Compact Pixelated Microstrip Forward Broadside Coupler Using Binary Particle Swarm Optimization

TL;DR

This paper presents a compact, high-performance microstrip forward broadside coupler designed using binary particle swarm optimization, suitable for wireless power transfer and sensor applications.

Contribution

The paper introduces a novel pixelated microstrip coupler optimized with BPSO, achieving desired coupling and frequency in a small size with low sensitivity to misalignment.

Findings

Achieved 3 dB coupling in a 0.12λg x 0.10λg size

Validated design through fabrication and measurement

Low sensitivity to misalignment enhances application potential

Abstract

In this paper, a compact microstrip forward broadside coupler (MFBC) with high coupling level is proposed in the frequency band of 3.5-3.8 GHz. The coupler is composed of two parallel pixelated transmission lines. To validate the designstrategy, the proposed MFBC is fabricated and measured. The measured results demonstrate a forward coupler with 3 dB coupling, and a compact size of 0.12 {\lambda}g x 0.10{\lambda}g. Binary Particle Swarm Optimization (BPSO) design methodology and flexibility of pixelation enable us to optimize the proposed MFBC with desired coupling level and operating frequency within a fixed dimension. Also, low sensitivity to misalignment between two coupled TLs makes the proposed coupler a good candidate for near-field Wireless Power Transfer (WPT) application and sensors.