Wideband and Compact Impedance-Transforming 90° DC Blocks With Symmetric Coupled Transmission-Line Sections

Ahn, Hyeong-Joon; Tentzeris, Manos M.

doi:10.1109/tcpmt.2018.2838327

Cited by 6 publications

(1 citation statement)

References 26 publications

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“…A Chebyshev polynomial is also used to constrain the equal-ripple response in filter and IT designs [28][29][30]. To realize DC block and reduce the circuit size, coupled line sections (CLSs) are widely used in wideband ITs and filters [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. For example, two CLSs are added to each terminal of the stepped-impedance TLs symmetrically to integrate the filtering function [30].…”

Section: Introductionmentioning

confidence: 99%

A Novel Synthetization Approach for Multi Coupled Line Section Impedance Transformers in Wideband Applications

et al. 2022

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In this paper, a novel synthetization approach is proposed for filter-integrated wideband impedance transformers (ITs). The original topology consists of N cascaded coupled line sections (CLSs) with 2N characteristic impedance parameters. By analyzing these characteristic impedances, a Chebyshev response can be derived to consume N + 2 design conditions. To optimize the left N − 2 variable parameters, CLSs were newly substituted by transmission lines (TLs) to consume the remaining variable parameters and simplify the circuit topology. Therefore, there are totally 2N − N − 2 substituting possibilities. To verify the proposed approach, 25 cases are listed under the condition of N = 5, and 7 selected cases are compared and discussed in detail. Finally, a 75–50 Ω IT with 100% fractional bandwidth and 20 dB bandpass return loss (RL) is designed and fabricated. The measured results meet the circuit simulation and the EM simulation accurately.

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Section: Introductionmentioning

confidence: 99%

A Novel Synthetization Approach for Multi Coupled Line Section Impedance Transformers in Wideband Applications

et al. 2022

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Balanced‐to‐unbalanced power dividers for arbitrary power division ratios and forarbitrary real termination impedances

Ahn

Tentzeris

2019

IET Microwaves, Antennas & Propagation

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Novel balanced-to-unbalanced power divider (BUPD) is introduced for arbitrary power division ratios and for arbitrary real termination impedances. It consists of one 180° transmission-line section (TL), two different 90° TLs and one isolation circuit comprising two different resistances and two different 90° TLs. Due to the arbitrary termination impedances, the conventional ways for the even-and odd-mode excitation analyses are impossible, requiring a new design method. Under the assumption of the perfect isolation between two output ports, the BUPD can be divided into two, based on which the design formulas for the characteristic impedances of all the TLs can be successfully derived. Then, the scattering parameters are inversely derived, which is quite different from the conventional ways where the design formulas are derived based on the scattering parameters. For the verification of the suggested theory, one prototype for the power division ratio of 5 dB and for the termination impedances of 60, 40 and 50 Ω is tested. The measured frequency responses are in good agreement with the predicted ones.

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Miniaturization of Microwave Devices by Using Three-Dimensional Strip Line Design

Thanh,

Malyutin,

Bilevich

2023

2023 IEEE XVI International Scientific and Technical Conference Actual Problems of Electronic Instrument Engineering (APEIE)

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Wideband and Compact Impedance-Transforming 90° DC Blocks With Symmetric Coupled Transmission-Line Sections

Cited by 6 publications

References 26 publications

A Novel Synthetization Approach for Multi Coupled Line Section Impedance Transformers in Wideband Applications

A Novel Synthetization Approach for Multi Coupled Line Section Impedance Transformers in Wideband Applications

Balanced‐to‐unbalanced power dividers for arbitrary power division ratios and forarbitrary real termination impedances

Miniaturization of Microwave Devices by Using Three-Dimensional Strip Line Design

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