Substrate integrated folded waveguide controllable mixed electric and magnetic coupling structure and its application to millimetre-wave pseudo-elliptic filters

Li, Xiang; You, Changjiang; Yu, Hongfang; He, Zhaosheng

doi:10.1002/mmce.21074

Cited by 8 publications

(14 citation statements)

References 24 publications

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“…Different in‐band transmission is observed according to the orientations of the CSRRs. A millimeter‐wave pseudo‐elliptic filter is built by a meandered slot‐line (MSL) combined with FSIW cavity in Reference .…”

Section: Introductionmentioning

confidence: 99%

A novel wideband bandpass filter based on CSRR‐loaded substrate integrated folded waveguide

Yang

Qiang

et al. 2020

Int J RF Microw Comput Aided Eng

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A novel wideband bandpass filter based on folded substrate integrated waveguide (FSIW) is presented in the article. Five square complementary splitring resonators (CSRRs) are etched in the middle layer of the FSIW. By adjusting the physical size of the CSRR structure, the resonant frequency of the CSRRs can be tuned at the same time and the stopband performance can be changed. As transverse electromagnetic (TEM) mode can be transmitted in the stripline, FSIW excited by stripline shows wider passband than that excited by microstrip line directly. To achieve perfect impedance matching, two microstrip lines to stripline transitions are added in two ports of the filter. The proposed bandpass filter exhibits compact size, high selectivity, good stopband rejection, lower radiation loss, and wideband performances. The measured results show that the fractional bandwidth of the filter is about 35.5%. The measured return loss is better than 15 dB from 4.84 GHz to 6.90 GHz, and the insertion loss is less than 1.2 dB. The comparison between the simulated results and the measured ones validate the possibility of the technology that combines the FSIW and CSRR. K E Y W O R D Sbandpass filter, compact size, complementary split-ring resonators (CSRRs), folded substrate integrated waveguide, radiation loss

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Section: Introductionmentioning

confidence: 99%

A novel wideband bandpass filter based on CSRR‐loaded substrate integrated folded waveguide

Yang

Qiang

et al. 2020

Int J RF Microw Comput Aided Eng

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“…Current miniaturized SIW tunable resonators are mostly HMSIW (Half‐mode substrate integrated waveguide) structures or QMSIW (Quarter‐mode substrate integrated waveguide) structure, the size is still larger than the microstrip structure. Folding technology is widely used in the research of filter miniaturization, but there are few studies on the application of tunable filter in miniaturization. Moreover, the current miniaturized folding technology mostly adopts asymmetric folding, and there are few reports on symmetrically folded SIW technology.…”

Section: Introductionmentioning

confidence: 99%

A novel symmetrical folding miniaturized substrate integrated waveguide tunable bandpass filter

Zuo

Zhu

Cheng

et al. 2019

Int J RF Microw Comput Aided Eng

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In order to improve the utilization of spectrum resources, dynamic frequency allocation technology has become a method of spectrum saving. The research of electric tunable filter has received much attention in recent years. Substrate integrated waveguide (SIW) is a new technology of microwave integration in the field. The innovation of this article is to combine the SIW miniaturization technology with tunable technology. In this article, a miniaturized symmetrically folded substrate integrated waveguide (SFSIW) filter is designed. Based on the miniaturization of SIW filter, the center frequency can be adjusted electrically and the measured data show that the tunable filter can achieve eight states under the condition that the bandwidth below −3 dB remains approximately constant 300 MHz. The center frequency varies from 3.23 GHz to 3.9 GHz. The range of the filter's insertion loss is 1.2 dB to 2.04 dB, and the return loss is higher than 20.9 dB. This filter has practical value in the electronic countermeasures of military communication.

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“…In general, RMs and TZs can be generated by a source-load coupling, cross-coupling, or bypass coupling topologies, with the possibility of electric and magnetic coupling. In recent years, different studies investigated coupling-based radiofrequency (RF) applications [6][7][8][9][10][11]. For instance, in a planar filter structure, the number and positions of TZs can be controlled using a mixed electric-magnetic coupling, thus improving the rejection level [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, in a planar filter structure, the number and positions of TZs can be controlled using a mixed electric-magnetic coupling, thus improving the rejection level [6][7][8]. In addition, a substrate-integrated folded waveguide structure was proposed to achieve the required electric-magnetic coupling [9]. A similar scheme was applied to power divider designs, by facilitating the second-harmonic suppression [10] and in-band isolation [11].…”

Section: Introductionmentioning

confidence: 99%

Integrated passive device fabricated and chip‐on‐board packaged filter employing mixed electric–magnetic coupling scheme

Liang

Kim

2018

IET Microwaves, Antennas & Propagation

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Compact and high‐performance radio‐frequency devices require several optimisation processes in the design, fabrication, and packaging, as well as a thorough reliability verification. The authors propose a compact planar dual‐band bandpass filter comprising mixed electric–magnetic coupling open‐loop resonators. To increase the coupling performance and minimise the structure size, the resonators were topologically optimised into both external stepped‐impedance resonators and internal half‐wavelength spiral resonators. Besides the electric length of the resonators, the centre frequencies and transmission zeros were tuned to the desired values by controlling the coupling coefficients and quality factors. Moreover, in their design, the in‐band flatness and bandwidth can also be adjusted. To validate their approach, they fabricated a filter on a gallium arsenide substrate using the advanced‐integrated passive device process. Then, the filter was packaged by attaching it to a printed circuit board using a chip‐on‐board technique. The measurement results were consistent with those obtained from a simulation. A series of tests verified that the utilised fabrication and packaging techniques notably enhance the device reliability and its long‐term stability even in harsh environments.

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Substrate integrated folded waveguide controllable mixed electric and magnetic coupling structure and its application to millimetre-wave pseudo-elliptic filters

Cited by 8 publications

References 24 publications

A novel wideband bandpass filter based on CSRR‐loaded substrate integrated folded waveguide

A novel wideband bandpass filter based on CSRR‐loaded substrate integrated folded waveguide

A novel symmetrical folding miniaturized substrate integrated waveguide tunable bandpass filter

Integrated passive device fabricated and chip‐on‐board packaged filter employing mixed electric–magnetic coupling scheme

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