| 摘要 |
PURPOSE:To improve the reception sensitivity without losing the simplicity performance is use by adopting a constitution wherein the titled auxiliary antenna is fitted to a container case in a way to be coupled electromagnetically with the built-in antenna of a radio equipment. CONSTITUTION:The container case 3 having a built-in antenna 2 mounted in an enclosure 1 of a portable radio equipment main body is equipped with the portable radio equipment as an auxiliary component freely attachably and detachably. The titled auxiliary antenna 14 has at least a parallel turning circuit comprising an inductor(ferrite antenna) 12 and a capacitor 13 coupled in parallel with said inductor 12 and a conductor 14 having a desired length connected to part of the circuit and fitted to the container case 1 in a way coupled electromagnetically with the built-in antenna 2. Thus, the reception sensitivity is improved without losing the simplicity performance of use for the portable radio equipment and without increasing the radiation of harmonic from a local oscillation circuit consituting the receiver.
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