Coupled Transmission Lines as Impedance Transformer

Jensen, Thomas; Zhurbenko, Vitaliy; Krozer, Viktor; Meincke, Peter

doi:10.1109/tmtt.2007.909617

Cited by 79 publications

(64 citation statements)

References 6 publications

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“…The implementation method for impedance transformer by using coupled transmission lines has also attracted the attention of many researchers [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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

Wu¹,

Sun²,

Leung³

et al. 2013

PIER

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Abstract-In order to perfectly match arbitrary frequency-dependent complex load impedances at two uncorrelated frequencies, a novel coupled-line impedance transformer without transmission-line stubs is proposed in this paper. This transformer mainly features small size, wide bandwidth, simple analytical design method, and easy planar implementation. The transformer simply consists of a coupledline section and an additional transmission-line section. Due to the usage of a coupled-line section, the theoretical synthesis of the proposed transformer becomes very simple when compared with previous transformers and the total size of the planar circuit without deterioration of operating bandwidth becomes small. Furthermore, several numerical examples are presented to demonstrate the flexible dual-frequency matching performance. Finally, the profile of matching frequency-dependent complex load impedance at two arbitrary frequencies has been examined by simulation and measurement of two microstrip generalized T -junction power dividers. Good agreement between the calculated results and measured ones justifies this proposed transformer and the design theory.

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“…The implementation method for impedance transformer by using coupled transmission lines has also attracted the attention of many researchers [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The required evenand odd-mode impedance of coupled lines cannot be easily realized in microstrip technology. In [14], a novel coupled-line impedance transformer has been developed. This impedance transformer can match real and complex loads in both narrow and wide frequency bands.…”

Section: Introductionmentioning

confidence: 99%

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

Wu¹,

Sun²,

Leung³

et al. 2013

PIER

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“…The even mode circuit of the modified Marchand balun is shown on figure 2. In [7] the two-port Z-parameters for a couple line loaded at the coupled and thru port with Z s2 and Z m respectively is given as…”

Section: Discussionmentioning

confidence: 99%

“…In [7] the idea of using a coupled line, reactively loaded on the thru and coupled ports, for complex impedance matching was suggested. We will expand this idea to the Marchand balun, constructing it of two of such types of coupled lines.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of complex impedance transforming marchand baluns

Michaelsen

Johansen

Tamborg³

2014

2014 20th International Conference on Microwaves, Radar and Wireless Communications (MIKON)

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Abstract-A new type of Marchand balun is presented in this paper, which has the property of complex impedance transformation. To allow the Marchand balun to transform between arbitrary complex impedances, three reactances should be added to the circuit. A detailed analysis of the circuit gives the governing equations. To verify the theory, a design and electromagnetic simulation of a lumped element Marchand balun is made in a SiGe BiCMOS technology. The lumped element impementation is favorable because capacitors are placed where the additional reactances should be added. Thus it is possible to absorb a positive reactance by reducing a capacitor. At the design frequency of 10.5 GHz it matches 50Ω to 50 − j66Ω. It has an insertion loss of 5.1 dB, an input reflection of -20.8 dB, as well as phase and magnitude imbalance better than 0.2• and 0.12 dB, respectively.

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“…In recent years, coupled transmission lines have been suggested as a matching element due to greater flexibility and compactness in comparison to quarter wavelength transmission lines (Jensen et al, 2007). It has been demonstrated that matching real and complex loads with coupled lines leads to more compact realizations and could therefore become important at millimeter-wave frequencies for on-chip matching solutions.…”

Section: Coupled Line Transformersmentioning

confidence: 99%