Single-/Multi-Band Bandpass Filters and Duplexers With Fully Reconfigurable Transfer-Function Characteristics

Simpson, Dakotah; Gómez‐García, Roberto; Psychogiou, Dimitra

doi:10.1109/tmtt.2019.2899849

Cited by 43 publications

(32 citation statements)

References 32 publications

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“…Recently, there has been a great interest in balanced bandpass filters (BPFs) on account of high immunity to crosstalk and electromagnetic interference [1,2,3,4,5,6,7,8,9,10,11,12]. Considering the tunability and reconfigurability of RF/microwave system [13,14,15], the microstrip line resonator has been extensively utilized to design tunable balanced BPFs due to its simple manufacture process and easy integration with active devices. Accordingly, great efforts have been paid on tunable microstrip balanced BPFs [16,17,18,19,20,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

Tunable balanced BPF with wide tuning range and high selectivity

Wang

Zhang

Liu

et al. 2020

IEICE Electron. Express

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A highly-selective tunable balanced bandpass filter (BPF) with wide tuning range of center frequency is presented. The balanced BPF is designed by using compact varactor-tuned parallel coupled-line resonators with the direct-feed structure. It can realize a wide tuning range with an almost constant fractional bandwidth (CFBW). Three differential-mode (DM) transmission zeros (TZs) close to the tunable passband are obtained by mixed electromagnetic coupling and frequency-variant source-load (S-L) coupling. Meanwhile, the three TZs can almost keep the same relative location of passband to achieve continuous high selectivity and good out-of-band rejection over the whole frequency-tuning range. For verification, a tunable 1.02-3.25 GHz balanced BPF with three selfadaptive TZs is designed, fabricated and measured. And experimental and simulated results are in good agreement.

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Section: Introductionmentioning

confidence: 99%

Tunable balanced BPF with wide tuning range and high selectivity

Wang

Zhang

Liu

et al. 2020

IEICE Electron. Express

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“…Due to the development of wireless communication technique, great efforts have been paid on tunable and multi-purpose RF/microwave systems. [1][2][3][4][5] As one of the key devices, tunable bandpass filters (BPFs) are becoming research hotpots because of great potential for reducing the system size and complexity. [6][7][8][9][10] The frequency tuning range is the key performance of tunable BPFs.…”

Section: Introductionmentioning

confidence: 99%

A tunable 0.86‐3.83 GHz bandpass filter with high selectivity

Wang

Zhang

Liu

et al. 2020

Int J RF Microw Comput Aided Eng

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This letter presents a tunable bandpass filter (BPF) with wide tuning range of center frequency and high selectivity. The wide frequency tuning range is achieved by two pairs of switchable varactors‐tuned parallel coupled line resonators with direct‐feed structure, which can be switched to lower and higher frequency resonator modes by using p‐i‐n diodes. Since the electromagnetic mixed coupling and frequency‐variant source‐load coupling are incorporated in this configuration, three self‐adaptive transmission zeros (TZs) close to the tunable passband are obtained. Also, three TZs can almost keep the same relative location of passband to achieve continuous high selectivity and good out‐of‐band rejection over the whole frequency tuning range. Meanwhile, by selecting a proper coupling region, a constant fractional bandwidth (CFBW) in the frequency tuning process can be realized. For verification, a tunable 0.86‐3.83 GHz BPF with a 12% CFBW and high selectivity is designed, fabricated and measured. The experimental results show the proposed filter has the advantages of wide tuning range and high selectivity.

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“…In order to facilitate their deployment, multi-band bandpass filters (BPFs) with a highly selective response, low insertion loss (IL) and small physical size need to be incorporated in the RF front-ends of these systems in order to be able to acquire the bands of interest while suppressing the unwanted interfering signals. Therefore, the realization of filters with multi-band transfer functions has been an important topic of research [1][2][3][4][5][6][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Microstrip-based designs have been investigated in [3][4][5][6][7][8][9][10][11][12][13][14][15] as reduced-size alternatives. While they exhibit moderate IL levels (<2.5 dB in [3][4][5]), they suffer from closely spaced spurious responses.…”

Section: Introductionmentioning

confidence: 99%

“…Extracted pole filters have also been explored in [7,8] for transmission zero (TZ) generation, however, they exhibit high IL levels (>3 dB). In order to further decrease the physical size of dual-band BPFs, hybrid microstrip and LE architectures have been presented in [9][10][11][12][13][14][15]. However, they exhibited moderate out-of-band rejection of about 20-30 dB [9][10][11][12] and spurious resonances appeared at a distance of 1.5 f 0 [13].…”

Section: Introductionmentioning

confidence: 99%

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Quasi-elliptic dual-band bandpass filters based on series-cascaded multi-resonant cells

Ashley

Simpson

Psychogiou

2020

Int. J. Microw. Wireless Technol.

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This paper reports on quasi-elliptic dual-band bandpass filters (BPFs) that were designed for the Filter Student Design Competition of the 2019 European Microwave Week. The proposed lumped-element (LE) BPF concept is based on two dual-band transversal cells and one multi-resonant cell that allow the realization of symmetric and asymmetric dual-band transfer functions shaped by six poles and five transmission zeros. A compact implementation scheme based on LE series resonators is proposed for size compactness and wide spurious free out-of-band response. For proof-of-concept demonstration purposes, a dual-band LE prototype with two passbands centered 1 and 1.5 GHz was designed, manufactured, and measured. It exhibited the following radio frequency measured performance characteristics. Passbands centered at 1.02 and 1.45 GHz, minimum insertion loss levels of 2.0 and 2.7 dB, and bandwidth of 146 and 105 MHz, respectively, for the first and the second passband, and out-of-band rejection >30 dB between 0 and 894 MHz, 1.17–1.34 GHz, and 1.72–6.9 GHz.

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Single-/Multi-Band Bandpass Filters and Duplexers With Fully Reconfigurable Transfer-Function Characteristics

Cited by 43 publications

References 32 publications

Tunable balanced BPF with wide tuning range and high selectivity

Tunable balanced BPF with wide tuning range and high selectivity

A tunable 0.86‐3.83 GHz bandpass filter with high selectivity

Quasi-elliptic dual-band bandpass filters based on series-cascaded multi-resonant cells

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