Compact Tunable Balanced Bandpass Filter With Constant Bandwidth Based on Magnetically Coupled Resonators

Deng, Hong‐Wei; Sun, Lingling; Liu, Fei; Xue, Yifan; Xu, Tao

doi:10.1109/lmwc.2019.2902328

Cited by 30 publications

(32 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, 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.…”

Section: Single-band Differential Microstrip Bpfsmentioning

confidence: 99%

“…Therefore, and to achieve the requirements of high-performance tunable/reconfigurable RF devices, it is highly recommended to develop and investigate the design of tunable BPFs with differential-fed ports to improve the integration properties [ High immunity to noise and crosstalk signals, which can be offered by the differential-fed structures, makes balanced components are widely used in many wireless communications. Therefore, and to achieve the requirements of high-performance tunable/reconfigurable RF devices, it is highly recommended to develop and investigate the design of tunable BPFs with differential-fed ports to improve the integration properties [35,[51][52][53]. During the past few years, fluidics-based resonating technologies have been widely applied in tunable filter circuits [35,[54][55][56].…”

Section: Of 25mentioning

confidence: 99%

See 1 more Smart Citation

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

Al‐Yasir

Parchin

Abdulkhaleq

et al. 2020

Sensors

View full text Add to dashboard Cite

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...

show abstract

Section: Single-band Differential Microstrip Bpfsmentioning

confidence: 99%

Section: Of 25mentioning

confidence: 99%

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

Al‐Yasir

Parchin

Abdulkhaleq

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…Tunable filters have attracted many attentions for reconfigurable system in recently years . Except the center frequency, bandwidth tunable, and both center frequency and bandwidth tunable filters, the transmission zero (TZ)‐tunable filter was studied as well . The TZ‐tunable filter can adaptively notch the stopband interferers or vary the skirt selectivity, which is helpful for the communication or radar system to adapt to the time‐varying RF signal .…”

Section: Introductionmentioning

confidence: 99%

A microstrip bandpass filter with 2 independently tunable transmission zeros

Cheng

2020

Micro & Optical Tech Letters

View full text Add to dashboard Cite

This letter presents a new design method for a tunable bandpass filter with independently and widely tunable transmission zeros (TZs). Varactor‐loaded microstrip resonators are introduced to a fixed bandpass filter to realize the continuously tunable TZs. Although the tunable resonators have unloaded Q lower than 100, the insertion loss of the filter is not increased. The coupling matrix with the lossy resonators is synthesized and used to analyze the characteristic of the TZ‐tunable filter. A bandpass filter centered at 2 GHz with a 3‐dB bandwidth of 230 MHz is designed to validate the design concept. The measured results show good agreement with the simulated results. The fabricated filter has 2 TZs ranging from 1.4 to 1.8 GHz and from 2.28 to 3.08 GHz, respectively. The TZ‐tunable filter exhibits insertion losses ranging from 1.62 dB to 1.93 dB at the center frequency. The center frequency and bandwidth keep nearly unchanged when the TZs are tuned.

show abstract

“…Due to the high immunity to the environmental and common-mode (CM) noise, the balanced frequency-agile bandpass filters (BAL-FA-BPFs) have drawn many attentions and have been well investigated in recent years. [4][5][6][7][8][9][10][11][12] The majority of research for useful CABW filters are the two-pole BAL-FA-BPFs, [10][11][12] because of their simpler coupling scheme, wide FTR, stable CABW, and single-DC-bias control. However, to obtain higher passband selectivity and stopband suppression, the high-order BAL-FA-BPFs are more preferable in practical application.…”

Section: Introductionmentioning

confidence: 99%

Three‐pole wide‐tuning‐range balanced frequency‐agile bandpass filter with constant absolute bandwidth and 3 transmission zeros

Tang

Yang

et al. 2020

Micro & Optical Tech Letters

View full text Add to dashboard Cite

This paper proposes a 3-pole wide-tuning-range, balanced frequency-agile bandpass filter (BAL-FA-BPF) with constant absolute bandwidth (CABW) and 3 transmission zeros (TZs). Under the differential-mode (DM) operation, the cascaded trisection coupling topology with source-load coupling is constructed. Thus, 3 adaptive TZs are generated for the DM responses, which improves the passband selectivity and stopband suppression. Under the common-mode (CM) operation, the short stubs and lumped elements are added at the symmetric plane which effectively improves the CM suppression. Using the advanced matrix synthesis, a demonstrative BAL-FA-BPF is designed with stable CABW and controlled by single-DC-bias. The measured frequency tuning range of the DM passband is 2.0 to 3.0 GHz (40%) and 3 dB-bandwidth is kept at 174 AE 3 MHz (AE1.7%). The CM suppression is better than 25 dB. K E Y W O R D S balanced frequency-agile bandpass filter, constant absolute bandwidth, element variable coupling matrix, single-DC-bias control, 3 transmission zeros, tunable three-pole resonator-coupled filter

show abstract

Compact Tunable Balanced Bandpass Filter With Constant Bandwidth Based on Magnetically Coupled Resonators

Cited by 30 publications

References 8 publications

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

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

A microstrip bandpass filter with 2 independently tunable transmission zeros

Three‐pole wide‐tuning‐range balanced frequency‐agile bandpass filter with constant absolute bandwidth and 3 transmission zeros

Contact Info

Product

Resources

About