A Wideband Microstrip Elliptic Bandpass Filter with Flexibly Tunable Bandwidth

Zhang, Fan; Li, Jin; Zhao, Peng; Huang, Guan‐Long; Xu, Jun

doi:10.1109/icmmt.2018.8563821

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…( 4)- (7). Form formula (8), the values of the capacitors C p1 , C p2 and C p3 can be determined by the center frequency and the series coupling capacitor.…”

Section: Fig 2 the Side View Of The Used Gaas Processing Technologymentioning

confidence: 99%

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A Miniaturized Bandwidth Reconfigurable Bandpass Chip Filter with Semi‐lumped Topology and GaAs pHEMT Technology

Linqing

Zhu

Xingyu

et al. 2021

Chinese J of Electronics

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A miniaturized reconfigurable bandpass chip filter with semi‐lumped topology and Gallium Arsenide pseudomorphic High electron mobility transistor (GaAs pHEMT) technology is proposed. Semi‐lumped topology is employed to instead the traditional lumped inductor with microstrip transmission line, which can reduced the size of the tunable filter significantly. Three‐order series and shunt resonated bandpass filter is implemented with shorted stubs and metal‐insulator‐metal capacitors. Two transmission zeros are introduced with the series resonator and the shunted GaAs FET. By tuning the gate bias circuit of the FET, the capacitance of the series resonator is changed and the bandwidth of the filter is adjusted correspondingly. An equivalent circuit model is developed to interpret the mechanism of the proposed filter circuit. A reconfigurable on chip filter sample operated at 10GHz is fabricated to validate the design. Two fractional bandwidth of 14.3% and 23.5% are tuned with bias voltage of the FET, while insertion loss of 2.4dB and 2.2dB are observed with the filter, respectively. The area of the chip filter is 0.86 × 0.96mm2 and is equivalent to an electrical length of 0.08 × 0.09λg2 at center frequency. Measurement results agree well with the simulation ones.

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“…( 4)- (7). Form formula (8), the values of the capacitors C p1 , C p2 and C p3 can be determined by the center frequency and the series coupling capacitor.…”

Section: Fig 2 the Side View Of The Used Gaas Processing Technologymentioning

confidence: 99%

“…[6,7]. A fourth order wideband microstrip elliptic bandpass filter is developed when less tuned elements are required to reconfigure the bandwidth of the filter [ 8 ] . The bandwidth of the stepped impedance resonate bandpass filter is adjusted with the vavator diodes [ 9 ] .…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Bandwidth Reconfigurable Bandpass Chip Filter with Semi‐lumped Topology and GaAs pHEMT Technology

Linqing

Zhu

Xingyu

et al. 2021

Chinese J of Electronics

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“…Therefore, most miniaturization techniques cannot be implemented using elliptic filtering functions. Elliptic filters are well-established, but unfortunately, the sensitivity of the filters to the manufacturing tolerance has not been addressed in recent studies [12][13][14][15][16][17][18]. In the upcoming years, the need for a filter with a low sensitivity to the manufacturing tolerance will grow drastically due to the rapid deployment of 5G communication.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Chained-Elliptic Function Waveguide Bandpass Filter With High Rejection

Ng¹,

Cheab²,

Wong³

et al. 2020

PIER C

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This paper describes the synthesis of a bandpass filter to achieve high selectivity and rejection properties using a new class of filter functions called chained-elliptic function filters. Chainedelliptic filters have higher selectivity than Chebyshev function filters and have the property of sensitivity to manufacturing tolerance reduction in chained-function filters. The proposed design has high selectivity and reduced sensitivity, enabling easier and faster filter fabrication. The characteristic polynomials of chained-elliptic function filters are derived (through chaining elliptic filtering function) and extracted to form a coupling matrix of the bandpass filter. The novel transfer polynomials are given in detail, and a thorough investigation of the filter characteristics is performed. A theoretical comparison with Chebyshev and elliptic filters of the same order is performed to ascertain the demonstrated advantages of this proposed filter class. A high frequency narrow-band fourth-order chained-elliptic function waveguide filter 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 filter responses is shown where the overall responses between measurement and simulation have a difference of approximately 2% which is within the acceptable limit. The chained-elliptic function concept will be useful in designing low-cost high-performance microwave filters with various fabrication technologies for millimetre-wave applications.

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“…As a result of increasing requirements of reconfigurable multiband communication systems, tunable planar bandpass filters (BPFs) have drawn a lot of attentions due to their potential of reducing the size, cost and complexity of RF font-ends [1,2,3,4,5,6,7,8,9,10,11,12]. There have been lots of research attempts to design tunable dual-band filters [13,14,15,16,17,18,19,20,21,22,23].…”

Section: Introductionmentioning

confidence: 99%

A compact tri-band microstrip filter with independently tunable passbands and high selectivity

Zhang

Gao

Wang

et al. 2019

IEICE Electron. Express

Self Cite

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This paper presents a compact tunable tri-band filter with independently controlled passbands and high selectivity. The filter is comprised of three pairs of varactor-loaded λ/4 short-circuited resonators. Each passband of the filter can be independently tuned by varying the voltage applied to the corresponding resonators. In addition, a source-load coupling structure is employed to produce transmission zeros (TZs) achieving high selectivity. A prototype tunable tri-band microstrip filter is implemented. The experiment results show that the three passbands have tuning ranges of 0.81-0.99 GHz, 1.34-1.54 GHz, and 1.8-2.03 GHz, respectively.

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A Wideband Microstrip Elliptic Bandpass Filter with Flexibly Tunable Bandwidth

Cited by 4 publications

References 12 publications

A Miniaturized Bandwidth Reconfigurable Bandpass Chip Filter with Semi‐lumped Topology and GaAs pHEMT Technology

A Miniaturized Bandwidth Reconfigurable Bandpass Chip Filter with Semi‐lumped Topology and GaAs pHEMT Technology

Synthesis of Chained-Elliptic Function Waveguide Bandpass Filter With High Rejection

A compact tri-band microstrip filter with independently tunable passbands and high selectivity

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