Smart Antenna using Switched Multibeam Array Ms
This paper describes the design and realization of a 44 Butler Matrix as a beam forming network along with 4 linear antenna arrays to obtain four steerable beams, operating at 2.4 GHz. The simulation results are obtained using HFSS software. Further the concept of multibeam switching is discussed with an idea of suspended feed in between two matrices.
4×4 Butler Matrix Beam Forming Network using Novel Reduced Size Branchline Coupler
This paper presents a reduced size quadrature branch-line coupler that has achieved size reduction by approximately up to 80% without having to compromise performance. This design is realized on a low cost substrate (FR4, 0.50mm, ¿r = 4.4), yields an excellent return loss (¿49.0dB) and coupling loss (¿3.30 ~ ¿3.50dB) characteristics at 1.8GHz. The practical application of this novel reduced size branch-line coupler has been implemented and demonstrated in a 4×4 Butler Matrix beam-forming network operating at 1.7-2.0GHz.
Design and realisation of reduced-size impedance transforming uniplanar MMIC branchline coupler
Design equations for the realisation of a reduced-size impedance transforming branchline coupler are presented together with the measured results of a fabricated prototype GaAs MMIC coupler using coplanar waveguide (CPW) transmission lines. The coupler which is less than 25% of the area of the standard branchline coupler has low coupling imbalance, with good return losses, and excellent isolation.