Q-Band Radial Waveguide Power Divider Based on a Specific Cycloidal-Like Transition Implementation

Fei Liang,Yuankai Li,Jiaquan Ye,Jian Xu,Bin Yuan,Huan Lin

doi:10.1109/access.2022.3150095

Abstract

An axially symmetric radial waveguide power divider, which utilizes a specific Cycloidal-Like tapered transition between a central coaxial launcher and a radial waveguide, is presented in this paper. In order to broad the operation band, the change of impedance of the coaxial to radial waveguide transition is investigated, and an analytic expression for the shape of the transition is obtained. A simple electromagnetic modeling for the stepped radial matching network is developed, and its characteristics are analyzed in detail using the circuit method. Eventually, a stepped-by-stepped design procedure for the power divider is established for the design of the radial waveguide power divider. A twenty-way radial waveguide divider is designed, fabricated, and measured to validate the proposed method. The measurements show that the return loss at the input port is better than 20 dB over almost the full <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${Q}$ </tex-math></inline-formula> -band (33 to 48 GHz), while the amplitude/phase imbalance are within ±0.5 dB and ±3°, respectively. The simulated and measured results demonstrate a high degree of agreement.

Highlights

R ECENTLY, due to the rapid advancements of military and commercial communication systems, there are increasingly demand for broadband microwave and millimeterwave high-power solid-state amplifiers
Where εr is the relative permittivity of the dielectric, ε0 is the permittivity of the vacuum, μ is the permeability of the dielectric, h is the height of the radial waveguide, and r is the radial distant
The power divider was divided into two aluminum plates, which were implemented by a conventional CNC split-block fabrication process

Summary

INTRODUCTION

R ECENTLY, due to the rapid advancements of military and commercial communication systems, there are increasingly demand for broadband microwave and millimeterwave high-power solid-state amplifiers. The method was validated with a fabricated eightway combiner with a measured reflection coefficient better than -22 dB in the frequency range from 1.5 GHz to 5.5 GHz. It is certain that these radial combiners all obtain a wide bandwidth, they are all based on coaxial or microstrip as output, which limits the power capacity of the device to some extent. It is certain that these radial combiners all obtain a wide bandwidth, they are all based on coaxial or microstrip as output, which limits the power capacity of the device to some extent All these transitions operate only in the lower bands (S, C-band [14], X-band [10], [24]). DESIGN PROCEDURE FOR CYCLOIDAL-LIKE IMPEDANCE TAPER TRANSITION In general, to achieve broadband matching as well as high power capacity, the coaxial-to-radial waveguide transition y. The total length of the transition is considered to be equal to the length of the inner conductor profile (denoted by Sk(1).)

DESIGN OF THE 1-ST SECTION

DESIGN OF THE K-TH SECTION

DESIGN OF THE LAST SECTION OF THE INNER CONDUCTOR PROFILE

SUMMARY OF THE DESIGN PROCEDURE FOR THE

CONCLUSION