Design and Simulation of Beamformer based on a 4x4 Butler Matrix in the 3.6GHz with a Single Cross over

Abstract

The study presents the development and analysis of a compact and efficient beamforming network. The proposed design is based on a 4x4 Butler matrix integrated with a single crossover, which plays a crucial role in reducing the complexity and size of the beamformer. The beamformer operates at a frequency of 3.6 GHz, targeting applications in wireless communication systems. The structure was implemented on an FR4 substrate, chosen for its cost-effectiveness and reasonable performance. The overall dimensions of the design are 25x19 mm, making it compact and suitable for integration into modern communication systems. The simulation results, carried out using the ADS simulator, demonstrate promising performance metrics. The beamformer achieved a directivity of 10.291 dBi and a gain of 6.0751 dBi, indicating its ability to focus energy in desired directions effectively. The radiation efficiency was found to be 59.033%, which, while modest, is acceptable for the targeted application. Additionally, the return loss was measured at -46 dB, reflecting excellent impedance matching and minimal signal reflection. The design also offers a bandwidth of 57 MHz, which is adequate for many wireless communication applications. Overall, the proposed beamformer design presents a balanced trade-off between performance, size, and complexity, making it a viable option for next-generation wireless communication system.