Traveling Waves and Power Waves: Building a Solid Foundation for Microwave Circuit Theory

Williams, Dylan F.

doi:10.1109/mmm.2013.2279494

Cited by 34 publications

(13 citation statements)

References 17 publications

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“…It is noted that the analysis in [8] implicitly employed the concept of power-wave [9] and its parameter conversion table [10]. Despite providing reasonably accurate results in most cases, this is indeed not the best theory to handle traveling-wave due to the discontinuity property of the power-wave [7], [11], [12]. To avoid the use of power wave and bypass this issue, the present paper provides a thorough analysis of a LWA based on a general waveguide circuit theory of traveling-wave as found in [7].…”

Section: Introductionmentioning

confidence: 99%

Transmission-Line Model of Nonuniform Leaky-Wave Antennas

Nguyen‐Trong

Hall

Fumeaux

2016

IEEE Trans. Antennas Propagat.

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Abstract-Non-uniform leaky-wave antennas (LWAs) are analyzed and synthesized using a lossy transmission line model. The analysis is based on a general waveguide circuit theory. Compared to the classical approach, the model yields a higher accuracy in the computation of both aperture field distribution and radiation patterns. The proposed analysis is also able to provide scattering parameters of the whole structure in a fraction of a second, which is valuable for antenna optimization. Based on the analysis, a general method for far-field pattern synthesis utilizing global optimization is presented. As an application demonstration, the Half-Mode Substrate-Integrated Waveguide, or half-width microstrip line, has been selected as basis structure for the LWA designs. Two antennas have been optimized targeting different specifications, i.e. a low sidelobe level and a wide null in the radiation pattern. Experimental results are provided for these selected examples of non-uniform LWAs, which ultimately validate the proposed technique as an improvement over the classical approach.Index Terms-Leaky-wave antenna (LWA), pattern synthesis, transmission line model, non-uniform structure, HalfMode Substrate-Integrated Waveguide (HMSIW), half-width microstrip line.

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Section: Introductionmentioning

confidence: 99%

Transmission-Line Model of Nonuniform Leaky-Wave Antennas

Nguyen‐Trong

Hall

Fumeaux

2016

IEEE Trans. Antennas Propagat.

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“…An interesting characteristic of can be further found for the real frequency as (9) Thus, by using (8) and (9), a new important relationship can be easily derived as (10) Using the relation (10), the expressions (4)-(6) can be further simplified to obtain the general synthesis formulas (11)…”

Section: Synthesis Methodsmentioning

confidence: 99%

“…The concept of the power waves [9], [10], a more general form of the traveling waves, is utilized to extend the definition of scattering parameters with complex terminations. Once the transmission function is obtained by conventional recursion techniques, the objective scattering matrix can be directly converted into an admittance matrix using new general formulas.…”

Section: Introductionmentioning

confidence: 99%

A General Synthesis Approach of Coupling Matrix With Arbitrary Reference Impedances

Ge¹,

Zhu²,

Jiang³

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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In this letter, a general approach is presented to synthesize the coupling matrix that matches to arbitrary frequency-invariant complex source and load. The approach converts the objective scattering matrix and reference impedances into an admittance matrix of multicoupled circuit based on the definition of power wave. The proposed method was verified by numerical and also simulated tests carried out with various complex reference impedances.

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“…Therefore, the transformation of the calibration reference impedance to the system of 50 Ω reference impedance (i.e. to "pseudo S-parameters", [18]) may not be required for the majority of measurement tasks. The remaining practical limitation of the mTRL, however, is the relatively big size of the test chip taken by calibration standards and the need to re-position wafer probes during calibration procedure.…”

Section: A On-wafer Calibrationmentioning

confidence: 99%

On-wafer small-signal and large-signal measurements up to sub-THz frequencies

Krozer

Doerner

Schmuckle

et al. 2014

2014 IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM)

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Recent advances in MMIC technology have opened the possibilities for circuit operation in the THz range. There are numerous examples of BiCMOS and III-V compound device technologies with demonstrated performance beyond 600 GHz. Characterization of such MMIC are predominantly performed on-wafer in a planar environment. However, on-wafer characterization facilities do not fully keep pace with MMIC development in terms of frequency and power.The paper discusses issues involved in on-wafer calibration at mm-wave frequencies, which is the basis for accurate measurements and characterization of active and passive device. Subsequently, the paper discusses mm-wave interconnect characterization. Lowloss interconnects are important for mm-wave MMIC, especially in case of heterogeneous integration. Finally, a novel heterogeneous integration approach of bipolar technologies, using both BiCMOS and InP DHBT processes is presented. This approach heavily relies on low-loss interconnects and accurate device modelling. It will be shown that accurate large-signal models can be efficiently extracted from well-calibrated on-wafer multi-bias small-signal measurements, but verification is difficult due to calibration difficulties at mm-wave frequencies.

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Traveling Waves and Power Waves: Building a Solid Foundation for Microwave Circuit Theory

Cited by 34 publications

References 17 publications

Transmission-Line Model of Nonuniform Leaky-Wave Antennas

Transmission-Line Model of Nonuniform Leaky-Wave Antennas

A General Synthesis Approach of Coupling Matrix With Arbitrary Reference Impedances

On-wafer small-signal and large-signal measurements up to sub-THz frequencies

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