Design of Wideband Microstrip to SICL Transition for Millimeter-Wave Applications

Idury Satya Krishna,Soumava Mukherjee

doi:10.1109/access.2019.2962905

Abstract

In this communication, the design and working principle of a wideband microstrip to substrate integrated coaxial line (SICL) planar transition for millimeter-wave applications is presented. In the proposed work, along with tapering of microstrip line, two triangular slots in the top ground plane are utilised to compensate for the discontinuity arising at the microstrip-SICL junction & minimize reflections over a wide bandwidth. To confirm the theoretical claims, the proposed microstrip to SICL transition is fabricated using standard multilayer PCB process. The measured results of the prototype indicate return loss better than 14 dB with a maximum insertion loss of 1.78 dB for DC to 40 GHz band (19 dB bandwidth up to 20 GHz with insertion loss less than 0.71 dB). The modeling of proposed transition is presented & versatility of the design is illustrated for different dielectric constant & thickness. Effortless integration of SICL with the widely used microstrip transmission line simplifies the feeding process of SICL based broadband antennas & microwave circuits.

Highlights

The fifth generation (5G) communication exhibits potential to support diverse services owing to its high data rate
The proposed back to back microstrip to substrate integrated coaxial line (SICL) transition is tested with the help of a K-Type (2.4mm) end-launcher using Agilent E8361C PNA
The design and analysis of wideband microstrip to SICL transition is presented in this work

Summary

Introduction

The fifth generation (5G) communication exhibits potential to support diverse services owing to its high data rate. Novel technologies in planar form have emerged for efficient design of microwave/millimeter-wave circuits [3]–[5]. In [3], planar counterpart of waveguide has been extensively utilized to develop various microwave circuits and antennas. A novel methodology to interconnect substrate integrated suspended line with coplanar waveguide is shown in [4]. A newer technology to synthesize the traditional coaxial line in planar form was devised in [5], namely substrate integrate coaxial line (SICL). This structure referred as fenced stripline [7], [8] supports low loss at millimeter-wave frequency and prohibits propagation of undesired parallel plate mode.

Methods

Results

Conclusion