Coupling Matrix-Based Design of Fully Reconfigurable Differential/Balanced RF Filters

Simpson, Dakotah; Psychogiou, Dimitra

doi:10.1109/lmwc.2018.2866175

Cited by 23 publications

(20 citation statements)

References 6 publications

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“…Conventionally, for filter designs, bulk metals such as Copper with a conductivity of 6e7 S/m and low-loss microwave substrates are used. The Q for planar resonators, realized in the arrangement mentioned above, is typically in the range of 200 to 300 [27]- [29]. This has also been verified from EM simulations, where a planar line resonator (shown in Fig.…”

Section: A Performance Estimation Through Ideal Filterssupporting

confidence: 57%

Additively Manufactured Dual-Mode Reconfigurable Filter Employing VO₂-Based Switches

Yang

Vaseem

et al. 2020

IEEE Trans. Compon., Packag. Manufact. Technol.

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Modern wireless devices operate on multiple frequency bands, and thus can benefit from frequency reconfigurable Radio Frequency (RF) components, especially filters as they are typically larger in size and are required for every frequency band. In addition, many applications such as wearable electronics, desire stable performance from the devices when they are bent or flexed. However, most of the reconfigurable filters are built on rigid substrates and utilize expensive discrete RF switches, which need to be soldered to the filters. In this work, we present a fully printed filter that achieves reconfigurability through printed Vanadium Dioxide (VO2) based switches, which are extremely low cost and do not require any soldering for their attachment. The filter design is based on a dual-mode resonator which enables a second-order filter despite a single resonator, thus helping in making the filter compact. It also helps in maintaining a decent insertion loss (2.6 dB), despite relatively low conductivity of the metallic ink. The switches, when activated thermally through a printed heater at the backside, reconfigure the frequency from 4 GHz to 3.75 GHz. The filter has been realized on a flexible Kapton substrate, making the filter conformable to any surface. Measurements under various bending conditions reveal stable performance, making this filter design suitable for a number of wearable and Internet of Things applications.

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Section: A Performance Estimation Through Ideal Filterssupporting

confidence: 57%

Additively Manufactured Dual-Mode Reconfigurable Filter Employing VO₂-Based Switches

Yang

Vaseem

et al. 2020

IEEE Trans. Compon., Packag. Manufact. Technol.

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“…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%

“…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 . The majority of research for useful CABW filters are the two‐pole BAL‐FA‐BPFs, because of their simpler coupling scheme, wide FTR, stable CABW, and single‐DC‐bias control.…”

Section: Introductionmentioning

confidence: 99%

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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

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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

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“…It represents the development trend and ideal state of tunable filter. In order to better filter and select frequency in the environment where frequency resources are scarce, scholars have done a lot of research on fully adjustable filter [5,6,7,8,9,10]. The realization of tunable function can be realized by mechanical method, loading electric element, magnetic material [11] and so on.…”

Section: Introductionmentioning

confidence: 99%

A high stability fully tunable filter with frequency, bandwidth and transmission zero tuning

Zhang

Zhu

Meng

et al. 2019

IEICE Electron. Express

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Based on the double folded 1/4 mode substrate integrated waveguide (DFQMSIW) resonator, a two-pole DFQMSIW tunable filter with frequency, bandwidth and transmission zeros tuning is proposed in this paper. In order to increase the stability of the filter, the constant bandwidth can be maintained by changing the coupling coefficient by two varactor diodes when tuning frequency and transmission zeros. The center frequency can be tuned in the range of 1.1 GHz-1.9 GHz, transmission zeros can be tuned from 1.41 GHz to 1.5 GHz with bandwidth unchanged, and bandwidth can be tuned from 120 MHz to 200 MHz. The insertion loss is about −1.3 dB to −3 dB.

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Coupling Matrix-Based Design of Fully Reconfigurable Differential/Balanced RF Filters

Cited by 23 publications

References 6 publications

Additively Manufactured Dual-Mode Reconfigurable Filter Employing VO₂-Based Switches

Additively Manufactured Dual-Mode Reconfigurable Filter Employing VO₂-Based Switches

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

A high stability fully tunable filter with frequency, bandwidth and transmission zero tuning

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