Transition of 94‐GHZ coplanar waveguide to rectangular waveguide on flip‐chip bonding compatible substrate

Abstract

the H-matrix-based FBS efficiently. Via the modification algorithm, the approximate solution computed by the H-LU direct method was improved to more accurate one at low costs. The validity of the proposed method has been demonstrated in the 3D electromagnetic scattering problems analyzed by FEM.

Broadband Coplanar Waveguide to Air-Filled Rectangular Waveguide Transition

“…In some microwave and millimeter-wave systems, it is necessary to apply both CPW and rectangular waveguide; thus, developing a high-performance transition between them is needed. Over the last few decades, various CPW-to-waveguide transitions have been reported in the literatures [10][11][12][13][14][15][16]. Based on the relative position between the waveguide and the coplanar waveguide, the designs can be classified into two distinct types: in-line and right-angle transitions.…”

“…Several approaches have been proposed to improve the performance of in-line transition between the CPW and rectangular waveguide in [10][11][12][13]. As is reported in [10], a CPW-to-rectangular-waveguide transition can be achieved by using a tapered fin-line, but this suffers from an electrically large substrate size.…”

“…As is reported in [10], a CPW-to-rectangular-waveguide transition can be achieved by using a tapered fin-line, but this suffers from an electrically large substrate size. In [11], the transition of CPW to RWG was achieved on a high-permittivity sapphire substrate. However, the above-mentioned structures in [11][12][13] need air-bridges to enhance their performance.…”

“…In [11], the transition of CPW to RWG was achieved on a high-permittivity sapphire substrate. However, the above-mentioned structures in [11][12][13] need air-bridges to enhance their performance. At the same time, right-angle transitions between CPWs and rectangular waveguides have also been widely studied [14][15][16].…”

“…Most of the previous works [12][13][14][15][16] were optimized for low-permittivity substrates. The transitions in [10,11] can be realized on a high-dielectric-constant dielectric substrate, but the transition circuit occupies an electrically large area because of the tapered fin-line [10] and the relative bandwidth is merely 21.1% in [11].…”