Transmission/reception antenna e.g. planar inverted-F antenna, for GSM and UMTS double mode mobile telephone, has symmetrical switch with two active diodes in flip-flop configuration and capacitor ensuring electric symmetry of switch

摘要

The antenna has a plane radiating surface (2) divided into two radiation zones (51, 52) separated by junctions (41, 42) comprising switches to place in resonance all or part of the surface by connecting electrically all or part of the zones. A symmetrical switch (60) has two active diodes (31, 32) in a flip-flop configuration and a capacitor (63) ensuring the electric symmetry of the switch for the radio frequency currents. Independent claims are also included for the following: (1) a mobile telephone comprising an antenna (2) a method of fabricating a transmission/reception antenna.