| 摘要 |
PURPOSE:To save one hybrid circuit by connecting a band stop filter, a resistive terminator and a band pass filter to one hybrid circuit in the transmission circuit or the reception circuit of an antenna system. CONSTITUTION:A signal transmitted from the input terminal 5 of a hybrid circuit 1 is distributed by the hybrid circuit 1 in the same amplitude and opposite phase and sent to the band block filter 2. Only a desired frequency f0 is not transmitted but reflected by the filtering of the band stop filter and sent reversely to the hybrid circuit 1. This signal is inputted to the hybrid circuit 1 in the same amplitude and in phase because of the spacing of 1/4 wavelength of each band stop filter 2, resulting that the signal is not returned to the input terminal 5 but sent to the band pass filter 4.
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