An Electro-Optic BFN For Array Antenna Beam Forming

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概要

• 論文の詳細を見る

• This paper proposes a new type of optically controlled BFN (beam forming network), an electro-optic BFN using an optical waveguide structure. In this BFN, antenna beam forming is performed using conventional optical variable phase shifters and conventional optical variable directional couplers. An electro-optic BFN can easily utilize monolithic integration capability that will be advantageous to microwave stabilization. In order to discuss practical applicability, microwave characteristics and beam forming characteristics were examined using an experimental BFN fabricated on a LiNbO_3 substrate. Resulting from electro-optic lightwave control, linear phase shifting and variable amplitude distribution were measured at various microwave frequencies. Without any other control except for optical offset frequency locking and applying constant voltages, typical short term fluctuation in L-band microwave was measured to be within 3 degrees_ltp-pgt in phase and 2.5 dB_ltp-pgt in amplitude, respectively. For the first time, an electro-optic BFN was successful in performing beam forming in an L-band array antenna as well as coaxial cables. It was also verified that radiation pattern measured in 60 degree beam steering using the experimental BFN was comparable to that calculated using conventional microwave BFNs. The experimental results show the feasibility of utilizing an electro-optic BFN in future advanced microwave/millimeter-wave array antenna systems.

• 社団法人電子情報通信学会の論文
• 1995-08-25

著者

• Chujo W

  Strategic Planning Division Communications Research Laboratory

• Chujo Wataru

  Atr Optical And Radio Communications Research Laboratories

• Kamiya Y

  Tokyo Univ. Agriculture And Technol. Koganei‐shi Jpn

• Kamiya Yoshiaki

  Kokusai Denshin Denwa Co. Ltd. RampD Laboratories

• Murakami Yasushi

  ATR Optical and Radio Communications Research Laboratories

• Fujise Masayuki

  Kokusai Denshin Denwa Co. Ltd. RampD Laboratories

• Fujise M

  Wireless Communications Laboratory National Institute Of Information And Communications Technology

• Murakami Yasushi

  Department Of Fine Materials Engineering Faculty Of Textile Science And Technology Shinshu Universit

• Murakami Y

  Ntt Access Network Serv. Systems Lab. Tsukuba‐shi Jpn

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