Wideband Tunable Differential Bandstop Filter Based on Double-Sided Parallel-Strip Line

Cai, Jing; Yang, Yongjie; Qin, Wei; Chen, Jianxin

doi:10.1109/tcpmt.2018.2794993

Cited by 16 publications

(23 citation statements)

References 27 publications

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“…The filters applying stepped-impedance resonators are studied in recent years [18][19][20][21][22][23]. A microstrip low-pass filter (LPF) with three coupled stepped impedance resonators is presented in [21].…”

Section: Motivation and Related Workmentioning

confidence: 99%

A Novel Method to Design Stub-loaded Microstrip Filters with Arbitrary Passband Based on the Reflection Theory and Monte Carlo Method

H.¹,

Yuan²,

Yuan³

2019

RADIOENGINEERING

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In this paper, a novel method to design microstrip filters with arbitrary passband is proposed. A kind of stubloaded microstrip filter with asymmetric structure is proposed in this paper. The mathematic function of the total reflection coefficient at the input port of the filter is derived based on the reflection theory, and an ultra-wide-band (UWB) filter which can work from 11 GHz to 39 GHz is fabricated and measured to verify that our function can calculate the reflection coefficient precisely. The circuit model of this UWB filter is provided, and the comparison between frequency responses of the circuit simulation and the calculation results justifies the validity of our proposed method. The procedure based on the Monte Carlo method to design stub-loaded microstrip filters with arbitrary passbands is given in this paper. A bandpass filter (BPF) which can work on 7-9.5 GHz is designed and measured as an example. The comparison between calculated dimensions and practical dimensions of this filter shows a satisfactory fitting degree. Then the proposed method is compared with the Chebyshev filter design method to show the advantages of our proposed method. A low-pass filter (LPF) which can work below 4 GHz is designed and compared with some prior arts in order to show that our proposed filter is simple in structure and small in size. At last, the adaptabilities of our proposed method in narrow band and multi-band situations are discussed in this paper. By using our proposed method, the stub-loaded microstrip filter can be designed quickly and easily. Based on the results mentioned above, we can count that the method proposed in this paper has a good application in microstrip filter design.[30] DONG, X. M., ZHOU, D. X. Learning gradients by a gradient descent algorithm. His research interests include microwave circuits design, wireless communication and wave propagation.

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Section: Motivation and Related Workmentioning

confidence: 99%

A Novel Method to Design Stub-loaded Microstrip Filters with Arbitrary Passband Based on the Reflection Theory and Monte Carlo Method

H.¹,

Yuan²,

Yuan³

2019

RADIOENGINEERING

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“…Therefore, it is important to incorporate reconfiguration with multiband differential BSF. So far, tunability has been discussed for differential BSF with single frequency band response in [9,10]. However, these two designs are very complex due to the employment of substrate integrated waveguide resonators and double-sided parallel-strip line, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…However, these two designs are very complex due to the employment of substrate integrated waveguide resonators and double-sided parallel-strip line, respectively. Also, the CM insertion loss associated with the design in [10] is very high which limits the possibility of obtaining the optimum CMRR with it. In [11], a multiband differential BSF is presented, but it is not tunable.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Compact Balanced Multiband Fully Reconfigurable Bandstop Filter

Borah¹,

Kalkur²

2020

PIER C

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This paper introduces a balanced (differential) multiband reconfigurable (tunable) bandstop filter (BSF) using all lumped elements. The main features of the design include its ultra-compact size as well as flexibility to control any frequency band independently in terms of both center frequency and absolute bandwidth (ABW). In the proposed structure, the corresponding non-resonating nodes (NRN) of the symmetrical bisections are connected to N number of LC π-circuits (N-band cell) through capacitors. Again, in each symmetrical bisection, K number of NRNs are series cascaded through LC π-circuits. This results in a Kth order N-band stopband (notch) response in differential mode (DM) operation whereas provides a passband response when excited by a common mode (CM) signal. Reconfiguration of any DM stopband is obtained by using tunable capacitors for the corresponding LC π-circuit in each N-band cell and also, for its coupling capacitors to the NRNs. To validate the proposed topology, a dualband differential tunable BSF is designed and fabricated where both DM stopbands are controlled independently in the range of 1.16 GHz-1.32 GHz. Also, the bandwidth of each band is varied independently by 20-50 MHz without affecting the other band. At any tuning state, DM stopband rejection for each band is found to be ≥ 19 dB, resulting in a minimum CMRR value of 19 dB. The fabricated prototype occupies an area of 0.13λ g × 0.04λ g (21 mm × 7 mm) where λ g is the guided wavelength at the center frequency of the entire spectral range, and the experimental results show a good agreement with the simulation results.

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“…So far, many articles have been found to concentrate on balanced bandpass filter with different characteristics such as ultra-wideband, narrowband, tunable, dualband, high-selectivity and high common mode suppression. However, insertion of a tunable bandpass filter into a communication system cause inevitable insertion loss due to the parasitic resistance associated with the varactors [6]. It gets worse as the resonant frequency moves towards lower value.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, there is only a limited literature available in the field of balanced bandstop filter. In [1] and [6], CM noise of a single-band tunable balanced BSF is suppressed by using magnetic field property of Substrate Integrated Waveguide (SIW) resonators and balanced properties of double-sided parallel-strip line (DSPSL), respectively. The design procedure of each of these two designs is very complex.…”

Section: Introductionmentioning

confidence: 99%

Tunable Multiband Balanced Bandstop Filter With High CMRR

Borah¹,

Kalkur²

2019

PIER C

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A novel and effective architecture of tunable multiband balanced bandstop filter (MBBSF) is introduced for the first time in this paper. Each symmetrical bisection of the proposed branch line structure consists of K series cascaded tunable N-band sections to realize a reconfigurable K-th order N-band response in differential mode (DM) operation. The main advantage lies on the fact that all these N bands can be tuned simultaneously or each band independently. Moreover, it maintains a high common mode rejection ratio (CMRR) for all the tuning states by incorporating open stubs in the symmetrical plane of the balanced structure. To validate the proposed topology, a balanced dualband tunable BSF is designed where the two DM stopbands tune in the range of 1.16 GHz-1.29 GHz and 1.6 GHz-1.76 GHz, respectively. The lower and upper bands maintain a constant absolute bandwidth (ABW) of 115 MHz and 135 MHz, respectively, and stopband rejection is better than 20 dB for each band. The fabricated prototype occupies an area of 0.31λ 2 g , and the experimental results show a good agreement with the simulation results.

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Wideband Tunable Differential Bandstop Filter Based on Double-Sided Parallel-Strip Line

Cited by 16 publications

References 27 publications

A Novel Method to Design Stub-loaded Microstrip Filters with Arbitrary Passband Based on the Reflection Theory and Monte Carlo Method

A Novel Method to Design Stub-loaded Microstrip Filters with Arbitrary Passband Based on the Reflection Theory and Monte Carlo Method

Ultra-Compact Balanced Multiband Fully Reconfigurable Bandstop Filter

Tunable Multiband Balanced Bandstop Filter With High CMRR

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