Mode-matching design of substrate-integrated waveguide couplers

Kordiboroujeni, Zamzam; Børnemann, Jens; Sieverding, Thomas

doi:10.1109/apemc.2012.6237805

Cited by 25 publications

(20 citation statements)

References 24 publications

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“…This structure is analyzed with a mode-matching technique (MMT) [8] that uses a circular-to-square via conversion such that the square vias' side lengths are equal to the arithmetic mean of the side lengths of the inscribed and circumscribed squares of the circular via [9]. For details of this technique, the reader is referred to [8], [9], where the theory is fully described, including every formula required to perform the S-parameter calculations. In order to obtain the best value for , with and given, the input reflection coefficient of the transition is minimized by varying .…”

Section: Introductionmentioning

confidence: 99%

Designing the Width of Substrate Integrated Waveguide Structures

Kordiboroujeni

Børnemann

2013

IEEE Microw. Wireless Compon. Lett.

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116

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A new formula for the effective width design of substrate integrated waveguide (SIW) structures is presented. Contrary to another formulation of similar accuracy, which requires an iterative process or solution of a fifth-order polynomial, the new equation allows the direct design of the SIW's width for a given cutoff frequency. The presented formula is obtained by minimizing the reflections from the junction between the SIW and an all-dielectric waveguide of equivalent width. A mode-matching approach is used to derive the equation which is verified by comparison with WaveWizard for three SIW examples. Further optimizations in CST Microwave Studio and WaveWizard demonstrate the robustness of the new formula. Index Terms-Design equation, effective waveguide width, mode-matching techniques (MMTs), substrate integrated waveguide (SIW).

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Section: Introductionmentioning

confidence: 99%

Designing the Width of Substrate Integrated Waveguide Structures

Kordiboroujeni

Børnemann

2013

IEEE Microw. Wireless Compon. Lett.

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116

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“…There are other methods which are not based on neural networks for modeling microwave components such as Krylov method [25], finite element [26], mode-matching method [27], vector-fitting method, and so forth [28]. In the preceding section, we present vector-fitting method.…”

Section: Other Methods In Microwave Modelingmentioning

confidence: 99%

Modeling and Simulation Techniques for Microwave Components

Mohammadi¹,

Sadrossadat²

2017

Microwave Systems and Applications

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This chapter discusses about methods used in simulation and modeling of radio frequency (RF)/microwave circuits and components. The main topic that is discussed here is about one of the most powerful methods, that is, artificial neural networks. In this chapter, different types of neural network such as dynamic and recurrent neural networks will be discussed. Other techniques that are popular in the area of microwave components simulation and modeling are numerical techniques such as vector fitting, Krylov method, and Pade approximation. At the end of the chapter, vector fitting as an example of numerical methods will be discussed.Keywords: artificial neural networks, circuit simulation and modeling, transient analysis, function approximation, RF/microwave circuits IntroductionIn recent years, ascending development of wireless communication products and huge trend for commercial market in this ground caused significant improvement in modeling and simulation approaches of radio frequency (RF) and microwave circuits. Such high-frequency circuits are leading to the development of a large variety of microwave models for passive and active devices and circuit components [1]. Modeling and computer-aided design (CAD) methods have an essential role in microwave designs and simulations [2]. The older approaches were mainly based on slow trial-and-error processes and an emphasis on performance at any price, but today seems to be a new era in high-frequency circuit design and modeling, since development in this ground has enabled microwave engineers to design larger, more efficient, and more complicated circuits than before [1,3]. This complexity requires new materials and technologies that require not only new models but also new © 2017 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.algorithms in computer-aided design [4] for RF/microwave circuits, antennas, and systems to keep up with the advancement of technology with emphasis on time-to-market and low-cost approaches [1,3]. In addition to accurate parametric-modeling techniques to describe the behavior of the microwave device, a reliable description that explains the changes of its behavior against geometrical or physical parameters is also needed [5].Also, since circuit models at high frequencies often lack fidelity, detailed electromagnetic (EM) simulation techniques are needed to improve design accuracy. Although EM simulation techniques are heavily used yet, they are computationally expensive, so there is a demand for design methodologies to be not only accurate but also fast. Another concerning problem today is optimization. To meet this purpose, computer-based algorithms that work with iterative circuit evaluation are needed; this process also needs a highly repetitive computational process. Another concerning issue a...

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“…The SIW coupler used for this application is a variation of the one presented in [11]. In the design process, the coupler can be first designed in all-dielectric waveguide technology where the cutoff frequency f c specifies the equivalent waveguide width W equi…”

Section: A Coupler Designmentioning

confidence: 99%

K-band substrate integrated waveguide variable phase shifter

Mamedes

Esmaeili

Børnemann

2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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A substrate integrated waveguide (SIW) variable phase shifter for K-band applications is presented that can be straightforwardly integrated with other SIW antenna feed circuitry. Biasing of two varactor diodes provides continuous control of the phase shift. The results demonstrate that the proposed structure has a wide phase tuning range, flat insertion loss and low reflection coefficient over a wide frequency band. Experimental results confirm that the phase can be shifted by up to 200 degrees at one frequency and by about 140 degrees for the rest of the band. Insertion losses are measured at 4 dB, and the return loss is better than 10 dB.Index Terms-phase shifter, substrate integrated waveguide, feed network, varactor diode.I.

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Mode-matching design of substrate-integrated waveguide couplers

Cited by 25 publications

References 24 publications

Designing the Width of Substrate Integrated Waveguide Structures

Designing the Width of Substrate Integrated Waveguide Structures

Modeling and Simulation Techniques for Microwave Components

K-band substrate integrated waveguide variable phase shifter

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