| 摘要 |
Antenna system for double polarization in two high frequency bands of different frequency positions includes a orthomode transducer, in the following text called polarization filter having an antenna end terminal and two directional terminals, one being for right circular polarized waves, and the other being for left circular polarized waves. These directional terminals connect, respectively, with two frequency filters which separate the signals into the lower of the two high frequency bands, and the higher of the two high frequency bands. There are two 3-dB 90 DEG directional couplers, one of which handles right and left circular polarized signals of the lower frequency band, and the other of which handles right and left circular polarized signals of the higher frequency band. The polarization filter is constructed to be phase-symmetrical with respect to its transit paths. The directional terminals of the polarization filter are connected directly to the frequency filters, respectively, or through two structurally symmetrical 45 DEG twisted components of different twisting directions. The connection lines between the frequency filters and the directional couplers in each case for the two frequency bands occupy dual polarization directions of the same frequency range. These are phase-symmetrical pairs of lines with connection elements which match one another in pairs at the same point of the line.
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