| 摘要 |
A horizontally polarized wave signal is amplified in low-noise by two first LNAs connected in series to each other. The resulting low-noise amplified signal is entered into a first high electron mobility transistor mixer via a first band-pass filter. The first high electron mobility transistor mixer converts the signal into an intermediate frequency signal based on local power fed from a local oscillator via a Y-type distribution circuit and a first directional filter, and provides the converted signal as an output thereof. Meanwhile, a vertically polarized wave signal is amplified in low-noise by two second LNAs connected in series to each other. The resulting low-noise amplified signal is entered into a second high electron mobility transistor mixer via a second band-pass filter. The second high electron mobility transistor mixer converts the signal into an intermediate frequency signal based on local power fed from the local oscillator via the Y-type distribution circuit and a second directional filter, and provides the converted signal as an output thereof.
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