GHz phase shift experiments of WDM - based optically controlled transmitting array antenna

نویسندگان

  • Abhijeet Gupta
  • Sudhir Kumar
چکیده

Advanced satellite communications system needs large-scale satellite-borne antenna with a function of beam steering and/or multiple spot beams to cover wide service area with high antenna gain. Although phased array antenna is very useful for the feed for the large reflector to satisfy the requirements above, it generally causes increase in the equipment weight, feed loss, and complexity in beam forming network as increase of the number of the antenna elements and the frequency. Especially for the array antenna in Ka-band or millimeter-wave uses, it is important to reduce the size, weight and insertion loss of the beam forming network. One of promising technologies to overcome these difficulties is application of the optically controlled array antenna for the satellite-borne antenna. In the array antenna, RF signals are optically modulated, transmitted via optical fiber, and phase and amplitude of each RF signal are controlled by using the optical beam forming network. Optically controlled array antennas using optical delay lines with different length [1] and spatial light modulator [2] are proposed and experimentally verified in Japan as research on optically controlled array antenna specialized for Kuand Ka-band satellite communications use. On the other hand, optical dispersion techniques having true-time delay characteristics suitable for wide/multi-bandwidth operation are also proposed and verified [3], [4], although temperature instability of the delay in the optical fiber is one of the technical issues. In this paper, the WDM-based optically controlled array antenna consists of WDM optical sources and an optical dispersion fiber is fundamentally investigated aiming for future millimetrewave satellite communication use. Since the proposed WDM-based array antenna has true-time delay characteristics suitable for wide/multi-bandwidth operation and uses only the difference in time delay at each wavelength within the same fiber and does not cause microwave phase instability due to temperature, it is suitable to realize complex beam forming using array antenna with wide/multi-bandwidth operation. We have already experimentally verified 20 GHz phase characteristics of WDM-based optically controlled array antenna for both transmitting and receiving antenna [5]. In order to verify phase accuracy of the proposed array antenna at millimeter-wave frequency, 40 GHz phase shift experiments of WDM-based optically controlled array antenna for transmission is reported.

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تاریخ انتشار 2014