Theory and Design of Frequency-Tunable Absorptive Bandstop Filters

Hickle, Mark D.; Peroulis, Dimitrios

doi:10.1109/tcsi.2017.2766206

Cited by 37 publications

(20 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the recent rise in the demand for electromagnetic spectrum due to the increasing spread of microwave and wireless system applications, reconfigurable microwave filters are anticipated to facilitate the growth of modern multi-functional transceivers operating in an immensely vigorous interference environment, without the need for complex and large in size filter banks. In this environment bandstop filters (BSF) [1][2][3][4][5][6][7][8][9] are the key components for elimination of high power-agile interferers close to the desired signal, whereas bandpass filters (BPF) are chosen for the selection of the desired RF signals [10][11][12][13]. Therefore recently, reconfigurable filters have become an essential component in wireless systems and have attracted a lot of attention.…”

Section: Introductionmentioning

confidence: 99%

Novel Selective Feeding Scheme Integrated With SPDT Switches for a Reconfigurable Bandpass-to-Bandstop Filter

et al. 2021

View full text Add to dashboard Cite

This paper demonstrates a new technique for designing high performance reconfigurable bandpass-to-bandstop filters by employing a ring resonator and a selective feeding scheme integrated with single-pole double-throw switches (SPDT). The transformation from bandpass-to-bandstop mode and viceversa is achieved by connecting or disconnecting two λ g /4 open-circuited stubs on the ring using PIN diodes. SPDT switches are employed for electronic switching between two different feeding line sections. In the bandpass state the resonator presents two transmission zeros near the edges of the passband and four attenuation poles inside the passband, enhancing the filter"s performance, thus achieving excellent sharp rejection with high roll-off-rate (ROR 20dB). On the other hand, high stopband rejection with wide bandwidth, good return loss and good skirt-band attenuation rates are achieved in the bandstop state. Even-and oddmode analysis is adopted and closed-form expressions are derived to describe the filter"s behaviour. To verify the validity of the proposed design, a prototype filter was fabricated and measured. In measurement, a 65% 3-dB bandwidth bandpass filter (BPF) with an insertion loss of 0.86 dB was switched to a 70% 20-dB bandwidth bandstop filter (BSF) with more than 40 dB stopband rejection. INDEX TERMS Bandpass filter (BPF), bandstop filter (BSF), PIN diodes, ring resonator, single-poledouble-throw (SPDT).

show abstract

Section: Introductionmentioning

confidence: 99%

Novel Selective Feeding Scheme Integrated With SPDT Switches for a Reconfigurable Bandpass-to-Bandstop Filter

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In practical circuit design, it is impossible to make RL/S 11 equals infinity, however, it is feasible to enhance the attenuation of S 11 for reducing the reflection to the source. The reflectionless filters [1][2][3][4][5][6][7][8] have been overlooked in the past time until recent years they obtain more and more attention.…”

Section: Introductionmentioning

confidence: 99%

“…In [3], design procedure and synthesis method of a third-order coupled-line-based reflectionless BSF is proposed. In [4], a two-pole and a four-pole absorption bandstop filters are presented and have been implemented by varactor-tuned microstrip circuit. In [5], an analytic design method for reflectionless distributedelement bandstop filters are researched, and a second-order Butterworth reflectionless bandstop filter centered at 2 GHz with fractional bandwidth of 8% is designed.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Absorption Reflectionless Bandstop Filter and Its Design Using Multi-Layer Self-Packaged SCPW

Xiao

2020

IEEE Access

View full text Add to dashboard Cite

“…This makes the ability of reconfigurability even more important for an RF front end. For a fully reconfigurable RF system, the core components in the system such as filter, power divider, and antenna should also be reconfigurable …”

Section: Introductionmentioning

confidence: 99%

“…For a fully reconfigurable RF system, the core components in the system such as filter, power divider, and antenna should also be reconfigurable. [3][4][5][6][7] Among the components, the hybrid coupler is considered to be one of the most important ones, as it provides the signals with desired amplitude and phase characteristics for the next module. To support different wireless communication standards, several approaches to achieve the tunability in operating frequency have been proposed in References 8-10.…”

Section: Introductionmentioning

confidence: 99%

A phase tunable hybrid coupler with enhanced bandwidth

Zheng

Long

2019

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

The majority of the previous works on tunable coupler concentrates on the tunability of the frequency and amplitude. The capability to control the phase characteristics draws little attention. However, the tunability in phase becomes more and more important, as the flexible control in phase affects the performance significantly in the modern wireless communication systems. Regarding this, several phase tunable couplers were proposed but with narrow bandwidth. In this article, a novel phase‐tunable coupler with enhanced bandwidth is proposed. It is constructed by introducing two varactor loaded coupled line sections between two branch line sections. By varying the capacitances loaded on and between the coupled lines, the continuously tunable phase difference can be achieved between two output ports without affecting the equal power division characteristics. The analysis of the ideal model and detailed circuit has been conducted to obtain the design formulas and guidelines. For demonstration, a phase tunable coupler operating at 1.8 GHz was designed, fabricated, and measured. It exhibits a tunable phase difference from 60° to 120° by varying the two biasing voltages. Meanwhile, the equal power division, good return loss, and high isolation are still maintained. The desired characteristics have been implemented over a wide bandwidth from 1.6 GHz to 2.0 GHz.

show abstract

Theory and Design of Frequency-Tunable Absorptive Bandstop Filters

Cited by 37 publications

References 22 publications

Novel Selective Feeding Scheme Integrated With SPDT Switches for a Reconfigurable Bandpass-to-Bandstop Filter

Novel Selective Feeding Scheme Integrated With SPDT Switches for a Reconfigurable Bandpass-to-Bandstop Filter

Synthesis of Absorption Reflectionless Bandstop Filter and Its Design Using Multi-Layer Self-Packaged SCPW

A phase tunable hybrid coupler with enhanced bandwidth

Contact Info

Product

Resources

About