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Proceedings ArticleDOI

Dual-band substrate integrated waveguide filter with independently controllable bandwidth

TL;DR: In this article, a dual-band bandpass filter is proposed in substrate integrated waveguide (SIW) technology, where a single cavity that supports both TE 101 and TE 201 resonating modes is used for the design.
Abstract: In this paper, a dual-band bandpass filter is proposed in substrate integrated waveguide (SIW) technology A single cavity that supports both TE 101 and TE 201 resonating modes is used for the design The two passbands are created by the two modes To improve the selectivity, one bypass coupling path is introduced which provides additional transmission zero The procedures to control the passband center frequencies as well as their bandwidths are presented A prototype narrowband bandpass filter with the center frequencies of two passbands as 10 GHz and 11 GHz is fabricated for space applications The 3 dB fractional bandwidths are 3% and 16%, respectively The measured insertion losses at the passband center frequencies are 14 dB and 26 dB, respectively
Citations
More filters
Journal ArticleDOI
TL;DR: In this paper, a highly selective narrowband bandpass filter (BPF) is presented in substrate integrated waveguide (SIW) technology, where higher order TE301 resonators are used to utilize their high unloaded Q-factors.
Abstract: In this letter, a highly selective narrowband bandpass filter (BPF) is presented in substrate integrated waveguide (SIW) technology. Higher order TE301 resonators are used to utilize their high unloaded Q-factors. A midline feeding scheme together with a bypass coupling provides three transmission zeros (TZs). Two of the zeros can be placed at band edges for high selectivity. A three-pole BPF with 3-dB fractional bandwidth of 1.1% at $f_{\mathrm {\mathbf {0}}} = 8.25$ GHz is fabricated. It provides at least 35-dB attenuation over 2 GHz above and below the passband starting from $f_{0} \pm 0.15$ GHz.

37 citations


Cites background from "Dual-band substrate integrated wave..."

  • ...variations of higher order resonant modes along W [12]....

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  • ...Relative positions of the resonant frequencies of different modes can be tuned to some extent by the width to length ratio W /L of the resonator [12]....

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Journal ArticleDOI
TL;DR: In this paper, two compact planar substrate integrated waveguide (SIW) cavity-backed antennas are proposed for wireless local area network (WLAN) at 5.5 GHz and wireless body area networks (WBAN), respectively.
Abstract: In this paper, two compact planar substrate integrated waveguide (SIW) cavity-backed antennas are proposed for wireless local area network (WLAN) at 5.5 GHz and wireless body area network (WBAN) at 5.8 GHz. The miniaturization is achieved with the concept of quarter-modetopology, and the size of the cavity is reduced up to one-fourth of the circular SIW cavity. A L-shaped slot is etched on the top plane for miniaturization, and antenna-1 is realized which resonates at 5.5 GHz. A metal strip has been added in the middle section of the slot, and antenna-2 is realized, which resonates at 5.8 GHz. Both proposed antennas are tested in free space, while the performance of antenna-2 is investigated for on-body condition. In free space, the measured impedance bandwidths of the antenna are 160 MHz and 210 MHz at 5.5 GHz and 5.8 GHz, respectively. The radiation efficiency of the antenna is 89.4% in free space and 57% on phantom at 5.8 GHz. Both measured and simulated results are observed, and they are in a good agreement.

15 citations


Cites background from "Dual-band substrate integrated wave..."

  • ...In the past decade, several microwave passive components have been developed in SIW technology by deploying its advantage of high-quality-factor [9, 10]....

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Proceedings ArticleDOI
05 Apr 2023
TL;DR: In this paper , a planar inverted L-shaped antenna is proposed to reduce the antenna footprint by 50% by bisecting the full-mode cavity along the magnetic wall.
Abstract: This article presents a compact size Inverted Lshaped antenna for wireless applications like WLAN and commercial WI-FI applications. The proposed design uses Half Mode Substrate Integrated Waveguide (HMSIW) technology to reduce antenna footprint by 50%, achieved by bisecting the fullmode cavity along the magnetic wall. Further, the miniaturization has been achieved by around 25% by introducing an inverted L-shaped slot on the top cladding of the HMSIW cavity. After introducing the slot, the frequency is reduced to 2.45 GHz from 5.3 GHz. Hence, the overall footprint of the antenna has been reduced to 75%. By using the SIW technology, the cavity-backed antenna is realized in a planar form, also it retains the features of the full-mode cavity. The antenna is designed on RT Duroid 5880 with a substrate thickness of 1.575 mm and a dielectric constant of 2.2. The proposed antenna resonates at 2.45 GHz with a fractional bandwidth of 2.6%. The antenna’s directivity is obtained at 4.91 dBi at the operating frequency. The proposed antenna depicts a unidirectional radiation pattern with a front-to-back ratio (FTBR) of 12.75 dBi. The proposed geometry is low-profile, planar, and compact in nature which can be easily integrated into a hand-held device.
Proceedings ArticleDOI
12 Dec 2022
TL;DR: In this paper , a second-order dual-band bandpass filter with the Chebyshev response is designed with the two passbands designated at 10.1 − 10.2 GHz and 10.4 - 10.5 GHz with fractional bandwidth (FBW).
Abstract: This paper presents the design of substrate integrated waveguide (SIW) based multi-band filter using the frequency transformation approach. The steps involved in the extraction of coupling matrix elements and the equivalent circuit model for the generalized multi-band filter design are briefly explained. To validate the synthesis method presented in this paper a second-order dual-band bandpass filter is designed with the Chebyshev response. The two passbands are designated at 10.1 – 10.2 GHz and 10.4 – 10.5 GHz with fractional bandwidth (FBW) of 0.985% and 0.957% respectively. The maximum return loss for each passband is 20 dB. Very good agreements are achieved between theoretical responses and full-wave simulations.
References
More filters
Journal ArticleDOI
TL;DR: In this article, a new method of analysis is presented for the determination of complex propagation constants in substrate integrated waveguides (SIWs) by making use of the concept of surface impedance to model the rows of conducting cylinders, and the proposed model is then solved by combining a method of moments and a transverse resonance procedure.
Abstract: A new method of analysis is presented in this paper for the determination of complex propagation constants in substrate integrated waveguides (SIWs) This method makes use of the concept of surface impedance to model the rows of conducting cylinders, and the proposed model is then solved by combining a method of moments and a transverse resonance procedure The proposed method is further applied to extract results in terms of parametric curves and graphs which demonstrate fundamental and interesting wave guidance and leakage properties of this type of periodic waveguide Useful design rules are extracted from this analysis, suggesting that appropriate design parameters and regions should be carefully selected for practical applications In addition, comprehensive review and comparisons with published results are also presented to show the performance and accuracy of the proposed modeling technique Practical measurements of fabricated samples with different levels of loss have confirmed the accuracy of this new method and validity of design rules

765 citations


"Dual-band substrate integrated wave..." refers background or methods in this paper

  • ...Via diameter d and center to center distance between two successive vias p of the SIW resonator are calculated from [1]....

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  • ...Also it is more compact than air filled waveguide [1]-[2]....

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Journal ArticleDOI
TL;DR: In this article, a planar negative coupling scheme including a magnetic coupling post-wall iris and a balanced microstrip line with a pair of metallic via-holes is studied in detail.
Abstract: Substrate integrated waveguide (SIW) technology provides an attractive solution to the integration of planar and nonplanar circuits by using a planar circuit fabrication process. However, it is usually difficult to implement the negative coupling structure required for the design of compact canonical folded elliptic or quasi-elliptic cross-coupled bandpass filter on the basis of a single-layer SIW. In this paper, a special planar negative coupling scheme including a magnetic coupling post-wall iris and a balanced microstrip line with a pair of metallic via-holes is studied in detail. Two -band fourth-degree cross-coupled bandpass filters without and with source-load coupling using the negative coupling structures are then proposed and designed. The two novel SIW filters having the same center frequency of 20.5 GHz and respective passband width of 700 and 800 MHz are implemented on a single-layer Rogers RT/Duroid 5880 substrate with thickness of 0.508 mm. Measured results of those filters, which exhibit a high selectivity, and a minimum in-band insertion loss of approximately 0.9 and 1.0 dB, respectively, agree well with simulated results.

311 citations


"Dual-band substrate integrated wave..." refers background in this paper

  • ...Resonance frequency tuning The resonance frequency of TEm0n mode of a SIW resonator is [14]...

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Journal ArticleDOI
TL;DR: In this paper, the synthesis and design techniques of dual-and triple-passband filters with Chebyshev and quasi-elliptic symmetric frequency responses are proposed and demonstrated for the first time on the basis of substrate integrated waveguide technology.
Abstract: In this paper, synthesis and design techniques of dual- and triple-passband filters with Chebyshev and quasi-elliptic symmetric frequency responses are proposed and demonstrated for the first time on the basis of substrate integrated waveguide technology. The inverter coupled resonator section is first investigated, and then a dual-passband Chebyshev filter, a triple-passband Chebyshev filter, and a dual-passband quasi-elliptic filter, which consist of the inverter coupled resonator sections, are synthesized from the generalized low-pass prototypes having Chebyshev or quasi-elliptic responses, respectively. Subsequently, theses filters with a symmetric response are designed and implemented using the substrate integrated waveguide scheme over the -band frequency range. The inverter coupled resonator sections composed of side-by-side horizontally oriented substrate integrated waveguide cavities are coupled, in turn, by post-wall irises. 50-Omega microstrip lines are used to directly excite the filters. Measured results are presented and compared to those simulated by Ansoft's High Frequency Structure Simulator (HFSS) software package. A good agreement between the simulated and measured results is observed, which has also validated the proposed concept of design and synthesis with the substrate integration technology.

250 citations


"Dual-band substrate integrated wave..." refers methods in this paper

  • ...In [8], dual and triple band filters using inverter coupled resonator is reported in SIW technology....

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Journal ArticleDOI
TL;DR: In this article, the authors presented a new set of results concerning the use of higher/lower order modes as a means to implement bypass or cross coupling for applications in elliptic filter design.
Abstract: This paper presents a new set of results concerning the use of higher/lower order modes as a means to implement bypass or cross coupling for applications in elliptic filter design. It is shown that the signs of the coupling coefficients to produce a transmission zero (TZ) either below or above the passband are, in certain situations, reversed from the predictions of simpler existing models. In particular, the bypass coupling to higher/lower order modes must be significantly stronger than the coupling to the main resonance in order to generate TZs in the immediate vicinity of the passband. Planar (H-plane) singlets are used to illustrate the derived results. This study should provide very important guidelines in selecting the proper main and bypass couplings for sophisticated filtering structures. Example filters are designed, built, and measured to demonstrate the validity of the introduced theory.

197 citations


"Dual-band substrate integrated wave..." refers background in this paper

  • ...Extra transmission zero Due to the coupling between higher-lower order modes of the cavity, one single transmission zero is created in between the two passbands [16]....

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Journal ArticleDOI
TL;DR: In this paper, a dual-band differential bandpass filter with controllable differential-mode (DM) center frequencies, and high common-mode suppression as well as band-to-band isolation is proposed.
Abstract: A dual-band differential bandpass filter with controllable differential-mode (DM) center frequencies, and high common-mode (CM) suppression as well as band-to-band isolation, is proposed in this letter. The presented filter is implemented based on the substrate integrated waveguide (SIW) technology. The first DM passband can be derived by the dominant modes, while the second DM passband response can be obtained by employing the higher order modes. The center frequencies of two DM passbands can be tuned by changing the dimension parameters. To improve the CM suppression, four slotlines with different locations are etched on the top metal plane. The measured and simulated results are in good agreement.

77 citations


"Dual-band substrate integrated wave..." refers background in this paper

  • ...A dual-band differential bandpass filter with improved common mode suppression has been reported in [7]....

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