Abstract
In this paper, a microstrip-based 4 ×8 Butler matrix (BM) is presented. The main benefit of the design is the miniaturization of the beamforming network (BFN) structure. To obtain this objective, a classic 4×4 BM is designed, and then extended to a 4×8 one using dual substrate structure by implementing microstrip-to-slot line transitions. As a result, six of the crossovers in the traditional 4×8 BM topology are replaced by four transitions with low loss structures. To verify the BFN, an 8-element linear antenna array is integrated with the BM. By feeding the antenna array with the proposed 4×8 BM, four beams are generated in the azimuth plane pointing at difference directions with the scanning range of ±45 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> operating at 27.5 GHz to 28.5 GHz band. The design is verified by the simulation results. Being compact, cost efficient, low-profile, and ease of fabrication makes the reported multi-beam antenna array an ideal candidate for fifth-generation (5G) communication systems.
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