Design and Development of a Compact Rat-Race Coupler

D Ramakrishna,S Ahirwar,V M Pandharipande

doi:10.7716/aem.v8i3.1047

D Ramakrishna, S Ahirwar + Show 1 more

Open Access

https://doi.org/10.7716/aem.v8i3.1047

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Abstract

In this paper, design and development of compact Rat- Race coupler is presented. The device is designed with commercially available semi rigid coaxial cable. The semi rigid coaxial is modified for desired impedance to suit the requirement of Rat- race hybrid coupler. The physical structure of the coupler is in rectangular form instead of the conventional ring form. With this structure, all the ports are available in line on the same side. This eases the integration of the device with other modules or devices in the system. The total area occupied the coupler is reduced drastically by meandering the transmission line. The shielded transmission line provides better port isolation and less radiation loss. Design, implementation and measured results are presented.

Highlights

With rapid advancement in wireless communication systems and other microwave systems, these systems are being miniaturized
The rat-race coupler is transmission line based device in which output appearing at a particular port depends on the phase of the signals arriving at that port following different paths
Strip line and co-planar wave guide, it is implemented as 3dB hybrid coupler

Summary

Introduction

With rapid advancement in wireless communication systems and other microwave systems, these systems are being miniaturized This leads to the compact and handheld devices and systems. The rat-race coupler is transmission line based device in which output appearing at a particular port depends on the phase of the signals arriving at that port following different paths. This can be designed and implemented in wave guide as magic Tee. In micro strip line, strip line and co-planar wave guide, it is implemented as 3dB hybrid coupler. The various coupler designs [14] are compared for their performances with respect to form factors of these couplers

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Conclusion