Wideband double layer Substrate Integrated Waveguide directional coupler

A compact dual‐mode substrate‐integrated waveguide (SIW) bandpass filter with wide upper stopband is presented. A cross shaped slot is etched on the top plane of SIW cavity to alter the second mode (TE201) current distribution and move it closer to the first mode (TE101), to enhance the bandwidth flatness. Removing few via near the excitation ports, provides longer path for the current to resonance and give us the transmission zeros (TZ1) in a simple way. Another 2 TZs are used to improve the stopband by suppressing higher order modes resonances. The designed filter is fabricated and tested and a very good result is achieved to confirm the design idea. There is also a good agreement between the measured and Full Wave simulated results. The fabricated sample realizes a fractional bandwidth of 9.1% at 7.5 GHz center frequency and 2 zeros at 12.5 GHz and 15 GHz.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel compact dual‐mode SIW filter with wide rejection band and selective response

Mahan

Pourjafari

Tayarani

et al. 2018

“…, narrow band couplers with 2 slots are introduced and coupling degree can be controlled by the direction and the length of the slots. However, during the research, we find the prior designs are mostly weak coupling couplers utilizing Bethe hole coupling theory and strong coupling couplers are seldom mentioned. The reason is presented as follow: the distance between adjacent apertures is settled to be one‐fourth of the operating wave length, which limits the radius of aperture.…”

Section: Introductionmentioning

confidence: 99%

Minimized multi‐layer substrate integrated waveguide 3‐dB small aperture coupler

Shui

2017

A multi‐layer 3‐dB substrate integrated waveguide coupler is presented in this article. As a promising technique, the multi‐layer substrate integrated waveguide has been widely used in microwave and millimeter circuits and systems for its decrease in size. This design combines the Bethe hole coupling theory with the SIW technology to reduce the height and integrate with other planar circuits. More importantly, the strong coupling (3‐dB) coupler presented in this article utilizes the higher frequency band of TE10 mode to get a relatively bigger radius of aperture and in turn reduce the number of coupling sections, which significantly decrease the size of the coupler. The simulated results are in good agreement with the measured data.

“…Coupling is generally achieved using apertures, parallel and cross slots over the entire width of the common conducting wall of the two adjacent SIW structures. The configuration of 10‐dB coupler with six pairs of apertures , 3‐dB coupler with 14 rows of paired circular apertures , 20‐dB coupler with 10 rows , and another in which a 20‐dB directional coupler in the X‐band using the traditional coupling theory and Tchebychev method are found in the literature. However, the number of apertures has affected the size of those couplers.…”

Section: Introductionmentioning

confidence: 99%

Design of a multilayered six‐aperture directional coupler using substrate integrated waveguide

Mbaye

Talbi

Hettak

2013

The design of a six‐aperture, 10‐dB directional coupler using substrate integrated waveguide is presented. Size constraints precluded addition of holes in series, however, in parallel the addition enhanced performance without increasing size. Here, 10‐dB coupling with ±2‐dB coupling ripple and reflection coefficient exceeded that of 15 dB over 34% of bandwidth. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:23–27, 2014