Realization of Extremely High and Low Impedance Transforming Ratios Using Cross-Shaped Impedance Transformer

Zhu, Hong‐Xu; Cheong, Pedro; Ho, Sut‐Kam; Tam, Kam‐Weng; Choi, Wai‐Wa

doi:10.1109/tcsii.2019.2935499

Cited by 11 publications

(8 citation statements)

References 27 publications

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“…The performance comparison of the proposed IT with previously reported works is shown in Table 3. As observed from this table, the proposed IT provides bandpass filtering response as well as center‐frequency tunability capability, which was not possible in previously reported works 8–23 …”

Section: Simulation and Measurement Resultsmentioning

confidence: 76%

“…As observed from this table, the proposed IT provides bandpass filtering response as well as center-frequency tunability capability, which was not possible in previously reported works. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]…”

Section: Simulation and Measurement Resultsmentioning

confidence: 99%

“…Using multi‐section coupled line and modified coupled line, the wideband ITs are presented in References 16–18. In References 19–21, ITs with extremely low or high impedance transforming are presented. More recently, the multi‐band ITs are presented in References 22–23.…”

Section: Introductionmentioning

confidence: 99%

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A design of impedance transformer with tunable center frequencies using filter synthesis approach

Chaudhary

Jeong

2022

Int J RF Mic Comp-Aid Eng

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Microwave impedance transformer (IT) with center frequency tunable capability is one of great research issue for better utilization of frequency spectrum resources and system miniaturization of next generation wireless communication systems. This article presents a filter synthesis approach for designing IT with center frequency tunable capability using single dc-bias controlled tunable resonators. The proposed IT provides bandpass filtering response and is designed by properly coupling quarter-wave tunable resonators with alternate J-and K-inverters. The J-inverters are realized using a parallel-coupled line, whereas K-inverter is implemented with T-type short-circuited TL. Using filter theory, analytical design equations are derived to calculate the circuit parameters. The center frequency of the proposed IT is tuned over a wide frequency tuning range (FTR) by changing the varactor diode capacitance of quarterwave resonators. For experimental demonstration, a prototype of 25-to-50 Ω IT is designed, simulated, and measured. The measured results confirmed that the center frequency of the proposed IT is tuned from 2.05 to 2.91 GHz (860 MHz or 34.68% FTR) with an insertion loss variation of 2.57 to 1.76 dB.

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Section: Simulation and Measurement Resultsmentioning

confidence: 76%

Section: Simulation and Measurement Resultsmentioning

confidence: 99%

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A design of impedance transformer with tunable center frequencies using filter synthesis approach

Chaudhary

Jeong

2022

Int J RF Mic Comp-Aid Eng

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“…An early report [11] has addressed the case of improving the impedance transformation ratio but only for single‐band operation. Recently [21], a cross‐coupled architecture for impedance transformers capable of handling extreme load values was reported. The design claims an impedance transformation ratio of 0.1 to 40 but only for single‐band operation with moderate design flexibility.…”

Section: Introductionmentioning

confidence: 99%

“…The pressing needs of emerging wireless applications over the years have directed considerable research to multiband devices. The existing literature is replete with dual‐band impedance transformer architectures [1–21], but most of them have fundamental limitations, namely, a lower frequency ratio (r) and impedance transformation ratio (k) [3–10]. The well‐known Monzon transformer [2] theoretically allows very high values for the frequency and impedance transformation ratios, but the obtained design parameters become highly restricted because of fabrication limits.…”

Section: Introductionmentioning

confidence: 99%

Flexible ultra‐high transformation ratio‐based dual‐band impedance transformer and its applications in a T‐junction power divider

Banerjee

Hashmi

Ghannouchi

2021

IET Microwaves Antenna & Prop

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A design scheme is presented for an all-pass coupled-line (APCL)-based dual-band impedance-matching network. Salient features include a highly flexible frequency ratio (r) (high of 15 and low of 1.2) and impedance transformation ratio (k) (high of 9 and low of 0.2) simultaneously at two arbitrary, uncorrelated frequencies of interest. The design strategy consists of two APCL sections and a stub that prove to be simple and easy to prototype. Detailed mathematical modelling and graphical interpretations have been presented. Closed-form design equations have been developed and backed up with design examples. Two dual-band T-junction power dividers (TPDs) have been designed to demonstrate the application of the proposed impedance transformer at two widely separated frequencies. RO4350 B-and RO5880-based prototypes have been fabricated for both the matching network and the TPD to validate the proposed theory. The measurement results demonstrate an achievable frequency ratio of 15 and an impedance transformation ratio of 9 in simultaneous operation mode.This is an open access article under the terms of the Creative Commons Attribution-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited and no modifications or adaptations are made.

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Microwave angular displacement sensor with wideband matching and impedance transforming

Zhu

Cheong

Tam

et al. 2023

Electronics Letters

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This work proposes a microwave angular displacement sensor with wideband matching based on a wideband impedance transformer. According to the design requirement of the microstrip impedance transformer (load‐to‐source impedance of 250‐to‐50 Ω, centre frequency of 2.40 GHz) with Chebyshev frequency response, the proposed angular displacement sensor is explored for the high bandwidth sensitivity of 11.18 MHz/degree.

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Realization of Extremely High and Low Impedance Transforming Ratios Using Cross-Shaped Impedance Transformer

Cited by 11 publications

References 27 publications

A design of impedance transformer with tunable center frequencies using filter synthesis approach

A design of impedance transformer with tunable center frequencies using filter synthesis approach

Flexible ultra‐high transformation ratio‐based dual‐band impedance transformer and its applications in a T‐junction power divider

Microwave angular displacement sensor with wideband matching and impedance transforming

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