| 摘要 |
PROBLEM TO BE SOLVED: To reduce undesired radiation from radio communication equipment such as television broadcasting repeater. SOLUTION: Transmission signals related to a plurality of frequency channels are synthesized by an output mixer 33A and a synthetic transmitting signal obtained as a result is simultaneously amplified by an MCPA (multichannel simultaneous power amplifier) 44A. Since the amplified output contains a frequency of components to become unwanted radiation such as a component belonging to a frequency channel to be received, for example, such a component is blocked/removed by a filter such as a notch filter 71A with the frequency channel to be received as a block area, for example. The notch filter 71A is provided by matching/terminating the narrow band input terminal of a CIB (impedance fixed) type antenna multicoupler, connecting the wide band input terminal to the side of the MCPA 44A and connecting the synthetic output terminal to the side of a transmission antenna.
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