Dual-Frequency Impedance Transformer with Ultra- High Impedance Transformation

Gupta, Rahul; Shaikenov, Olzhas; Kairatova, Sabina; Dautov, Kassen; Hashmi, Mohammad S.

doi:10.1109/apmc46564.2019.9038459

Cited by 1 publication

(2 citation statements)

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“…The transformation ratios are limited by the line separation of C-section coupled lines, which tend to achieve unrealisable values on extension. A coupled line cascaded with planar transmission line architecture has been reported in [20]. The proposed design facilitates an impedance transformation ratio range from 0.1 till 10 at frequency ratios between 2 and 7.…”

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%

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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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Section: Introductionmentioning

confidence: 99%