A Novel Compact Dual-Frequency Coupled-Line Transformer With Simple Analytical Design Equations for Frequency-Dependent Complex Load Impedance

Wu, Yongle; Sun, Wenguang; Leung, S.W.; Diao, Yinliang; Chan, Kwok Hung

doi:10.2528/pier12101906

Cited by 27 publications

(21 citation statements)

References 19 publications

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“…[7][8][9][10][11][12] Accordingly, dual-band impedance transformers have been presented in Refs. [13][14][15][16][17][18][19][20][21]. In 2003, an extension of the two-section transformer was proposed in Ref.…”

Section: Introductionmentioning

confidence: 99%

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An analytical design method for a novel dual‐band filtering DC‐block impedance transformer

Sun

Jiao

et al. 2017

Micro & Optical Tech Letters

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3B that the average measured in-band return loss and insertion loss of the fabricated Filter are about 13.91 and 2.14 dB, respectively. | C ONCL US I ONA new implementation of the millimeter-wave Filter using GGW technology was presented. The proposed method has the advantages of high performance, low loss, manufacturing flexibility, and compact size. Negative coupling and stacked structure were realized here for the first time in the design of millimeter-wave GGW filter. Finally, a Ka-band filter based on the proposed method was simulated and fabricated to confirm the primary expectations. The simulation and measurement results are in good agreement and exhibit high doublesided selectivity of more than 25 dB/100 MHz. Therefore, a careful comparison between the proposed construction and previous ones demonstrates the unique capability of the proposed structure in terms of the high performance, compactness, and design flexibility. ORCID AbstractIn this paper, a dual-band impedance transformer with filtering integration and DC-block function is proposed for the first time. Excellent frequency selectivity is achieved by the dual-narrowband filtering integration with two pairs of transmission zeros (TZs) at both sides of the dual SUN ET AL.| 233

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Section: Introductionmentioning

confidence: 99%

“…Furthermore, using coupled lines, arbitrary dual-band transformers for matching arbitrary frequency-dependent complex load impedances are developed in Refs. [16][17][18][19]. Due to the coupling structure, DC-block function is also achieved inherently in Ref.…”

Section: Introductionmentioning

confidence: 99%

An analytical design method for a novel dual‐band filtering DC‐block impedance transformer

Sun

Jiao

et al. 2017

Micro & Optical Tech Letters

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“…Furthermore, it can be seen that Z 0 should be larger than Z L in solution Equation (12) and smaller than Z L in solution Equation (27), which means different structures for different cases.…”

Section: Stubbed Coupled Line Section Shunted At the Sourcementioning

confidence: 99%

“…However, it can only design to match purely imaginary loads. In recent years, researchers further focus on the areas of increasing the operating bandwidth and matching a complex impedance load [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A Tri-Band Impedance Transformer Using Stubbed Coupling Line

Wang¹,

Zhang²,

Yin³

et al. 2013

PIER

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Abstract-In this paper, a compact tri-band impedance transformer by utilizing stubbed coupling line for matching a load at three arbitrary frequencies is proposed. The transformer is composed of two parts, and each part is constructed from parallel-coupled transmission lines. Two structures with different configurations of the proposed transformer have been given and analyzed. Then, the close-form equations for the transformer parameters are derived analytically, and the corresponding analytical design approach is verified by numerical examples. To certify the validity of design formulas, an impedance transformer is fabricated and measured at 0.9/1.8/3.2 GHz. Good experimental performances at each frequency are obtained, which are in good agreement with the simulated results.

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“…Usually lumped component based matching networks [22] are simpler, but fabrication of lumped component is difficult at higher frequencies and maintaining their value over a wide frequency range is extremely difficult [23]. Furthermore, few coupled line based dual-band impedance transformers exhibiting good performance have been reported and in general they may or may not provide inherently DC blocking [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

A T-Section Dual-Band Matching Network for Frequency-Dependent Complex Loads Incorporating Coupled Line With Dc-Block Property Suitable for Dual-Band Transistor Amplifiers

Maktoomi¹,

Hashmi²,

Ghannouchi³

2014

PIER C

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Abstract-This paper reports design of a new dual-band T-type impedance transformer also exhibiting DC-blocking feature. The design aims at achieving matching for frequency-dependent complex loads having distinct values at two arbitrary frequencies to Z s (here, 50 Ω). A step-wise analysis on the developed dual-band impedance transformer provides simple closed-form design equations. The design is verified by simulation in Agilent ADS. For experimental verification a PCB prototype is fabricated using FR-4 material, operating at 1.45 GHz and 2.61 GHz. A good result is obtained confirming the theory and simulation.

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A Novel Compact Dual-Frequency Coupled-Line Transformer With Simple Analytical Design Equations for Frequency-Dependent Complex Load Impedance

Cited by 27 publications

References 19 publications

An analytical design method for a novel dual‐band filtering DC‐block impedance transformer

An analytical design method for a novel dual‐band filtering DC‐block impedance transformer

A Tri-Band Impedance Transformer Using Stubbed Coupling Line

A T-Section Dual-Band Matching Network for Frequency-Dependent Complex Loads Incorporating Coupled Line With Dc-Block Property Suitable for Dual-Band Transistor Amplifiers

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