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S-Band Active Phased Array Antenna With Analog Phase Shifters Using Double-Balanced Mixers for Mobile SATCOM Vehicles

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7 Author(s)
Miura, A. ; Antenna Res., Anal., & Meas. Lab., Univ. of California, Ibaraki, Japan ; Fujino, Y. ; Taira, S. ; Obara, N.
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We propose an S-band active phased array antenna (APAA) with analog phase shifters (PSs) that use double-balanced mixers (DBMs). The quadrature phase shift keying modulator integrated circuits (ICs) used as the phase shifters can control both the amplitude and phase of the input signal continuously and independently by using the control voltages. The phase and amplitude errors during phase rotation were 0.5$^circ$rms$(max=1.7^circ)$and 0.3 dB rms ($max=0.7$dB), respectively. The range in which the amplitude could be linearly changed was 7 dB. The proposed antenna exhibited sufficient performance for mobile vehicles to handle satellite communications: beam-pointing resolution of 0.04$^circ$, beam-pointing accuracy in the null pointing of 0.4$^circ$rms, and sidelobe suppression with an amplitude taper achieved by setting the amplitude of the PS using two DBMs. Comparison between the analog PS and a reflection-type four-bit digital PS showed that although the analog one is unsuitable for use in a passive PAA, it is suitable for use in an APAA.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:53 ,  Issue: 8 )

Date of Publication:

Aug. 2005

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