Tunable balanced bandpass filter with constant absolute bandwidth and high common mode suppression

Song, Kaijun; Wang, Xi; Fan, Maoyu; Chen, Yuxuan; Patience, Shema Richard; Iman, Abdelqani Mohamed; Yang, Fan

doi:10.1049/iet-map.2019.0389

Cited by 10 publications

(12 citation statements)

References 30 publications

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“…Balanced components, including bandpass filters, have received much attention due to their immunity to noise and cross talk 18‐20 . A highly‐selective and tunable balanced bandpass filter is reported in 21 .…”

Section: Introductionmentioning

confidence: 99%

Highly‐tunable and wide stopband microstrip bandpass filters

Iqbal

Smida

Waly

et al. 2021

Int J RF Microw Comput Aided Eng

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This paper presents the design of a highly‐tunable single‐ended and balanced filter with improved upper stopband performance. The proposed filters are designed using a spurline and a U‐shaped stepped impedance resonator (SIR) with a varactor diode connected to the open‐circuited end. A spurline is introduced in both designs to achieve wide stopband performance by suppressing the higher‐order modes. The proposed filters have high tunable ranges (single‐ended: 2.35‐3.99 GHz; balanced: 2.39‐4 GHz), low insertion losses (IL) (single‐ended: 0.07‐0.2 dB; balanced: 0.21 to 1.1 dB) and wide upper stopband performance (single‐ended: 3.79f1 with a rejection level higher than 20 dB; balanced: 3.79f1 with a rejection level higher than 20 dB). Performance of both filters are experimentally validated by comparing the experimental results with the simulated ones. Both filters can cover most of the fifth‐generation (5G) wireless communication bands with different biasing voltages (capacitance). When both filters are compared with state‐of‐the‐art filters, the proposed filters are found to achieve high tunable ranges with low IL and wide upper stopband performance.

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Section: Introductionmentioning

confidence: 99%

Highly‐tunable and wide stopband microstrip bandpass filters

Iqbal

Smida

Waly

et al. 2021

Int J RF Microw Comput Aided Eng

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“…Balanced front-ends with the ability to adapt to different communication bands and suppress a variety of interfering signals have been of importance in multi-standard RF transceivers. As a key component in such systems, tunable balanced bandpass filters (BPFs) that efficiently transmit the signals in the differential mode and effectively suppress signals in the common mode have been a focus of recent research efforts [2][3][4][5][6][7][8][9][10][11][12][13]. Although a number of tunable concepts have been presented in the open technical literature [2][3][4][5][6][7][8][9], the majority of them focus on center frequency tuning only.…”

Section: Introductionmentioning

confidence: 99%

“…As a key component in such systems, tunable balanced bandpass filters (BPFs) that efficiently transmit the signals in the differential mode and effectively suppress signals in the common mode have been a focus of recent research efforts [2][3][4][5][6][7][8][9][10][11][12][13]. Although a number of tunable concepts have been presented in the open technical literature [2][3][4][5][6][7][8][9], the majority of them focus on center frequency tuning only. For example, a balanced BPF is designed with the use of open-loop resonators in [2].…”

Section: Introductionmentioning

confidence: 99%

“…Similar to the other filters, this design demonstrates low selectivity (second-order response), low levels of common-mode suppression (20 dB), and limited levels of tuning (only tunable in bandwidth (BW)). A variety of coupled microstrip line balanced BPFs are presented in [5][6][7][8][9]. However, their shortcomings include center frequency tuning only and low selectivity (first order in [5], second order in [6][7][8], and third order in [9]).…”

Section: Introductionmentioning

confidence: 99%

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High-order and tunable balanced bandpass filters using mixed technology resonators

Simpson

Psychogiou

2021

Int. J. Microw. Wireless Technol.

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This paper reports on high-order balanced bandpass filters (BPFs) that are continuously tunable in terms of frequency and bandwidth and can be intrinsically switched-off. They use a hybrid integration scheme based on two different types of capacitively loaded resonators—ceramic coaxial and microstrip—that reduce the filter size, enhance its out-of-band selectivity and common-mode suppression, and allow for multiple levels of transfer function tuning. High selectivity is obtained in the differential mode due to the high number of poles and transmission zeros present. The common mode is highly suppressed through the introduction of additional transmission zeros and resistively loaded resonators. Furthermore, the use of ceramic coaxial resonators results in supplementary transmission zeros that are used to lower the out-of-band transmission in the differential mode. Multiple levels of tuning are obtained by reconfiguring only the frequency of the BPF's resonators. For experimental validation, a tunable mixed-technology microstrip prototype was manufactured and measured at S-band. It exhibited frequency tuning between 2.22 and 2.94 GHz, bandwidth tuning between 104 and 268 MHz, and an intrinsically switched-off mode with isolation >50 dB in the differential mode. For all states, the common mode was suppressed by at least 35 dB at the center frequency and within a wide range.

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“…Reconfigurable/tunable RF components have become exciting topics for many researchers and design engineers in recent years [ 52 , 53 , 54 ]. To reduce the size of the entire wireless application system and tackle miniaturized RF front-ends with better performance, many pieces of research have been carried out for reconfigurable structures and several microstrip tunable BPFs have been introduced in recent years [ 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 ]. A microstrip reconfigurable BPF using a varactor diode was designed and analyzed to achieve a maintained impedance bandwidth in [ 56 ].…”

Section: Introductionmentioning

confidence: 99%

A Varactor-Based Very Compact Tunable Filter with Wide Tuning Range for 4G and Sub-6 GHz 5G Communications

Al‐Yasir

Parchin

et al. 2020

Sensors

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A very compact microstrip reconfigurable filter for fourth-generation (4G) and sub-6 GHz fifth-generation (5G) systems using a new hybrid co-simulation method is presented in this manuscript. The basic microstrip design uses three coupled line resonators with λ/4 open-circuited stubs. The coupling coefficients between the adjacent and non-adjacent resonators are used to tune the filter at the required center frequency to cover the frequency range from 2.5 to 3.8 GHz. The coupling coefficient factors between the adjacent resonators are adjusted to control and achieve the required bandwidth, while the input and output external quality factors are adjusted to ensure maximum power transfer between the input and output ports. Two varactor diodes and biasing circuit components are selected and designed to meet the targeted performance for the tunable filter. The impedance bandwidth is maintained between 95 and 115 MHz with measured return losses of more than 17 dB and measured insertion loss of less than 1 dB. Computer simulation technology (CST) is utilized to design and optimize the presented reconfigurable filter, with hybrid co-simulation technique, using both CST microwave studio (MWS) and CST design studio (DS), is applied to build the model by considering the SPICE representation for the varactor switches and all electronic elements of the biasing circuit. The introduced reconfigurable microstrip filter is also fabricated using a Rogers RO3010 material with a relative dielectric constant of 10.1 and it is printed on a very compact size of 13 × 8 × 0.81 mm3. An excellent agreement is obtained between the simulation and measurement performance.

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Tunable balanced bandpass filter with constant absolute bandwidth and high common mode suppression

Cited by 10 publications

References 30 publications

Highly‐tunable and wide stopband microstrip bandpass filters

Highly‐tunable and wide stopband microstrip bandpass filters

High-order and tunable balanced bandpass filters using mixed technology resonators

A Varactor-Based Very Compact Tunable Filter with Wide Tuning Range for 4G and Sub-6 GHz 5G Communications

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