Ka band band-stop filter based on complementary split ring and SIW resonators

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.

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.

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 recent years, various types of new shielding structures realizing shielding effectiveness (SE) at specific frequency band have been reported. A gasket-free shielding structure using cascaded substrate integrated waveguide (SIW) resonators is one of them. The structure consists of cascaded SIW resonators with different resonant frequencies placed on inner walls of a gap. Though the structure has an advantage of being almost free of deterioration due to its non-contact structure, miniaturization of the SIW resonators is necessary to be applied at several GHz bands. In this paper, a gasket-free shielding structure using folded quarter-wavelength (FQ)-SIW resonators is proposed and its SE is evaluated. An FQ-SIW resonator is a miniaturized SIW resonator by applying a multilayer substrate and modifying position of the coupling slits. A prototype configuration for 2.4 GHz band is designed and fabricated using a five-layered FR4 substrate. The designed FQ-SIW resonators are miniaturized to almost 1/7 of conventional SIW resonators, and the measured results of the cascaded configuration showed more than 30-dB improvement of SE at 2.4 GHz band.

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

we report our investigation on third harmonic generation (THG) in the terahertz (THz) regime using double resonant frequency selective metasurface composed of square-shaped periodic complementary single split ring resonators.

ABSTRACTIn this letter, a novel microstrip patch antenna is designed with the use of both split ring resonator (SRR) and complementary split ring resonator (CSRR). The use of SRR and CSRR in the substrate and base material, respectively, have changed the behavior of the material and now it acts as metamaterial. Metamaterials exhibit new electromagnetic response functions that cannot be found in nature. The addition of SRR and CSRR in the regular patch changes the permeability (µ) and the permittivity (ε) of the material. Due to the change in these two properties of the material the resonance changes and now patch design shows the multiband result. Here the design shows three bands with its center frequencies 3.31, 3.88, and 4.61 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2219–2222, 2013

A compact substrate integrated waveguide (SIW) bandpass filter with wide stopband, high selectivity and tunable transmission zero with open ended stub is proposed. The complementary split ring resonator (CSRR) is etched on the top layer and defected ground structure (DGS) is carved on the bottom layer to enhance the skirt selectivity of the band pass filter and suppress the higher order modes to exhibit wide stopband. A pair of open-ended stubs are inserted at port 2 to improve the upper stopband selectivity. Tuning the stub length enhances electric coupling and shifts the transmission zero thereby improving the out- of- band rejection on the upper sideband. The measured passband center-frequency, minimum insertion loss, return loss, 3 dB bandwidth and fractional bandwidth are 10.1 GHz, 1.52 dB, 15 dB, 2.71 GHz (8.75–11.46 GHz) and 23.8% respectively. To validate the design, the prototype was fabricated and measured, and the measured results are in good agreement with the simulated responses.

A folded multiple-mode resonator (FMMR) with complementary split ring resonator (CSRR), defected ground structures (DGS) and inter-digital couple is introduced for ultra-wideband bandpass filter design in this paper. The wider bandwidth (3.1 to 9.8 GHz) with FBW = 126 %, lower insertion loss (0.26 dB), and higher rejection level (-44 dB) of UWB band at central frequency f0 = 5.6 GHz are presented. By using the CSRR and inter-digital couple, three notch responses can exist in the UWB passband for blocking the interference signals. Adjusting the size factor of CSRR and inter-digital couple, the wide tuning ranges of notch frequencies included the desired frequencies of 5.18/6.10/8.08 GHz are achieved. The wide tuning ranges of two notch frequencies cover from 5.0 GHz to 8.4 GHz. It is a simple way to control the notch response.

A complementary split-ring resonator (CSRR)-loaded substrate-integrated waveguide (SIW) phase shifter and its application to a six-port junction is presented and demonstrated in this article. Different from the prior evanescent-mode analysis, this article concentrates on the TE10-mode analysis of CSRR-loaded SIW, and a slow-wave effect is observed. The CSRR offers a simple resolution to a slow-wave structure in SIW and can be verified by the CSRR equivalent-circuit model theory. Hence, an equal-length wideband 90° phase shifter (35%) can be realized by a proper design of the fast-slow-wave hybrid transmission line (TL). The phase velocity decrease caused by the slow-wave effect contributes to the length reduction of the phase shifter as well and makes it more compact. Furthermore, the widespread application of CSRR also helps generalize the slow-wave effect, and a more compact phase- shifter-based half-mode substrate-integrated waveguide (HMSIW) is obtained. To experimentally validate this concept, a dual-layer six-port- junction-based HMSIW is designed, simulated, and fabricated. The application of the slow-wave TL in a six-port design helps in the bandwidth enhancement and size reduction of the component, which makes it more applicable to demanding systems with complex requirements such as detecting and transceiver systems. The measured results are in accordance with the simulated data.

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, we present a new design of miniaturized printed microstrip antenna based on Complementary Split ring resonators (CSRR) as main radiators. The antenna is composed of a pair of CSRRs etched on the ground plane and excited by an open-ended microstrip line feed symmetrically placed between the two CSRRs at the upper substrate side. To enhance the inherently CSRRs limited bandwidth; two rectangular slots are introduced in the vicinity of each CSRR resulting in a significant bandwidth improvement and also in lowering the operating frequency. The resonance frequency of the antenna is essentially defined by geometrical parameters of the CSRR, which makes it suitable for a broad range of applications spanning from mobile terminals to WLAN and WPAN systems. The proposed structure has been studied numerically by using CST Microwave studio.

In this paper, two band-stop Substrate Integrated Waveguide (SIW) filters based on Square Complementary Split Ring Resonators (CSRRs) were presented for X-band applications by etching SCSR Resonators on the surface of the substrate integrated waveguide. Two topologies of the band stop filter are treated. The first toplogy concerns the use of one square ring CSRR are etched in the top plane of the SIW, the second includes three square rings CSRRs. All the structures are designed on a single substrate RT / Duroid 5880 with permittivity e r = 3.48 and tangential losses (tg(δ) = 0.0009). Numerical calculations using the Finite Element Method (MEF) based the High Frequency Structure Simulator (HFSS) software are presented to design this filter

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.