Design of a Compact Ultra-Wideband Bandpass Filter Using Inductively Compensated Parallel-Coupled Lines

Jamsai, Meechai; Angkawisittpan, Niwat; Nuan-On, Adisorn

doi:10.3390/electronics10212575

Cited by 15 publications

(12 citation statements)

References 23 publications

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“…Referring to Fig. 2, shown a 10.7-MHz fully balanced current-tunable bandpass filter with Caprio technique, and have also conducted simulations to validate the circuit's performance using the PSpice software [29][30][31]. A 10-7 MHz fully balanced current-tunable bandpass filter with Caprio technique, as illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, [13] offers improved selectivity and tuning range but may entail greater complexity and cost. Further advances in filter technology and diverse design options for various applications are presented in [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. While [15][16][17][18][19] emphasize enhanced selectivity and bandwidth, they may exhibit sensitivity to temperature and fabrication variations.…”

Section: Introductionmentioning

confidence: 99%

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The development of a 10.7-MHz fully balanced current-tunable bandpass filter with Caprio technique

Lertkonsarn,

Khwunnak,

Angkawisittpan

et al. 2023

Eureka: PE

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Bandpass filters are integral in modern communication systems for selecting specific frequency ranges to ensure interference-free signal transmission and reception. This paper explores various bandpass filter designs, including those using active inductors, transmission-line unit-cells, microstrip open-loop resonators, and dual-port dual-frequency integration antennas. The focus is on the 10.7-MHz bandpass filter, widely used in FM radio and television systems. The study evaluates current-controlled and balanced designs, analyzing their performance, advantages, and drawbacks. Unique trade-offs in terms of linearity, distortion, temperature sensitivity, and component variations are discussed. Additionally, advancements in filter technology and diverse design options are presented. The paper introduces a novel current-balanced, frequency-adjusted bandpass filter to address odd-order noise issues. This filter aims to achieve high linearity, harmonic distortion attenuation, and the elimination of even-order harmonics. Through synthesis, analysis, simulation, and comparison with traditional filters, the proposed design enhances signal quality and efficiency. The fully-balanced current-tunable bandpass filter with the Caprio technique at 10.7 MHz is developed, exhibiting symmetrical characteristics with lower total harmonic distortion. The circuit’s structure is simple and adaptable for integration, validated through consistent simulation results. The study concludes by emphasizing the constant sensitivity of transistor differential amplifier circuits to the center frequency and the linear relationship between center frequency and adjustable bias current. The suggested transistor and capacitor selection criteria contribute to optimizing the circuit’s performance, aligning with the Caprio technique’s recommendations. Overall, this research presents a promising solution for achieving high-quality signal transmission in contemporary communication systems

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The development of a 10.7-MHz fully balanced current-tunable bandpass filter with Caprio technique

Lertkonsarn,

Khwunnak,

Angkawisittpan

et al. 2023

Eureka: PE

Self Cite

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show abstract

“…However, this design compromises bandwidth and electrical performance. The development of an ultra-wideband bandpass filter (UWB-BPF) using the conventional method is presented in [9], where inductively compensated parallel coupled lines (ICPCL) are employed. The resulting filter is compact in size but experiences a compromise in electrical performance.…”

Section: Introductionmentioning

confidence: 99%

A Novel Synthesis of Quasi-Chebyshev Ultra-Wideband Bandpass Filter Using Nth Order Stub Loaded Coupled-Line Resonator

Abdul Rehman,

Khalid,

Mushtaq

et al. 2023

Micromachines

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This paper presents a novel synthesis of a quasi-Chebyshev Nth order stub-loaded coupled-line ultra-wideband bandpass filter. A unit element of a proposed filter topology consists of two short-circuited stubs loaded at the edges of coupled lines. A distributed equivalent circuit model of a proposed topology is extracted and used to acquire a generalized filtering function. The extracted filtering function is of rational form. The denominator of the filtering function causes a mismatch with Chebyshev type-I polynomials. For conventional narrowband filters, the denominator term can be neglected because of the close vicinity of band-edge frequencies; however, for the ultra-wideband filter response, the factor in the denominator cannot be neglected and hence requires a new mathematical procedure to compensate for the effect of the frequency-dependent term in the denominator. The electrical parameters are calculated using the proposed synthesis and used to design an ideal filter topology on ADS. To validate the proposed design procedure, fabrication is performed on a high-frequency substrate. The proposed filter is miniaturized in size and has good out-of-band performance. The simulated and measured results provide good agreement.

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“…Wide pass-band filters are becoming increasingly recommended due to their compatibility with integration into various circuits and antennas, which helps to enhance the performance of radio systems [1][2][3]. Over the past few decades, microwave researchers have adopted a few approaches for designing wideband filters [4][5][6][7][8][9][10][11][12][13][14]. Funnel-type ASIRs and DGSs (defected ground structures) were used to design wideband bandpass filters (BPFs) with upper wide stopband responses [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Implementation of a Wideband Microwave Filter Design with Dual Electromagnetic Interference (EMI) Mitigation for Modern Wireless Communication Systems with Low Insertion Loss and High Selectivity

Basit,

Daraz,

Zhang

2023

Micromachines

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By leveraging the advantages of the uniform transmission line, this manuscript presents a broadband high-selectivity filter range starting from 2.5 GHz to 16.8 GHz, utilizing a simple uniform transmission line structure loaded with three-quarter-wavelength stubs. The proposed UWB filter is studied using the ABCD network parameter method. After that, a shorted T-shaped stub-loaded resonator is coupled with the transmission line of the UWB filter to obtain dual-notch features at 4.4 GHz (for long distance wireless ISPs (WISPs), 4G/5G operator for LTE backhaul) and 7.5 GHz (for X-band downlink communication). The overall footprint is specified as 22.5 mm × 12 mm or 1.12 λg × 0.6 λg, where λg represents the wavelength at the central frequency. The operating principle of such a filter is explained, and its controllable broadband response, as well as controllable stopband frequencies, are optimized to show some of the attractive features of the new scheme, such as a super wideband response of about a 148.18% fractional bandwidth; an out-of-band performance up to 25 GHz; five single-resonator transmission poles filtering behaviour at different frequencies, with highly reduced radiation losses greater than 10 dB; a simple topology; a flat group delay; a low insertion loss of 0.4 dB; and high selectivity. Additionally, the filter is fabricated and evaluated, and the results show a good match for experimental validation purposes.

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Design of a Compact Ultra-Wideband Bandpass Filter Using Inductively Compensated Parallel-Coupled Lines

Cited by 15 publications

References 23 publications

The development of a 10.7-MHz fully balanced current-tunable bandpass filter with Caprio technique

The development of a 10.7-MHz fully balanced current-tunable bandpass filter with Caprio technique

A Novel Synthesis of Quasi-Chebyshev Ultra-Wideband Bandpass Filter Using Nth Order Stub Loaded Coupled-Line Resonator

Implementation of a Wideband Microwave Filter Design with Dual Electromagnetic Interference (EMI) Mitigation for Modern Wireless Communication Systems with Low Insertion Loss and High Selectivity

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