Abstract
In this paper, we will present a planar geometry design for a 6dB compact microwave coupler, and will further explore and discuss the results of an electromagnetic simulation in Sonnet® Suites™ Electromagnetic simulation software. Being a compact coupler, the device features a minute circuit footprint size, while still observing the limitations of the production technologies involved in manufacturing it. The technology utilized in the paper is a 4 port microstrip copper trace on a production-friendly and extremely economical FR4 dielectric substrate. The circuit shows excellent performance in a 1.8GHz bandwidth (3.9GHz – 5.7GHz), with a loss of 6dB on the coupled port. A further advantage of this geometry is a very linear and predictable change in the S-parameter values as a result of small linear changes in the geometry
Highlights
In this paper we presented a planar geometry design for a 6dB compact microwave coupler and further explored and discussed the results of an electromagnetic simulation in Sonnet® SuitesTM Electromagnetic simulation software
A microstrip coupler is a 4-port device designed to divide the power entering on one port to the two opposite ones, while leaving one port in isolation [1]
Important advantages of microstrip technology are its ease of production, low cost, reliability and durability, as well as the virtually limitless geometry design space, allowing for devices tailor made to their specific application requirements [5]
Summary
A microstrip coupler is a 4-port device designed to divide the power entering on one port to the two opposite ones, while leaving one port in isolation [1]. The efficiency of exploring this design space can be optimized by relying on a baseline design that responds well to variations, both for the purposes of developing a specific design, and for the robustness of the designed geometry with respects to the inaccuracies of the manufacturing process[6][7]. This geometry was based off a compact 3dB directional coupler developed by the Ural Federal University [4] and motivated by the formers constrained amenability to adaptations in geometry for different application specifications
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