| 摘要 |
PROBLEM TO BE SOLVED: To provide an array antenna, whose directivity can be controlled and equipped with a stable variable phase shifter with small waveform distortions and intermodulation distortions, superior withstanding power, at a low loss. SOLUTION: In the array antenna provided with the variable phase shifter P, the variable phase shifter P has a transmission line or a circulator, a variable capacitance capacitor Ct is connected to a ground side of the transmission line or a ground side terminal of the circulator, in the variable capacitance capacitor Ct, a plurality of variable capacitive elements C1 to C5 employing thin film dielectric layers whose dielectric constant varies with the applied voltage are connected in parallel, in terms of DC, and in series in terms of high frequencies between the input terminal and the output terminal. Thus, an array antenna is realized, whose directivity can be controlled adaptively and which is provided with the stable variable phase shifter having little waveform distortion and intermodulation distortion, superior withstanding power, and with low loss even at high frequencies. COPYRIGHT: (C)2005,JPO&NCIPI
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