Design of Conical Transmission Line Power Combiners Using Tapered Line Matching Sections

Villiers, Dirk I. L. de; Walt, P.W. van der; Meyer, P.

doi:10.1109/tmtt.2008.923879

Cited by 39 publications

(31 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In microwave matching circuit design, especially when one needs to match real load impedances, one of the most useful network is a tapered microwave matching network which can be considered as a series of cascaded quarter wavelength transmission lines. The design for tapered lines is usually done by using computer algorithms for continuous sections [40], [41]. For this kind of structure design optimization using nature-inspired metaheuristic methods, namely, particle swarm optimization, was done [10].…”

Section: Microwave Tapered Matching Circuit Designmentioning

confidence: 99%

Core Levels Algorithm for Optimization: Case of Microwave Models

Haydar¹,

Ülker²,

Dimililer³

et al. 2017

ijacsa

View full text Add to dashboard Cite

Abstract-Metaheuristic algorithms are investigated and used by many researchers in different areas. It is crucial to find optimal solutions for all problems under study especially for the ones which require sensitive optimization. Especially, for real case problems, solution quality and convergence speed of the algorithms are highly desired characteristics. In this paper, a new optimization algorithm called Core Levels Algorithm (COLA) based on the use of metaheuristics is proposed and analyzed. In the algorithm, two core levels are applied recursively to create new offsprings from the parent vectors which provides a desired balance on the exploration and exploitation characteristics. The algorithm's performance is first studied on some well-known benchmark functions and then compared with previously proposed efficient evolutionary algorithms. The experimental results showed that even at the early stages of optimization, obtained values are very close or exactly the same as the optimum values of the analyzed functions. Then, the performance of COLA is investigated on real case problems such as some selected microwave circuit designs. The results denoted that COLA produces stable results and provides high accuracy of optimization without high parameter dependency even for the real case problems.

show abstract

Section: Microwave Tapered Matching Circuit Designmentioning

confidence: 99%

Core Levels Algorithm for Optimization: Case of Microwave Models

Haydar¹,

Ülker²,

Dimililer³

et al. 2017

ijacsa

View full text Add to dashboard Cite

show abstract

“…Since ideal transmission lines can be used to model TEM transmission lines, the only non-trivial parts to be modelled are where discontinuities or gradual changes between different transmission line sizes or types occur in the physical structure of the combiner. Examples of some of these discontinuities and gradual changes and how they can be modelled can be found in [1,5,8,[14][15][16]. In most cases, some form of equivalent circuit model can be deduced or found in literature.…”

Section: Equivalent Circuit Model Descriptionmentioning

confidence: 99%

“…with all values listed in the same order as in (8), and dimensions given in mm. The input parameter vector x contains 13 parameters, and according to (5) the matrix G takes all of these parameters into account in the calculation of x p .…”

Section: Design Example: a Coaxial Combiner With Improved Bandwidthmentioning

confidence: 99%

“…Since the introduction of the modern personal computer and electromagnetic analysis software, the design of power combiners/dividers, especially axially symmetric types, has been facilitated by full-wave simulation [1][2][3][4][5][6][7][8][9]. However, the relatively high computational cost of full-wave simulations limits the amount of the parameter space that can be searched within a reasonable time and cost, thereby possibly limiting the performance that can be attained.…”

Section: Introductionmentioning

confidence: 99%

“…For example, circuit modelling can be used for parts of the device with known circuit models, and the rest modelled by full-wave simulation, as is done in [7,8]. This method reduces the size of the full-wave problem being solved, but it might not be straight-forward to divide the problem into appropriate parts, and full-wave parameter sweeps or optimization are still required to find optimal parameter values.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Axially Symmetric Power Combiners Using Surrogate Based Optimization

Beyers¹,

Villiers²

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

View full text Add to dashboard Cite

Abstract. The design and optimization of axially symmetric power combiners usually rely on computationally expensive full-wave simulations. Circuit models are often used to reduce the computational cost, however, full-wave parameter sweeps or optimization are usually still required. Surrogate based optimization utilizing circuit models offers an effective means to reduce the computational cost, since the circuit model can be aligned to the full-wave model, usually resulting in fewer full-wave simulations being required. This paper presents some of the recent advances in using Space Mapping, which is a surrogate based optimization technique, for the design and optimization of axially symmetric power combiners.

show abstract

Single section, octave bandwidth,high‐powercombiner in theUHFband

Naeimi

Ahmadi

2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

In this work, a planar broadband high-power combiner in the ultra-highfrequency band (UHF) is presented. The proposed broadband combiner is a modified version of the conventional Wilkinson power combiner. The isolation resistor of 100 Ω in the conventional Wilkinson combiner is replaced by two 50 Ω terminating resistors. Two overlay couplers transform the terminating resistors to a floating resistor between the input branches. Terminating resistors are preferred to a floating resistor because of higher power handling and lower parasitics. Even-and odd-mode method is employed for the analysis. The design goal is 20 dB isolation and ports return loss in an octave bandwidth. To verify the design concept, a high-power combiner in the frequency range of 470 to 860 MHz used for digital video broadcasting-terrestrial (DVB-T) applications is designed and constructed. Full-wave simulations are compared with measurements. The fabricated power combiner handles 400 W output power. Analytical formulations presented in this work are not restricted to UHF band and can be used to design an octave bandwidth combiner in other frequency bands.

show abstract

Design of Conical Transmission Line Power Combiners Using Tapered Line Matching Sections

Cited by 39 publications

References 7 publications

Core Levels Algorithm for Optimization: Case of Microwave Models

Core Levels Algorithm for Optimization: Case of Microwave Models

Design of Axially Symmetric Power Combiners Using Surrogate Based Optimization

Single section, octave bandwidth,high‐powercombiner in theUHFband

Contact Info

Product

Resources

About