Switched retractable, extendable, dual antennas for portable radio

摘要

High gain antenna equipment is provided by improving gain with optimal impedance matching with an antenna element in a stored state as well as in an extended state. The antenna equipment is provided with a radio communication device housed in a case, a pullout type antenna element, a coil acting as a matching circuit element in an extended state of the antenna element and as a helical antenna in a stored state, and a switch connected to the coil at one end which is brought into contact at the other end with a ground terminal when the antenna element is in an extended state and which is brought into contact with an open terminal when the antenna element is in a stored state.