171 / 2016-12-09 17:29:03

Miniaturization of 4x4 Butler Matrix Using High Slow-Wave Factor Structure

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In this paper, a novel slow-wave structure with high slow-wave factor is proposed. The new structure composed of meandered-line structure, low-impedance transmission line and interdigital structure is capable of reducing the circuit size significantly due to its good slow-wave property. A miniaturized 4x4 Butler matrix resonant at 970 MHz is designed using the proposed structure. The size of the proposed 4x4 Butler matrix is merely 5.8% of the conventional ones. The measured results of the manufactured are in good agreement with the simulated results.