New radio wave technologies of millimeter-wave (mmWave), compact cell size, and multi beam base station are introduced with the recent development 5G mobile system. The Butler Matrix (BM) feed circuit is most preferable candidate for system since it can achieve radiationpatterns at array antenna, provide structural compactness produce good beams.The BM typically built on a single dielectric sub...

High-throughput satellite (HTS) systems usually make use of Multibeam coverage at high frequency bands in order to offer broadband access of large areas. Multibeam coverage increases the available capacity through frequency reuse and spatial separation. However, one of its major drawbacks is interspot interference which considered the motivation to propose a new approach using a coding techniqu...

This paper introduces a novel design of Butler matrix in substrate integrated waveguide (SIW) technology with wide frequency band characteristics. Butler matrices are particularly useful in advanced antenna design and characteristics such as wideband operation, power handling, manufacturing, integration, cost, etc. are typical issues to be addressed in many applications. The proposed planar 4 ×...

In this paper, a new beamforming technique for planar two-dimensional arrays is proposed optimizing the sidelobe levels (SLLs) by using recursive multibeam pattern subtraction (MPS) technique. The MPS beamformer demonstrated and its convergence to lower SLL values investigated controlled. performance analysis has shown that can effectively reduce down less than −50 dB relative mainlobe level ut...