A Design of Compact Microwave Six-Port Device for Ultra-Wideband Applications

Abstract

Abstract-A compact fully integrated wideband six-port device composed of a suspended stripline Wilkinson power divider and three bias stripline of 3-dB quadrature directional couplers is presented. In order to integrate a six-port circuit, a multilayer circuit structure has been adopted by the via hole interconnection at the output port of the divider. The 3-dB quadrature directional coupler is composed of two 8.34-dB quadrature directional couplers by series connection. In this way, the six-port circuit structure is simplified and reduced. A multisection impedance match structure has been adopted in the suspended stripline Wilkinson power divider to achieve ultra-wide frequency band. In the experiment, the fully integrated six-port device has obtained good measurement result. It is superior to other present six-port networks in microwave performance with the same dimension.

Ultra-Wideband Six-Port Network Miniaturization—Matching

“…In [19], modified series diamond stubs were used along with power divider (PD) and branch line couplers, achieving 75 FBW and a size of about 0.34 λ 2 . Multilayer technology is employed in [20–22], utilizing the multisectional approach for hybrid coupler (HC) and PD. Therein, an improvement in FBW from 120 to 150 is reported, but the compactness is partly sacrificed as the size is increased to about 3.48 λ 2 .…”

A Ku-Band SIW six-port

“…Generally, the six-port interferometer is formed by the interconnection of power dividers, couplers, and phase shifters [4][5]. Compared to the traditional coaxial cavities or microstrip technique, SIW is known to take advantages of both waveguide and microstrip structures, such as low loss, high power capacity, low cost and easy to integrate in the planar circuit [6][7][8].…”