Design of low profile wideband high power waveguide to substrate integrated waveguide coupler

Abstract

This paper presents a new wideband waveguide substrate integrated waveguide (SIW) coupler with maximum deviation of ±0.5 dB in a 7.5–12.25 GHz bandwidth (48% fractional bandwidth). Proposed coupler consists of the standard WR90 waveguide and single layer/double clad SIW printed circuit board (PCB) which is placed crosswise on the waveguide. Proposed three port coupler (isolated port was ended with match load) has a two coupling level (average of coupling in 8–12 GHz frequency range) of 43.2 and 58.3 dB, which is correspond with the hole diameter of 3.5 and 3 mm, respectively. The main contribution of this work is based on the hybrid techniques of SIW and RWG for coupler design in the high power microwave application. Validation of the simulation results with measurement one proves that the proposed X‐band waveguide to SIW coupler is a good candidate for use in high power industrial/commercial applications.

A high‐power coaxial to rectangular waveguide transition

“…The rectangular waveguide, which has the advantages of simple structure, low loss, high-quality factor, and high power handling capability (PHC), has been widely employed in the design and development of high-power microwave transmission systems. [1][2][3][4][5][6] However, signal generators typically utilize a standard coaxial port operating in the TEM mode. Therefore, it is essential to investigate high-power converters to match the signals between rectangular waveguide and coaxial line of different propagation modes.…”

“…In recent years, high‐power microwave technology has been used in various fields. The rectangular waveguide, which has the advantages of simple structure, low loss, high‐quality factor, and high power handling capability (PHC), has been widely employed in the design and development of high‐power microwave transmission systems 1–6 . However, signal generators typically utilize a standard coaxial port operating in the TEM mode.…”