A Novel Coupled-Line Tunable Wilkinson Power Divider With Perfect Port Match and Isolation in Wide Frequency Tuning Range

Shen, Xiaochuan; Wu, Yongle; Zhou, Siyue; Liu, Yuanan

doi:10.1109/tcpmt.2016.2565601

Cited by 26 publications

(14 citation statements)

References 16 publications

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“…The chosen values of lumped elements including DC-block capacitors C b , RF-block inductors L c , current-limiting resistances R b , and varactors C 1 and C 2 (SMV1281-011LF SKY-WORKS SOD323) [39] are listed as follows: C b = 4.7 nF, L c = 3.3 uH, R b = 10 k , and C 1 (C 2 ) = 0.69-13.30 pF. As demonstrated in [1], four DC-block capacitors C b are adopted to isolate two tunable voltages, which are located between coupled line and microstrip line. In addition, two capacitors C b are placed to eliminate the influence of DC voltages on ports.…”

Section: B Implementation and Measured Resultsmentioning

confidence: 99%

“…Reconfigurable or high-performance microwave devices, such as power dividers [1]- [3], phase shifters [4]- [7], couplers [8]- [10], and filters [11]- [33], are extensively studied in past several years. Due to the reconfigurability, these key components used in modern wireless communication systems are capable to realize the agile frequency to support different standards, as well as reduce the size and complexity of systems.…”

Section: Introductionmentioning

confidence: 99%

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Simple Coupled-Line Tunable Bandpass Filter With Wide Tuning Range

Chen

Yang

et al. 2020

IEEE Access

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In this paper, a tunable bandpass filter using coupled line with a wide tuning range is proposed. The proposed filter has a simple structure which is composed of a coupled-line section and two pairs of varactors. Meanwhile, simultaneously tuning on bandwidth and center frequency are introduced by varactors. The tunability is mainly realized by varactors connected to one end of the coupled line and varactors between ports and coupled line provide an impedance matching. A theoretical analysis is presented to illustrate the tunability by using even-and odd-mode theory. Additionally, the detailed effect of the two types of varactors is researched, respectively. To verify the concept, a prototype is designed, fabricated, and measured. The transmission zero exhibited in measurement is introduced by bias circuits. The measured results show that the tunable bandpass filter achieves a tunable center frequency of 0.494-1.257 GHz (87.15%) and a 3-dB bandwidth of 0.282-0.943 GHz (334%). INDEX TERMS Bandpass filter, coupled line, tunable filter, wide tuning range.

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Section: B Implementation and Measured Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simple Coupled-Line Tunable Bandpass Filter With Wide Tuning Range

Chen

Yang

et al. 2020

IEEE Access

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“…The current‐limiting resistors R bias of 10.0 kΩ and RF‐choke inductors L bias of 3.3 μH are exploited for the two biasing circuits. As suggested in [7], four DC block capacitors C block of 10.0 μF are mounted between two biasing circuits to independently control the two voltages, and three more at all ports to protect the vector network analyser from DC.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…The current-limiting resistors R bias of 10.0 kΩ and RF-choke inductors L bias of 3.3 μH are exploited for the two biasing circuits. As suggested in [7], four DC block capacitors C block of 10.0 μF are mounted between two biasing circuits to independently control the two voltages, and three more at all ports to protect the vector network analyser from DC. Full-wave simulation and measurement are conducted by using a high-frequency structure simulator and an R&S vector network analyser ZVA-8, and the relevant frequency responses are separately plotted in Figs.…”

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confidence: 99%

Bandwidth‐tunable filtering balun based on compact 3D configuration

Yao

et al. 2019

Electron. lett.

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For the first time, a novel bandwidth-tunable filtering balun based on compact 3D configuration is presented. The overall design is basically composed of a two-layer horizontal feeding plane, a three-layer vertically mounted plane, and the transmission-line circuits disposed on both. Implementing the ring resonator in vertical double-sided parallel-strip line, the complete horizontal ground and frequencyindependent phase difference are subtly combined. Connecting the shunt varactor diodes with the inserted vertical ground, the desirable filtering property and flexible bandwidth tunability are splendidly fulfilled. A prototype balun centred at 1.53 GHz is fabricated. The measured operating bandwidth is dynamically tuned from 0.87 to 1.23 GHz with a return loss <−10 dB, forcefully validating the design concept.

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“…These features are suitable for the need and complex environmental condition. The main principle of traditional frequency-tunable microwave structure is that the characteristic impedance of the transmission line is continuously changed by inserted varactorsfor example and can construct parallel varactors [3], series varactors [4], or a mixture of the parallel and series varactors [5] in the transmission lines.…”

Section: Introductionmentioning

confidence: 99%

Frequency-Tunable Phase Inverter Based on Slot-Line Resonator

Liao¹,

Zhang²

2017

PIER Letters

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This paper describes a frequency-tunable phase inverter based on a slot-line resonator for the first time. The control circuit is designed and located on the defected ground. None of dc block capacitors are needed in the microstrip line. A wide tuning frequency range is accomplished by the use of the slot-line resonator with two varactors and a single control voltage. A 180-degree phase inverter is achieved by means of reversing electric field with two metallic via holes connecting the microstrip and ground plane. The graphic method is used to estimate the operation frequency. For verification, a frequency-tunable phase inverter is fabricated and measured. The measured results show a wide tuning frequency range from 1.1 GHz to 1.75 GHz with better than 20-dB return loss. The measured results are in good agreement with the simulated ones.

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A Novel Coupled-Line Tunable Wilkinson Power Divider With Perfect Port Match and Isolation in Wide Frequency Tuning Range

Cited by 26 publications

References 16 publications

Simple Coupled-Line Tunable Bandpass Filter With Wide Tuning Range

Simple Coupled-Line Tunable Bandpass Filter With Wide Tuning Range

Bandwidth‐tunable filtering balun based on compact 3D configuration

Frequency-Tunable Phase Inverter Based on Slot-Line Resonator

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