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Journal ArticleDOI

Narrowband Substrate Integrated Waveguide Bandpass Filter With High Selectivity

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.
Citations
More filters
Journal ArticleDOI
Abstract: In this letter, an on-chip bandpass filter is designed and implemented based on a 70- $\mu \text{m}$ GaAs substrate integrated waveguide (SIW) technique for W-band integrated transceiver applications. To achieve a high-frequency selectivity, a modal bypass coupling realized by higher order mode resonators is introduced in the SIW filter, and two designable transmission zeros are generated accordingly. The presented filter has a center frequency of 92.7 GHz, with a 3-dB bandwidth of about 3.2 GHz. The measured out-of-band rejection is better than 30 dB at 90 and 95 GHz, respectively.

20 citations


Cites background from "Narrowband Substrate Integrated Wav..."

  • ...The idea of using higher mode interactions in SIW to implement transmission zeros (TZs) has been already demonstrated in several works [4]–[6]....

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Journal ArticleDOI
TL;DR: In this article, a fully closed, third-order SIW filter consisting of two SIW resonators and one stripline resonator is proposed, which provides coupling path for the TE101 mode to form a passband, while the couplings for TE102 and TE201 modes are very weak, resulting in the suppression of their propagation.
Abstract: A novel method to design substrate integrated waveguide (SIW) filters with odd-order response is presented in this letter. By combining SIW and stripline technologies, a fully closed, third-order filter consisting of two SIW resonators and one stripline resonator is proposed. The stripline resonator provides a coupling path for the TE101 mode to form a passband, while the couplings for TE102 and TE201 modes are very weak, resulting in the suppression of their propagation. The principle for higher order mode suppression is carefully illustrated. On the basis of this filter, another two filters are designed by introducing different cross couplings, which generate extra transmission zeros (TZs) to enhance the selectivity. These two filters exhibit flexible response with controllable TZs. All these three filters are fabricated and measured. The measured results are in good agreement with the simulation, which validates the proposed design methodology and the idea of incorporating the stripline resonator into the SIW. They demonstrate a low insertion loss, high selectivity, and wide stopband. In addition, the proposed filters are featured by a reduced size due to the applications of the double-layer structure and miniaturized stripline resonators.

19 citations


Cites methods from "Narrowband Substrate Integrated Wav..."

  • ...SUBSTRATE integrated waveguide (SIW) technologies have been widely used for filter designs [1]–[6], and multilayered SIW filters are becoming a trend for high Q, compact size filters with good design flexibility [7]–[13]....

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Journal ArticleDOI
TL;DR: The proposed methodology allows for designing BPFs with predefined wideband or narrowband FBW by modifying the underlying physical constraints and optimization parameters, and the resulting filters are planar, compact, and have wide stopband rejection.
Abstract: In this article, an optimization-driven methodology is proposed for the design of substrate integrated waveguide (SIW) bandpass filters (BPFs) with predefined passbands. The width between the metallic walls of via-holes is governed by a truncated Fourier series to achieve the desired filtering performance. The theory of rectangular waveguide is used to establish the optimization framework and obtain the series coefficients under predefined physical constraints. Two types of end-terminations are studied; specifically, with and without SIW-to-microstrip transitions. To validate the proposed methodology, two Ku-band BPF prototypes with 2.5% and 5.8% 15-dB fractional bandwidth (FBW) are designed, simulated, and measured. Furthermore, the half-mode SIW (HMSIW) concept is incorporated in one prototype to facilitate a miniaturized physical structure. Simulations and measurements are in close proximity with passband matching and transmission losses better than -15 dB and -2.5 dB, respectively. The proposed methodology allows for designing BPFs with predefined wideband or narrowband FBW by modifying the underlying physical constraints and optimization parameters. The resulting filters are planar, compact, and have wide stopband rejection. In addition, a derivation for the characteristic impedance of the SIW line is provided, which can be used to find the optimum SIW-to-microstrip transition without performing a parametric study.

11 citations


Additional excerpts

  • ...The proposed methodology differs from other previous efforts in the following aspects: 1) Unlike [7], [11], [12], and [14], all BPF designs presented in this work occupy smaller area and has lower insertion losses due to the absence of higher-order modes of cavities and resonators....

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References
More filters
Book
01 Jan 2001
TL;DR: In this paper, the authors present a general framework for coupling matrix for Coupled Resonator Filters with short-circuited Stubs (UWB) and Cascaded Quadruplet (CQ) filters.
Abstract: Preface to the Second Edition. Preface to the First Edition. 1 Introduction. 2 Network Analysis. 2.1 Network Variables. 2.2 Scattering Parameters. 2.3 Short-Circuit Admittance Parameters. 2.4 Open-Circuit Impedance Parameters. 2.5 ABCD Parameters. 2.6 Transmission-Line Networks. 2.7 Network Connections. 2.8 Network Parameter Conversions. 2.9 Symmetrical Network Analysis. 2.10 Multiport Networks. 2.11 Equivalent and Dual Network. 2.12 Multimode Networks. 3 Basic Concepts and Theories of Filters. 3.1 Transfer Functions. 3.2 Lowpass Prototype Filters and Elements. 3.3 Frequency and Element Transformations. 3.4 Immittance Inverters. 3.5 Richards' Transformation and Kuroda Identities. 3.6 Dissipation and Unloaded Quality Factor. 4 Transmission Lines and Components. 4.1 Microstrip Lines. 4.2 Coupled Lines. 4.3 Discontinuities and Components. 4.4 Other Types of Microstrip Lines. 4.5 Coplanar Waveguide (CPW). 4.6 Slotlines. 5 Lowpass and Bandpass Filters. 5.1 Lowpass Filters. 5.2 Bandpass Filters. 6 Highpass and Bandstop Filters. 6.1 Highpass Filters. 6.2 Bandstop Filters. 7 Coupled-Resonator Circuits. 7.1 General Coupling Matrix for Coupled-Resonator Filters. 7.2 General Theory of Couplings. 7.3 General Formulation for Extracting Coupling Coefficient k. 7.4 Formulation for Extracting External Quality Factor Qe. 7.5 Numerical Examples. 7.6 General Coupling Matrix Including Source and Load. 8 CAD for Low-Cost and High-Volume Production. 8.1 Computer-Aided Design (CAD) Tools. 8.2 Computer-Aided Analysis (CAA). 8.3 Filter Synthesis by Optimization. 8.4 CAD Examples. 9 Advanced RF/Microwave Filters. 9.1 Selective Filters with a Single Pair of Transmission Zeros. 9.2 Cascaded Quadruplet (CQ) Filters. 9.3 Trisection and Cascaded Trisection (CT) Filters. 9.4 Advanced Filters with Transmission-Line Inserted Inverters. 9.5 Linear-Phase Filters. 9.6 Extracted Pole Filters. 9.7 Canonical Filters. 9.8 Multiband Filters. 10 Compact Filters and Filter Miniaturization. 10.1 Miniature Open-Loop and Hairpin Resonator Filters. 10.2 Slow-Wave Resonator Filters. 10.3 Miniature Dual-Mode Resonator Filters. 10.4 Lumped-Element Filters. 10.5 Miniature Filters Using High Dielectric-Constant Substrates. 10.6 Multilayer Filters. 11 Superconducting Filters. 11.1 High-Temperature Superconducting (HTS) Materials. 11.2 HTS Filters for Mobile Communications. 11.3 HTS Filters for Satellite Communications. 11.4 HTS Filters for Radio Astronomy and Radar. 11.5 High-Power HTS Filters. 11.6 Cryogenic Package. 12 Ultra-Wideband (UWB) Filters. 12.1 UWB Filters with Short-Circuited Stubs. 12.2 UWB-Coupled Resonator Filters. 12.3 Quasilumped Element UWB Filters. 12.4 UWB Filters Using Cascaded Miniature High- And Lowpass Filters. 12.5 UWB Filters with Notch Band(s). 13 Tunable and Reconfigurable Filters. 13.1 Tunable Combline Filters. 13.2 Tunable Open-Loop Filters without Via-Hole Grounding. 13.3 Reconfigurable Dual-Mode Bandpass Filters. 13.4 Wideband Filters with Reconfigurable Bandwidth. 13.5 Reconfigurable UWB Filters. 13.6 RF MEMS Reconfigurable Filters. 13.7 Piezoelectric Transducer Tunable Filters. 13.8 Ferroelectric Tunable Filters. Appendix: Useful Constants and Data. A.1 Physical Constants. A.2 Conductivity of Metals at 25 C (298K). A.3 Electical Resistivity rho in 10-8 m of Metals. A.4 Properties of Dielectric Substrates. Index.

4,774 citations


"Narrowband Substrate Integrated Wav..." refers background or methods in this paper

  • ...The upper stopband response is quite similar to that for a trisection filter in [9] although the working principle is different....

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  • ...For a BPF, midband insertion loss (IL) is inversely proportional to the FBW and the unloaded quality factor (QUL) of the resonators [9]....

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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


"Narrowband Substrate Integrated Wav..." refers background in this paper

  • ...THE substrate integrated waveguide (SIW) provides lower loss than conventional planar guides like microstrip and coplanar waveguide (CPW) and is of great interest for designing narrowband and highly selective bandpass filters (BPFs) [1]–[7]....

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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


"Narrowband Substrate Integrated Wav..." refers background or methods in this paper

  • ...The lower order TE101 mode offers one bypass coupling path that helps to create a TZ below the passband, but it does not contribute to desired passband [10]....

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  • ...The corresponding coupling matrix is [10]...

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  • ...In [10], filter using TE201 mode resonators provides improved selectivity but limited stopbands due to the lower order TE101 and next higher order TE301 mode....

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  • ...05 GHz does not contribute to passband but helps to create the TZs below the passband due to higher–lower order mode coupling [10]....

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  • ...stronger coupling with TE101 mode of the TE301 cavity compared to the weak coupling for offset feed of the TE201 resonator of [10]....

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Journal ArticleDOI
TL;DR: In this article, patent pending substrate integrated waveguide (SIW) bandpass filters with moderate fractional bandwidth and improved stopband performance are proposed and demonstrated for a Ka-band satellite ground terminal.
Abstract: In this paper, patent pending substrate integrated waveguide (SIW) bandpass filters with moderate fractional bandwidth and improved stopband performance are proposed and demonstrated for a Ka-band satellite ground terminal. Nonphysical cross-coupling provided by higher order modes in the oversized SIW cavities is used to generate the finite transmission zeros far away from the passband for improved stopband performance. Different input/output topologies of the filter are discussed for wide stopband applications. Design considerations including the design approach, filter configuration, and tolerance analysis are addressed. Two fourth-order filters with a passband of 19.2-21.2 GHz are fabricated on a single-layer Rogers RT/Duroid 6002 substrate using linear arrays of metallized via-holes by a standard printed circuit board process. Measured results of the two filters agree very well with simulated results, showing the in-band insertion loss is 0.9 dB or better, and the stopband attenuation in the frequency band of 29.5-30 GHz is better than 50 dB. Measurements over a temperature range of -20degC to +40degC show the passband remains almost unchanged.

148 citations


"Narrowband Substrate Integrated Wav..." refers background or methods in this paper

  • ...An SIW BPF with wide upper stopband is presented in [8]....

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  • ...As observed in [8], the filter using TE301 mode resonators provides wide stopband but selectivity is limited....

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Journal ArticleDOI
TL;DR: In this paper, a one-port reflection technique is developed to measure the unloaded and external Q of a microwave resonator and a sample chart is provided to further simplify the process.
Abstract: A one-port reflection technique is developed to measure the unloaded Q and external Q of a microwave resonator. The unique procedure of measuring unloaded Q is outlined in three easy steps. A sample chart is provided to further simplify the process. This method is so simple that even a scalar network analyzer is adequate for the measurement. In addition, a time-delay response around the resonator resonant frequency is also derived and presented. This theoretical result, combined with the advanced capability of modern vector network analyzers, has been proven to be very useful for characterization and tuning of the external Q of a resonator. All the results derived are verified by practical measurement. Finally, this technique is applied to the realization and tuning of a six-pole dielectric loaded cavity filter.

94 citations