Abstract: A matching circuit for an antenna, including a printed circuit substrate and an inductor, coupled to the antenna, made by printing a trace on a surface of the substrate. A first capacitor is formed in series with the inductor by creating a gap in the inductor trace. Preferably, the inductor shunts the antenna to ground, and a second capacitor is coupled in series with the antenna.

Abstract: A retractable antenna for use with portable communication equipment comprising two electrically independent electromagnetic radiators in a single package with two modes of operation, retracted and extended. When the antenna is in its retracted position, a short normal-mode monofilar helical radiator is functional. When the antenna is in its extended position, a thin linear radiating element is functional. A switch is provided which connects the internal circuitry of the device to the linear radiating element when the antenna is in its extended position and which connects the internal circuitry of the device to the helical radiator when the antenna is in its retracted position. In each of the extended and retracted positions, the linear radiator and the helical radiator are isolated from one another. A modified form of the antenna is also disclosed.