Substrate Integrated Waveguide Transitions to Planar Transmission Lines Using Lumped Elements and Their Applications

2016 ◽  
Vol 64 (12) ◽  
pp. 4352-4361 ◽  
Author(s):  
Dong-Sik Eom ◽  
Hai-Young Lee
Keyword(s):  
Transmission Lines ◽  
Substrate Integrated Waveguide ◽  
Lumped Elements ◽  
Waveguide Transitions ◽  
Planar Transmission Lines

scholarly journals Transition from Microstrip Line to Ridge Empty Substrate Integrated Waveguide Based on the Equations of the Superellipse

2020 ◽  
Vol 10 (22) ◽  
pp. 8101
Author(s):  
David Herraiz ◽  
Héctor Esteban ◽  
Juan A. Martínez ◽  
Angel Belenguer ◽  
Santiago Cogollos ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Microstrip Line ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Substrate Integrated Waveguide ◽  
Fractional Bandwidth ◽  
Low Profile ◽  
Metal Layers ◽  
Planar Transmission Lines ◽  
Wideband Transition

In recent years, multiple technologies have been proposed with the aim of combining the characteristics of traditional planar and non-planar transmission lines. The first and most popular of these technologies is the Substrate Integrated Waveguide (SIW), where rows of metallic vias are mechanized in a printed circuit board (PCB). These vias, together with the top and bottom metal layers of the PCB, form a channel for the propagation of the electromagnetic fields, similar to that of a rectangular waveguide, but through a dielectric body, which increases the losses. To reduce these losses, the empty substrate integrated waveguide (ESIW) was recently proposed. In the ESIW, the dielectric is removed from the substrate, and this results in better performance (low profile and easy manufacturing as in SIW, but lower losses and better quality factor for resonators). Recently, to increase the operational bandwidth (monomode propagation) of the ESIW, the ridge ESIW (RESIW) and a transition from RESIW to microstrip line was proposed. In this work, a new and improved wideband transition from microstrip line (MS) to RESIW, with a dielectric taper based on the equations of the superellipse, is proposed. The new wideband transition presents simulated return losses in a back-to-back transition greater than 20 dB in an 87% fractional bandwidth, while in the previous transition the fractional bandwidth was 82%. This is an increment of 5%. In addition, the transition presents simulated return losses greater than 26 dB in an 84% fractional bandwidth. For validation purposes, a back-to-back configuration of the new transition was successfully manufactured and measured. The measured return loss is better than 14 dB with an insertion loss lower than 1 dB over the whole band.

Novel transition between different configurations of planar transmission lines

2002 ◽  
Vol 12 (4) ◽  
pp. 128-130 ◽  
Author(s):  
A.M.E. Safwat ◽  
K.A. Zaki ◽  
W. Johnson ◽  
C.H. Lee
Keyword(s):  
Transmission Lines ◽  
Planar Transmission Lines

Novel rat-race coupler design of arbitrary coupling coefficient using substrate integrated waveguide cavity

2018 ◽  
Vol 10 (8) ◽  
pp. 861-869 ◽  
Author(s):  
Min-Hua Ho ◽  
Yi-Hao Hong ◽  
Jen-Chih Li
Keyword(s):  
Transmission Lines ◽  
Coupling Coefficient ◽  
Substrate Integrated Waveguide ◽  
Cavity Field ◽  
Arbitrary Coupling ◽  
Degenerate Mode ◽  
Quarter Wavelength ◽  
Small Phase ◽  
Hybrid Coupler ◽  
Degenerate Modes

AbstractThe contribution of this paper is to propose a novel rat-race hybrid coupler of arbitrary coupling coefficient. Traditionally, the rat-race hybrid couplers are built by various loop-alike transmission-lines of multiple quarter-wavelength, and in this paper, we approach the coupler design by using a circular substrate integrated waveguide (SIW) cavity (SIWC). The employed SIWC supports two mutually orthogonal degenerate modes, and cavity field is formed by the two modes in an arbitrary weighting ratio which defines the proposed rat-race coupler's coupling coefficient. The cavity is excited by a microstrip combined coupling slot with the microstrip along a specifically chosen direction. The energy of each degenerate mode can be solely extracted by an associated subminiature version A (SMA) whose position is carefully determined. The isolation between the coupling slots is assured by their perpendicular layout, and the isolation between the SMA probes is obtained by the orthogonality of the two degenerate modes. Experiments are conducted on the 3- and 10-dB coupling coefficient samples to verify this novel rat-race coupler design. The measurements agree well with the simulations, and circuit's good performance is observed in terms of coupling precision, isolations, and small phase imbalances.

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