Novel substrate integrated folded waveguide filter

This letter presents a new filter, based on substrate integrated folded waveguide (SIFW) technology, which exhibits compact size and good out-of-band rejection. The filter is based on a SIFW cavity, which guarantees size reduction, and the out-of-band rejection is controlled by the suppression and tuning of the highorder cavity modes. A detailed investigation of the cavity mode spectrum is presented, to illustrate the operation principle and the design of the filter. The interesting feature of this filter is the possibility to design the pass band and the return band by simply tuning the mode spectrum of the cavity, which is practically unaffected by the connection to the excitation ports. The fabrication and testing of a prototype operating at 4.5 GHz validate the proposed filter topology.Index Terms-Cavity resonators, filters, substrate integrated waveguide (SIW).

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“…Several components in SIFW have been implemented, including some interesting SIFW filter topologies [6], [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

Substrate Integrated Folded Waveguide Filter with Out-of-Band Rejection Controlled by Resonant-Mode Suppression

Moro

Moscato

Bozzi

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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“…The improved structure has only half the width of its equivalent SIW structure, but retains the similar cutoff and propagation characteristics [10]. Thus, folded SIW cavity is a good choice for the miniaturized filter designs [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Design of a Miniaturized Dual-Band Double-Folded Substrate Integrated Waveguide Bandpass Filter With Controllable Bandwidths

Zhang¹,

Wang²,

Wang³

et al. 2013

PIER

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Abstract-One miniaturized multilayer dual-band bandpass filter (BPF) is developed using standard low temperature co-fired ceramic (LTCC) technology. The filter makes use of four double-folded substrate integrated waveguide (SIW) resonators. Two sets of coupling paths between the source and load are implemented to generate dualband responses. Utilizing this method, the two passbands can operate at independent frequencies and the bandwidth can be easily controlled. High isolation is obtained between two passbands, and two pairs of transmission zeros close to the passband edges are generated by sourceload coupling, resulting in high skirt-selectivity. Good agreement between the simulated and measured results of the filter sample is obtained, with its high electrical performance validated.

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“…SIFWs exhibit similar cutoff frequency and propagation characteristics while occupy only half the area of its SIWG equivalent structure. Compact SIFW resonant cavities of two different types have been proposed and compared in [7], quarter-wavelength SIFW cavity has been used for a filter design in [8], and another miniaturization technique for SIFW resonators has been developed in [9] and investigated in [10].…”

Section: Introductionmentioning

confidence: 99%

Folded substrate integrated waveguide cross‐coupled filters with negative coupling structure for wireless systems

Glubokov

Nagandiram

Tarczyński

et al. 2011

Micro & Optical Tech Letters

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Numerical study of a new type of tunable SRR metamaterial structure, J Electromagn Waves Appl 22 (2008), 1819-1828. 6. M.F. Khan and M.J. Mughal, Effective permeability of inner ring shorted split ring resonator, Microwave Opt Technol Lett 50 (2008), 624-627. 7. Z. Sheng and V.V. Varadan, Tuning the effective properties of metamaterials by changing the substrate properties, J Appl Phys 101 (2007), 041909. 8. I. Gil, J. Bonache, J. Garcia-Garcia, and F. Martin, Tunable metamaterial transmission lines based on varactor-loaded split-ring resonators, IEEE Trans Microwave Theory Tech 54 (2006), 2665-2674. 9. I.V. Shadrivov, S.K. Morrison and Y.S. Kivshar, Tunable split ring resonators for nonlinear negative index metamaterials, Opt Express 14 (2006), 9344-9349. 10. M.F. Khan, M.J. Mughal and M. Bilal, Effect of rotation of bottom metallic strips shorted S-shaped resonator on its working frequen-ABSTRACT: In this article, a compact multilayer substrate integrated filter with pseudoelliptic power transfer function is presented. The fourth-order bandpass filter designed by optimization has a central frequency of 10 GHz with a bandwidth of 800 MHz. It possesses two transmission zeros and exhibits return loss of À30 dB. Miniaturization is achieved using folded waveguide technology. Novel negative coupling structure based on upside-down-folded iris-coupled resonators is introduced and investigated. Design procedure is briefly explained, coupling matrix is derived, and investigation of coupling elements is carried out to match calculated coupling coefficients. Results of fullwave simulation of the filter are in good agreement with the prototype.ABSTRACT: We propose and investigate a phase-shifted long-period fiber grating (LPFG) written by CO 2 laser in twisted single-mode fibers (SMFs). For the beating effect, two peaks of LPFG derived from phase-shift further split into two peaks, respectively. The evolution and characterization of the transmission spectra were investigated. The channel spacing of the phase-shifted LPFGs written in twisted Er-doped fiber could be much narrower than that of which written in twisted normal SMF. Polarization dependent loss of the phase-shifted beat-gratings is less than 0.6 dB. This type of gratings provides potential applications in optical communication systems, such as course wavelength division multiplexing devices.

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Novel substrate integrated folded waveguide filter

Cited by 23 publications

References 10 publications

Substrate Integrated Folded Waveguide Filter with Out-of-Band Rejection Controlled by Resonant-Mode Suppression

Substrate Integrated Folded Waveguide Filter with Out-of-Band Rejection Controlled by Resonant-Mode Suppression

Design of a Miniaturized Dual-Band Double-Folded Substrate Integrated Waveguide Bandpass Filter With Controllable Bandwidths

Folded substrate integrated waveguide cross‐coupled filters with negative coupling structure for wireless systems

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