PORTABLE RADIO TRANSCEIVER

摘要

PURPOSE:To attain much stronger structure and stable transmission/reception efficiency by providing a metallic reinforcement member formed in a frame form in the inside of a card form case accommodating a transmission/reception circuit and cutting off a part of it so as to make it discontinuous. CONSTITUTION:A case 21 is made of a nonmagnetic substance such as a synthetic resin and the outer shape is formed as a rectangular prism with thin profile of nearly same size as a credit card. Circuit sections 22a-22d provided with a reception signal of a request signal and a transmission circuit of a specific code signal are contained in the case 21 and a small sized battery 23 being a power supply is accommodated. A loop antenna 24 to transmit/receive the request signal and the specific code signal is provided in the inner circumference in the case 21. Moreover, a metal-made reinforcement member 25 formed in a frame form along the inner circumference of the case 21 is provided to the outer circumference of the loop antenna 24. A notch part 25a is provided to the reinforcement member 25 so as not to constitute an electric closedloop thereby attaining stable transmission/reception.