Design of 4 x 4 60GHz SIW Butler Matrix
Date Issued
2008
Date
2008
Author(s)
Ju, Jian-Yu
Abstract
In this thesis, two different structures of 3dB couplers and a 4 x 4 Butler matrix using substrate integrated waveguide (SIW) are designed. The two couplers, a short-slot coupler and a top-wall coupler, are fabricated on Roger RT/duroid 5880® substrate. In addition, the 3db couplers are used to realize a 4 x 4 Butler matrix. The circuits are designed at 60GHz. SIW is a known structure to have the characteristics of low loss and can be easily integrated with other planar circuits on a single printed circuit board (PCB) for microwave and millimeter-wave components.The circuit simulation is performed by using Ansoft HFSS® 10.0 along with initial parameters calculated by the design formulas given in each chapter. Based on the simulation results, a short-slot coupler, a top-wall coupler and a 4x4 Butler matrix are implemented on a double layered Roger RT/duroid 5880® with 10mil thickness.This thesis is composed of five chapters. In Chapter 1, study motivation and paper survey are presented. Chapter 2 reveals the characteristics and structure of SIW. Chapter 3 describes the formulas to design a short-slot coupler and a top-wall coupler using SIW structure. Problems and considerations related to multi-port circuit measurement are also discussed. Using the 3dB couplers designed in Chapter 3, a 4x4 Butler matrix is designed with measured results in Chapter 4. Finally, this research study is concluded with Chapter 5.
Subjects
short-slot coupler
top-wall coupler
Butler matrix
Type
thesis
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