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SYNTHESIS OF CHAINED-ELLIPTIC FUNCTION WAVEGUIDE BANDPASS FILTER WITH HIGH REJECTION
摘要： This paper describes the synthesis of a bandpass ?lter to achieve high selectivity and rejection properties using a new class of ?lter functions called chained-elliptic function ?lters. Chained-elliptic ?lters have higher selectivity than Chebyshev function ?lters and have the property of sensitivity to manufacturing tolerance reduction in chained-function ?lters. The proposed design has high selectivity and reduced sensitivity, enabling easier and faster ?lter fabrication. The characteristic polynomials of chained-elliptic function ?lters are derived (through chaining elliptic ?ltering function) and extracted to form a coupling matrix of the bandpass ?lter. The novel transfer polynomials are given in detail, and a thorough investigation of the ?lter characteristics is performed. A theoretical comparison with Chebyshev and elliptic ?lters of the same order is performed to ascertain the demonstrated advantages of this proposed ?lter class. A high frequency narrow-band fourth-order chained-elliptic function waveguide ?lter centred at 28 GHz with a fractional bandwidth of 1.61% is fabricated to validate the proposed design concept. A good match among the measured, simulated, and ideal ?lter responses is shown where the overall responses between measurement and simulation have a di?erence of approximately 2% which is within the acceptable limit. The chained-elliptic function concept will be useful in designing low-cost high-performance microwave ?lters with various fabrication technologies for millimetre-wave applications.
关键词： waveguide ?lter,5G,high rejection,bandpass ?lter,chained-elliptic function
更新于2025-09-23 15:19:57
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Design of Novel Compact Tri-Band Bandpass Filter Using Embedded Resonators
摘要： A novel compact tri-band bandpass ?lter is presented in this article. The proposed circuit utilizes a second-order embedded resonator. By controlling di?erent parts of the embedded resonator, the operating frequencies can be controlled individually. Furthermore, by introducing source-load coupling, transmission zeros are generated near the passband, resulting in high selectivity. To verify the proposed idea, a tri-band bandpass ?lter with operating frequencies of 2.4/3.5/5.15 GHz is implemented, which are used to cover the WiFi and WiMax system. The design procedures are discussed in detail, and the simulated and measured results are presented.
关键词： embedded resonator,Controllable frequencies,tri-band bandpass ?lter
更新于2025-09-19 17:15:36
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[IEEE 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019 - Boston, MA, USA (2019.6.2-2019.6.7)] 2019 IEEE MTT-S International Microwave Symposium (IMS) - Frequency-Tunable Substrate-Integrated Waveguide Filter using Contactless Rotatable Flaps
摘要： This paper introduces a substrate-integrated waveguide (SIW) ?lter that can be tuned using contactless rotatable ?aps. There is no mechanical contact between the tuning ?aps and the ?lter body, and this gives a number of advantages in frequency tuning since the ?aps do not experience any friction. In addition, it can be tuned with little power consumption, while maintaining stability. Periodic mushroom shaped pins are formed in the ?ap so that the ?eld generated in the resonator does not leak. Therefore, the Q-factor of the resonator does not decrease even though the ?aps are ?oating in the air. A third-order SIW ?lter was fabricated and measured for veri?cation. The center frequency is from 2.66 GHz to 3.34 GHz and the insertion loss varies from 0.79 dB to 0.88 dB.
关键词： recon?gurable ?lter,bandpass ?lter,tunable ?lter,SIW ?lter
更新于2025-09-12 10:27:22
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SUBSTRATE INTEGRATED WAVEGUIDE FILTER WITH IMPROVED STOPBAND PERFORMANCE USING LTCC TECHNOLOGY
摘要： A novel multi-layer third-order substrate integrated waveguide (SIW) bandpass ?lter with improved lower stopband performance is proposed. TE201-mode in folded-SIW cavity is utilized to implement negative cross coupling, and the TE101-mode is taken as a non-resonating node (NRN) for implementing bypass coupling. A circular aperture etched on the middle metal layer is used to realize coupling between source and the second SIW cavity. Then, three transmission zeros located below the passband can be obtained to improve stopband attenuation. Meanwhile, better spurious suppression performance above passband is achieved. A ?lter sample is designed and fabricated with multi-layer low-temperature co-?red ceramic (LTCC) technology. The measured S-parameters agree well with the simulated ones, with its predicted good performance.
关键词： transmission zeros,low-temperature co-?red ceramic (LTCC),Substrate integrated waveguide (SIW),bandpass ?lter,stopband performance
更新于2025-09-11 14:15:04
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TRIPLE-BAND COMPOSITE RIGHT/LEFT HANDED BANDPASS FILTER USING A NEW CIRCULAR INTER-DIGITAL CAPACITOR FOR WIRELESS APPLICATIONS
摘要： In this paper, a compact triple-band bandpass ?lter based on composite right/left handed (CRLH) approach has been proposed. The zeroth order resonance (ZOR) frequency of the designed ?lter can be controlled e?ectively by varying the series parameters. A new circular interdigital capacitor is integrated to provide series capacitance. The number of passbands depends on number of rings of circular interdigital capacitor (C-IDC). In order to validate metamaterial behavior, a dispersion diagram has been plotted for the designed ?lter. The proposed ?lter o?ers measured 3 dB fractional bandwidth of 71% at 1.7 GHz, 24% at 2.9 GHz and 12% at 4.1 GHz as center frequencies. The designed ?lter will be suitable for di?erent wireless applications such as global navigation satellite systems (1.559–1.610 GHz), GSM1800, indoor femtocells (2.5–2.7 GHz), air tra?c surveillance (2.7–2.9 GHz) and ?xed satellite services (3.8–4.2 GHz). The size of the proposed ?lter is 0.13λ0 × 0.11λ0, where λ0 is the free space wavelength at ZOR frequency of 1.7 GHz.
关键词： wireless applications,circular interdigital capacitor (C-IDC),composite right/left handed (CRLH),triple-band bandpass ?lter
更新于2025-09-10 09:29:36
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[IEEE 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI) - Bangalore, India (2018.9.19-2018.9.22)] 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI) - Compact Tunable Dual-band Bandpass Filter using Edge-open Split Ring Resonators for X-Band Applications
摘要： In this paper, a dual-band bandpass ?lter(BPF) is designed using edge-open Split Ring Resonators(SRR) which is obtained by modifying the conventional SRRs. The inner ring and the outer ring of the edge-open SRRs are connected to stubs to get dual passbands with improved ?lter characteristics. The rings of the SRR are loaded with varactor diodes to tune the individual passbands of the proposed BPF. The ?rst passband can be tuned independently by varying the capacitance of the varactor diode D1 while the second passband remains unchanged by ?xing the capacitance of the varactor diode D2 and vice versa. Hence, the proposed ?lter helps in tuning both the passbands independently of about 0.6GHz for the ?rst passband & 0.3GHz for the second passband and achieves compactness in size of about 20mm x 14mm. The ring equivalents of each rings and the obtained S-parameter results of the proposed BPF while tuning the individual passbands are discussed in this paper.
关键词： Split Ring Resonators,Varactor Diodes,Tunable ?lter,Metamaterials,Dual band bandpass ?lter
更新于2025-09-09 09:28:46
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A Wideband HTS Filter Using Strong Coupling Coplanar Spiral Resonator Structure
摘要： A novel coplanar spiral resonator structure (CSRS), which has a stronger coupling strength than normal CPW structure, is introduced. This structure helps to realize the remarkable strong coupling required for low-frequency wideband ?lters. Although no grounded stubs are deployed to balance the ground plane, the slot-line mode of the ?lter is not excited. An eight-pole wideband high-temperature superconducting (HTS) ?lter, with a fractional bandwidth (FBW) of 50% and a center frequency of 322MHz, is developed. The ?lter is designed and fabricated on a 0.5-mm-thick LaAlO3 substrate with a core size of 41mm × 22mm. The measured minimum insertion loss is 0.05dB and the ?rst spurious peak appears at 842 MHz, which is about 2.6 times the center frequency. The measured results agree well with the simulated results.
关键词： high-temperature superconducting (HTS),Wideband bandpass ?lter,coplanar waveguide (CPW)
更新于2025-09-09 09:28:46
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COMPACT TRI-BAND BANDPASS FILTER BASED ON HYBRID RESONATOR WITH IMPROVED SELECTIVITY PERFORMANCES
摘要： A novel microstrip tri-band bandpass ?lter is proposed and implemented using hybrid resonator with independently controllable center frequencies and good in-between isolation. This hybrid resonator is constructed by a stepped-impedance stub resonator and a single end shorted resonator. The stepped-impedance stub resonators are applied to achieve the ?rst and second passband, while the third passband is implemented by single end shorted resonators. By applying the even-odd mode approach, the resonance frequency ratio between even mode and odd mode inside the stepped-impedance stub resonators is attained. Furthermore, the ?lter with multi-path coupling structure can generate the transmission zeros at the edge of the passband, which can e?ectively improve the ?lter passband selectivity. Finally, a tri-band ?lter operating at 1.91, 2.73, and 3.45 GHz is designed and fabricated. The measurement results accord well with the full-wave electromagnetic designed responses.
关键词： single end shorted resonator,multi-path coupling structure,hybrid resonator,tri-band bandpass ?lter,stepped-impedance stub resonator
更新于2025-09-09 09:28:46
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Design of Dual-Band Bandpass Filter With Multiple Transmission Zeros Using Transversal Signal Interaction Concepts
摘要： In this letter, a compact dual-band bandpass ?lter (BPF) based on the transversal signal interaction concepts is presented. The center frequencies of dual-band BPF are centered at 3.8 and 4.8 GHz with 3-dB fraction bandwidths of 11.3% and 10.7%, respectively. Transversal ?ltering structure is introduced in the proposed dual-band BPF, which provides two signal propagation paths from input to output. Thus, a dozen of transmission zeros are yielded to obtain wide stopband suppression ranging from 5.2 to 16 GHz. To validate the design scheme, a dual-band BPF with high selectivity, compact size, independently controllable bandwidth, and wide stopband suppression is fabricated and measured.
关键词： Bandpass ?lter (BPF),transmission zeros,dual band,transversal signal interaction (TSI)
更新于2025-09-09 09:28:46
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A MINIATURIZED TUNABLE BANDPASS FILTER WITH CONSTANT FRACTIONAL BANDWIDTH
摘要： This paper presents a miniaturized tunable bandpass ?lter, consisting of two coaxial dielectric resonators and a pair of parallel-coupled lines. A coaxial dielectric resonators and a microstrip line form a new step-impedance resonator (SIR), which is di?erent from a conventional SIR. Varactor diodes are connected to SIRs to tune the center frequency. The gap between parallel-coupled lines controls the inter-stage coupling coe?cient. Lumped inductors used for coupling to I/O ports can reduce design complexity. The variations of coupling coe?cient and external quality factor with tuning frequency are analyzed using HFSS software. A appropriate coupling coe?cient which satis?es with constant fractional bandwidth within the tuning range is available. A tunable ?lter has been made of dielectric ceramics with dielectric constant of 38, fabricated on dielectric substrate and measured using Networks analyzer. Center frequencies vary from 0.43 GHz to 0.78 GHz, 3 dB fractional bandwidth from 6.4% to 6.8% when bias voltages are applied from 0 V to 10 V. The measured results validate the approach and agree with the simulation.
关键词： varactor diodes,constant fractional bandwidth,coaxial dielectric resonator,step-impedance resonator,tunable bandpass ?lter
更新于2025-09-04 15:30:14