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Compact broadband Butler matrix in multilayer technology for integrated multibeam antennas

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3 Author(s)
Gruszczynski, S. ; Inst. of Telecommun., Wroclaw Univ. of Technol., Wroclaw ; Wineza, K. ; Sachse, K.

A compact broadband low-loss 4 x 4 Butler matrix is presented, for the first time in multilayer asymmetric technology A coupled-line 3 dB compensated microstrip multilayer directional coupler is utilised as a basic element of the Butler matrix. Excellent performance is achieved over one-octave frequency band in terms of amplitude and phase responses. A tandem connection of two 3 dB directional couplers with reference lines is used as a crossover of transmission lines giving, additionally, the needed broadband 45deg phase shift; moreover, no interlayer connections are necessary. The network can be easily applied in integrated planar and conformal multibeam antenna arrays as a surface mount element.

Published in:

Electronics Letters  (Volume:43 ,  Issue: 11 )