Photonic Integrated Beam Forming and Steering Network Using Switched True-Time-Delay Silica-Based Waveguide Circuits

Kohji HORIKAWA  Ikuo OGAWA  Tsutomu KITOH  Hiroyo OGAWA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E79-C   No.1   pp.74-79
Publication Date: 1996/01/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optomicrowave Techniques and Their Applications)
Category: Optically Controlled Beam Forming Networks
Keyword: 
active phased array antenna,  true-time-delay,  BFN,  silica-based waveguide circuit,  

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Summary: 
This paper proposes a photonic integrated beam forming and steering network (BFN) that uses switched true-time-delay (TTD) silica-based waveguide circuits for phased array antennas. The TTD-BFN has thermooptic switches and variable time delay lines. This TTD-BFN controls four array elements, and can form and steer a beam. An RF test was carried out in the 2.5 GHz microwave frequency range. The experimental results show a peak-to-peak phase error of 6.0 degrees and peak-to-peak amplitude error of 2.0 dB. Array factors obtained from the measured results agree well with the designed ones. This silica-based beam former will be a key element in phased array antennas.