| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multfrequency shared transmitter/receiver for receiving a plurality of frequencies and different polarization, using a single antenna which has a simple constitution and can be made compact. <P>SOLUTION: The multifrequency shared transmitter/receiver is configured, by combining a polarization switching type multi-band plane antenna 1 and a demultiplexer 2. The polarization switching type multi-band plane antenna 1 is provided with a plurality of ring antenna elements, with peripheral length of about one wavelength worth and is equipped with perturbing elements at a plurality of point symmetric positions and a power supply part, and are set so that right circular polarization and linear polarization can be generated. The demultiplexer 2 is configured, by combining duplexers DUP1 to DUP4 to demultiplex, for example, the radio waves of GPS(1.2 GHz and 1.5 GHz), wireless LAN(2.45 GHz) and ETC(5.2 GHz and 5.8 GHz) received by the multi-band plane antenna 1, and output it from output terminals 4a to 4n. <P>COPYRIGHT: (C)2009,JPO&INPIT |
