High-Order Dual-Band Superconducting Bandpass Filter With Controllable Bandwidths and Multitransmission Zeros

Liu, Haiwen; Ren, Baoping; Hu, Shuangxi; Guan, Xuehui; Wen, Pin; Tang, Jiaming

doi:10.1109/tmtt.2017.2690295

Cited by 57 publications

(42 citation statements)

References 24 publications

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“…The rapid development of wireless communications technologies has placed increasing demands on multi‐functional radio frequency (RF) systems. As one of the key components of wireless systems, multi‐band/dual‐band filters have been widely studied in recent years . Several methods have been adopted to design dual‐band filters .…”

Section: Introductionmentioning

confidence: 99%

“…Filters designed with this method usually have compact sizes. However, it is difficult to adjust the internal and external couplings to meet the requirements of both passbands simultaneously . Many multi‐/dual‐band filters are limited to low pole numbers.…”

Section: Introductionmentioning

confidence: 99%

“…As one of the key components of wireless systems, multi-band/dual-band filters have been widely studied in recent years. [1][2][3][4][5][6][7][8][9][10][11][12] Several methods have been adopted to design dual-band filters. [1][2][3][4][5][6][7][8][9][10][11][12] A simple and direct approach is to combine 2 single-band filters in parallel.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is difficult to adjust the internal and external couplings to meet the requirements of both passbands simultaneously. 7 Many multi-/dual-band filters are limited to low pole numbers. 5,[8][9][10]13,14 Moreover, the first spurious passband of dualband filter may locate close to the upper passband, resulting in unsatisfied stopband response.…”

Section: Introductionmentioning

confidence: 99%

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High-order dual-band superconducting filter with independently controllable passbands and wide stopband

Guo

Luo

et al. 2018

Int J RF Microw Comput Aided Eng

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A stepped‐impedance‐stub loaded stepped‐impedance resonator (SISLSIR) is proposed to design a dual‐band bandpass filter. The even‐ and odd‐mode frequencies and the coupling strength of the proposed resonators can be independently designed and adjusted. A dual‐feedline structure is used to meet the required external couplings of the 2 passbands. Thus, both the center frequencies and the bandwidths of the 2 passbands can be independently controlled. A 6‐pole dual‐band filter with the passbands of 3300∼3600 MHz and 4800∼5000 MHz is successfully designed using the proposed method and fabricated with YBCO/MgO high‐temperature superconducting (HTS) wafer. The measured results of the filter exhibit high performance and match well with the simulations. The measured insertion losses are less than 0.2/0.3 dB, and the return losses are greater than 15/14 dB for the lower/upper passbands, respectively. The out‐of‐band rejection is greater than 68 dB up to 12 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-order dual-band superconducting filter with independently controllable passbands and wide stopband

Guo

Luo

et al. 2018

Int J RF Microw Comput Aided Eng

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“…Unlike single-band differential microstrip BPFs, fewer numbers of balanced filter designs and techniques have been proposed recently with a dual-band performance [58][59][60][61][62][63][64][65][66][67][68][69][70]. Nevertheless, increasing demand for flexible resonant devices has led to more attention and interest in designing and implementing of dual-/tri-/quad-band BPFs.…”

Section: Dual-band Differential Microstrip Bpfsmentioning

confidence: 99%

A Survey of Differential-Fed Microstrip Bandpass Filters: Recent Techniques and Challenges

Al‐Yasir

Parchin

Abdulkhaleq

et al. 2020

Sensors

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Differentially driven devices represent a highly promising research field for radio frequency (RF), microwave (MW), and millimeter-wave (mmWave) designers and engineers. Designs employing differential signals are essential elements in low-noise fourth-generation (4G) and fifth-generation (5G) communications. Apart from the conventional planar MW components, differential-fed balanced microstrip filters, as promising alternatives, have several advantages, including high common-mode rejection, low unwanted radiation levels, high noise immunity, and wideband harmonic suppression. In this paper, a comprehensive and in-depth review of the existing research on differential-fed microstrip filter designs are presented and discussed with a focus on recent advances in this research and the challenges facing the researchers. A comparison between different design techniques is presented and discussed in detail to provide the researchers with the advantages and disadvantages of each technique that could be of interest to a specific application. Challenges and future developments of balanced microstrip bandpass filters (BPFs) are also presented in this paper. Balanced filters surveyed include recent single-, dual-, tri-, and wide-band BPFs, which employ different design techniques and accomplish different performances for current and future wireless applications.3 of 25 between these designs follow each section. Section 6 shows the challenges and future development of differential-fed microstrip BPFs. Finally, Section 7 presents the conclusion of our review. Single-Band Differential Microstrip BPFsRecently, many single-band differential planar BPFs based on different techniques have been reported [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. The main difference between these designs is the structures utilized. Several types of resonators and techniques can be used to obtain a single-band differential planar BPF with different performance. Generally, the common-mode noise suppression is an interesting topic for high-speed and high-frequency wireless applications. The common-mode noise signals can degrade the differential-mode transmitted signals as well as the entire power of such wireless applications. To suppress the common-mode signals, some researchers and engineers have proposed the use of a series of combinations of single-band differential-fed planar filters and transmission lines [39]. However, this technique will lead to a large area and so not suitable for new demands of compact systems. However, Ebrahimi et al. have proposed a new balanced BPF using dumbbell-shaped defected ground structures (DGSs) [42]. The proposed DGS resonator provides the option of implementing higher-order differential filters. Also, in comparison with similar techniques such as S-shaped complementary split-ring resonators (CSRRs), which have similar structures in common-mode and differential mode transmission [39], differential filters based on DGSs provide high common-mode attenuation by utilizing two separate equiv...

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A dual‐band superconducting filter with a large bandwidth ratio

Guo

et al. 2019

Int J RF Microw Comput Aided Eng

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In this study, we propose a stepped-impedance-stub loaded interdigital capacitor resonator for design of a dual-band band-pass filter with a large bandwidth ratio.The presented resonator has strong and weak couplings in the upper passbands (UPs) and lower passbands (LPs), respectively, so as to form a large upper/lower bandwidth ratio. Adopting a dual-branch phase-matched feedline structure can meet the external quality factors required for the UP/LP. Therefore, these two passbands, defined by their respective center frequencies and bandwidths, can be manipulated independently. A four-pole dual-band example filter with a lower bandwidth of 20 MHz at 1576 MHz and an upper bandwidth of 200 MHz at 2450 MHz is successfully designed on an YBCO/MgO superconducting wafer. The filter exhibits excellent frequency responses. The upper/LPs show insertion losses below 0.07/0.22 dB and return losses above 15.3/15.3 dB. The stopband rejection is better than 57 dB until the first spurious passband up to 6150 MHz (3.9f L ). K E Y W O R D Sdual band, filter, high-temperature superconductor, interdigital capacitor resonator, steppedimpedance resonator

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High-Order Dual-Band Superconducting Bandpass Filter With Controllable Bandwidths and Multitransmission Zeros

Cited by 57 publications

References 24 publications

High-order dual-band superconducting filter with independently controllable passbands and wide stopband

High-order dual-band superconducting filter with independently controllable passbands and wide stopband

A Survey of Differential-Fed Microstrip Bandpass Filters: Recent Techniques and Challenges

A dual‐band superconducting filter with a large bandwidth ratio

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