Novel Substrate-Integrated Waveguide Phase Shifter and its Application to Six-Port Junction

In this paper, a band-stop filter in Ka band is proposed, which is based on substrate integrated waveguide(SIW) resonators and complementary split ring resonators(CSRR). The SIW resonators filter is provided with high pass characteristics. We show that near the resonance point, the impedance characteristics is significantly increased by CSRR. Therefore, we can combine the SIW resonators and CSRRs to change the high pass characteristics and significantly improve the rejection level of the stop-band by etching CSRRs on the top layer in the SIW resonators. The simulated insertion loss of the filter is around 𢀒 1dB and the return loss is less than 𢀒15dB at the frequency range of 26 to 29 GHz and 32.5 to 36 GHz. In addition, the rejection level is above 𢀒20dB from 29.5 to 32GHz.

In this paper, a slotted substrate integrated waveguide (SIW) is used to create a balanced phase shifter with wideband common-mode (CM) suppression. Differential-mode (DM) impedance matching and CM suppression are achieved by utilizing the fact that TE20 mode and TE10 (TE30) mode can only transmit DM signals and CM signals, respectively, and by increasing the bandwidth for CM suppression via slots. Furthermore, a wideband phase shift with low phase deviation can be obtained due to the phase slop counteract between the slot and the delay line. Compared with the state-of-the-art, the proposed one has the advantages of wideband CM suppression, wide phase shift range, and a simple and easy-to-make structure. Five prototypes covering the frequency of 3.5 GHz are designed with the relative operating bandwidth for 45° ± 2° (90° ± 4.5°, 135° ± 6°, and 180° ± 8°) phase shifter of 20% (20%, 20%, and 20%), with the minimum insertion loss of 0.41 dB (0.5 dB, 0.58 dB, and 0.59 dB), with the minimum return loss greater than 15 dB, and with the relative bandwidth for 15-dB CM suppression of 59% (59%, 58%, and 57%).

In this work, a new electrically reconfigurable substrate integrated waveguide (SIW) phase shifter is proposed. The proposed structure uses a single PCB layer and does not require wire bounding for the bias circuit. Its principle consists in the integration, in the SIW, of several transverse CPW lines, each one is connecting a post, a PIN diode and a radial stub. Numerical results are presented to validate this concept. With the proposed design, for the two states of the PIN diodes (ON and OFF), broadband matching is obtained and a relatively constant phase difference is achieved in a broad frequency band.

In this paper, a new structure combining substrate integrated waveguide (SIW) resonator and complementary split-ring resonator (CSRR) is proposed, which is used to measure the permittivity of low-loss materials in C-band. The resonant frequency of the SIW resonant cavity is affected by the material by inserting materials into the center of the SIW resonant cavity. The inverse problem of obtaining permittivity is solved by artificial neural network. Simulation results show that by adding CSRR structure to both sides of the SIW resonator, the resonant frequency of the resonator cavity will change greatly. The measurement sensitivity of SIW resonator with CSRR structure is always higher than that of ordinary SIW resonator.

Substrate Integrated Waveguide)와 상보적 분할링 공진기(CSRR: Complementary Split Ring Resonator)를 기반으로 한 전기적으로 작은 안테나를 제안한다.안테나의 전기적 크기는 CSRR 과 기존 SIW의 1/8크기인 Eighth-Mode Substrate Integrated Waveguide(EMSIW)를 적용하여 줄일 수 있었다.EMSIW는 기존의 SIW와 비교하였을 때

In this paper, a size-reduced evanescent mode substrate integrated waveguide (SIW) bandpass filter loaded with mixed-coupled complementary split-ring resonators (CSRRs) pair is presented. In the conventional SIW-CSRR resonator with face-to-face CSRRs, a transmission zero (TZ) at the upper stopband can be generated by the mixed coupling between the SIW and CSRRs. Meanwhile, contributed from the evanescent mode characteristics, the electrical size of the resonator is miniaturized, so that its physical size can be reduced as well. By adding a slot between the splits of the two CSRRs to combine them together, a dual-mode resonator is proposed, in which the cross coupling scheme is formed to generate an extra TZ at the lower stopband of the proposed resonator to improve its selectivity performance notably. Meanwhile, owing to the proposed dual-mode resonator performing evanescent mode operation, it can keep miniaturized size simultaneously. To verify the aforementioned idea, a size-reduced bandpass filter based on the proposed resonator is realized. Experimental results shows that good performance and compact size are achieved, which indicates the proposed work is promising in practical microwave applications.

A novel composite right-/left-handed transmission line (CRLH TL) and its equivalent circuit model are proposed based on cascaded complementary single split ring resonator (CCSSRR). It features an intrinsically balanced wider band and an additional transmission zero above the right-handed band relative to CRLH TL using complementary single split ring resonator and complementary split ring resonators. Moreover, two single negative (SN) metamaterial (MTM) TLs constructed by using complementary electric inductive-capacitive resonator on the conductor strip and on the ground, respectively, are researched. Both SN MTM TLs exhibit electric resonance above the fundamental magnetic resonance. For application, a monoband (MB) bandpass filter (BPF) covered WLAN band, and a dual-band (DB) BPF covered satellite DMB band and WiMAX band are designed, fabricated, and measured. The SN MTM TLs are adopted for the sake of deep and wide out-of-band suppression while CRLH MTM TLs using square-shaped and Sierpinski-shaped CCSSRR are critical factors of the MB and DB behavior. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012. © 2012 Wiley Periodicals, Inc.

A novel dual-band bandpass SIW filter loaded with modified dual-CSRRs and Z-shaped slot

This paper explores the usefulness of RF MEMS and reconfigurable antennas in the context of modern communication systems and other applications. Simulation studies on a fractal antennas with switches and phase shifters provide beam steering and beam scanning characteristics. A brief description of the design aspects of two MEMS based coplanar waveguide (CPW) phase shifters for microwave and millimeter wave antenna applications are also provided here. One phase shifter design consists of a unique bilateral interdigital structure on a silicon substrate deposited with a thin film of electrically tunable barium strontium titanate. The dielectric constant of the thin film, and hence the effective permittivity of the transmission line changes by the application of a bias voltage. The second device is a distributed microelectromechanical system (MEMS) phase shifter fabricated on a high resistivity silicon substrate using microstereolithography technique is presented here. The distributed MEMS phase shifter consists of a high-impedance CPW transmission line and several MEMS bridges of uniform height. By applying a voltage the height of these bridges can be adjusted. This results in a variation in the distributed capacitance of the segment of the transmission line, which manifests in the phase shift at the output terminal. The fabrication procedure described here shows significant promise for the use of microstereolithography techniques for RF MEMS devices.

This paper introduces compact Printed Ridge Gap Waveguide (PRGW) phase shifters tailored for millimeter-wave applications, with a focus on achieving wide operating bandwidth, and improved matching and phase balance compared to single-layer technology. This study proposes a unique approach to achieve the required phase shift in PRGW technology, which has not been previously explored. This study also introduces a novel analytical approach to calculate the cutoff frequency and propagation constant of the PRGW structure, a method not previously addressed. Furthermore, the utilization of multi-layer PRGW technology enables the realization of multi-layer beamforming networks without crossing, thereby supporting wideband operation in a compact size. The proposed design procedure enables the realization of various phase shift values ranging from 0∘ to 135∘ over a broad frequency bandwidth centered at 30 GHz. A 45-degree phase shifter is fabricated and tested, demonstrating a 10 GHz bandwidth (approximately 33% fractional bandwidth) from 25 GHz to 35 GHz. Throughout the operating bandwidth, the phase balance remains within 45 ± 5∘, with a deep matching level of -20 dB. The proposed phase shifter exhibits desirable characteristics, such as compactness, low loss, and low dispersion, making it a suitable choice for millimeter-wave applications, including beyond 5G (B5G) and 6G wireless communications.

This paper presents a novel compact dual-band and dual-polarized complementary split-ring resonator (CSRR)-fed substrate-integrated waveguide (SIW) cavity-backed fractal patch antenna for wireless energy harvesting and communication. The proposed antenna is composed of a Giuseppe Peano fractal radiation patch with a backed SIW cavity. To enhance the bandwidth and minimize the dimensions, the CSRR structure is designed to feed the Giuseppe Peano fractal patch orthogonally. A prototype of the proposed antenna is simulated, fabricated and measured. The proposed antenna exhibits good directionality and high cross-polarization level with especially compact size.

A new idea of Substrate integrated waveguide (SIW) based digital phase shifter by controlling the transverse slots etched over the top metallic surface of SIW is proposed. A PIN diode is mounted on each transverse slot. Slots are made “enabled” or “disabled” by switching the state of PIN diode. A detailed explanation and demonstration is presented in this paper. As a result, a digital four bit phase shifter can be realized. Furthermore, equivalent circuit model for proposed device has also been discussed. Insertion loss is as low as 1.5 dB for a wide bandwidth of 31% (6.75–9.25 GHz), with a phase imbalance of ±4° and amplitude imbalance of ±0.5 dB. Simulation results agree well with the measured results.

We present a new bandpass filter by combining an isosceles right‐triangle substrate integrated waveguide (SIW) cavity with a complementary split ring resonator (CSRR) together. The first and second modes of the SIW cavity are used to form a desirable passband with the help of a perturbation metallic via‐hole. We introduce a CSRR at the ground plate of the SIW cavity to produce two controllable transmission zeros at the upper stopband, which improve the upper stopband characteristic greatly. Moreover, at the lower stopband, we make use of a pair of T‐shape stub‐loaded resonators to generate a transmission zero, and thus improve the out‐of‐band rejection greatly. To validate our design scheme, a filter sample has been fabricated and measured. The measured results and simulation ones are in good agreements. The filters show advantages of compactness, sharp stopband rejection, high frequency‐selectivity, and controllable passband and transmission zeros.

In this paper, a substrate integrated waveguide (SIW) bandpass filter using defected ground structure (DGS) with complementary split ring resonators (CSRRs) is proposed. By using the unique resonant properties of CSRRs and DGSs, two passbands with a transmission zero in the middle have been achieved. The resonant modes of the two passbands are different and the bandwidth of the second passband is much wider than that of the first one. In order to increase out-of-band rejection, a pair of dumbbell DGSs has been added on each side of the CSRRs. The structure is analyzed using equivalent circuit models and simulated based on EM simulation software. For validation, the proposed filter is fabricated and measured. The measurement results are in good agreement with the simulated ones.

This paper presents a novel structure for designing compact multiple passband filters based on circular cavity substrate integrated waveguide (SIW) loaded with complementary split ring resonators (CSRRs). CSRRs of asymmetric semicircular geometry are introduced to generate multiple passbands. Dual passband and quadruple passband are designed and generated below the waveguide cutoff frequency with significant stopband rejection, good selectivity and compactness. The resonating frequencies of the passband can be independently controlled just by varying the dimensions of the loaded CSRRs.