Techniques for antenna sidelobe suppression and laser power reduction in optically controlled array antenna

Yoshihiko Konishi; Wataru Chujo; Hisao Iwasaki; Koji Yasukawa

doi:10.1117/12.18141

1 June 1990 Techniques for antenna sidelobe suppression and laser power reduction in optically controlled array antenna

Yoshihiko Konishi, Wataru Chujo, Hisao Iwasaki, Koji Yasukawa

Proceedings Volume 1217, Optoelectronic Signal Processing for Phased-Array Antennas II; (1990) https://doi.org/10.1117/12.18141
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

The required output power of a laser source and suppression of antenna sidelobe level are discussed for an optically controlled array antenna in which microwave amplitude and phase distributions are generated and controlled using optical Fourier transform and heterodyne/homodyne detection. A heterodyne detection model using two laser diodes, the frequency difference of which is set to desired microwave frequency, is compared with an original homodyne detection model, using an external frequency modulator. The heterodyne detection model may be favorable from the viewpoint of available laser diode output power. For example, the required laser output power in the heterodyne detection model can be about 10-15 dB less than that in the homodyne detection model in order to obtain the same C/N0 value of microwave signal. It is also shown that the antenna sidelobe level can be suppressed by about 20 dB without changing beamwidth by using a reference beam with a tapered distribution.

Citation Download Citation

Yoshihiko Konishi, Wataru Chujo, Hisao Iwasaki, and Koji Yasukawa "Techniques for antenna sidelobe suppression and laser power reduction in optically controlled array antenna", Proc. SPIE 1217, Optoelectronic Signal Processing for Phased-Array Antennas II, (1 June 1990); https://doi.org/10.1117/12.18141

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