US5966101 - Multi-layered compact slot antenna structure and method
