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A Beam Switching Slot Array with a 4-Way Butler Matrix Installed in Single Layer Post-Wall Waveguides
Shin-ichi YAMAMOTO Jiro HIROKAWA Makoto ANDO
IEICE TRANSACTIONS on Communications
Publication Date: 2003/05/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antenna and Propagation
Butler matrix, switching array, base station antenna, post-wall waveguide, millimeter-wave,
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The authors proposed a switching beam slot array antenna with a 4-way Butler matrix. All are integrated in one substrate with post-wall waveguide techniques. The planar Butler matrix is realized by using short slot directional couplers (cross coupler). Experiments in 26GHz band confirmed the key operation of this antenna; almost identical four beams are switched to cover the total of horizontal 90-degree sector with equal angular spacing.