Journal ArticleDOI
Realisable rational function approximations for the equivalent circuit modelling of broadband antennas
Youngwook Kim,Hao Ling +1 more
TLDR
In this paper, the vector fitting (VF) algorithm is applied to the equivalent circuit modelling of an antenna over a broad frequency band to ensure that the resulting circuit model is realizable, the passivity constraint must be imposed during the modelling process.Abstract:
The vector fitting (VF) algorithm is applied to the equivalent circuit modelling of an antenna over a broad frequency band. To ensure that the resulting circuit model is realisable, the passivity constraint must be imposed during the modelling process. Three methods are investigated to ensure the passivity, each based on VF: (i) the use of quadratic programming proposed earlier by Gustavsen and Semlyen, (ii) a technique based on constraining a second-order rational function and (iii) a search method using a particle swarm optimisation with constraints. These techniques are evaluated through three sample antennas: a commercial broadband horn, an ultra-wideband planar monopole with a notch-band and an active integrated microstrip antenna. The results are compared in terms of the modelling error against the model order and the computation time required.read more
Citations
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Journal ArticleDOI
Improved Wheeler Cap Method Based on an Equivalent High-Order Circuit Model
TL;DR: An improved Wheeler cap method based on the equivalent high-order circuit model including transformers to provide accurate radiation efficiency, although the AUT does not operate as a simple resonance circuit.
Journal ArticleDOI
Modelling of a paraboloid antenna for receiving and its equivalent circuit
Xiang Gao,Zhengwei Du +1 more
TL;DR: In this article, a SPICE model of a paraboloid antenna for receiving is presented, which is converted from a receiving model based on the Thevenin's theorem and the reciprocity theory through rational approximation.
Journal ArticleDOI
Circuit Modelling of Broadband Antenna Using Vector Fitting and Foster Form Approaches for IoT Applications
Fatima Ez-Zaki,Khaoula Ait Belaid,Sarosh Ahmad,Hassan Belahrach,Abdelilah Ghammaz,Ahmed Al-Gburi,Naser Ojaroudi Parachin +6 more
TL;DR: In this article , the authors provide a comprehensive study of broadband antenna equivalent circuit models over broad frequency ranges for Internet of Things (IoT) applications using multiple approaches, including a Foster approximation, which is based on the antenna-simulated scattering parameters and impedance data.
Proceedings ArticleDOI
On equivalent circuit representations for radiating systems by means of complex-valued network elements
TL;DR: In this paper, it is shown that the essential steps which lead from electric field integral equations to equivalent circuit representations for radiating systems are similar, but differences exist in the spatial integration procedures which allow to reduce the relevant field problem to a network problem, leading to equivalent circuits representations which consist of either infinite ladder networks with lumped elements or per-unit length network parameters.
Proceedings ArticleDOI
Equivalent Circuit Model of a High Q Tunable PIFA
TL;DR: This paper presents an Equivalent Circuit Model (ECM) for a high Quality factor (Q) tunable Planar Inverted F Antenna (PIFA) that is valid when the PIFA is made tunable with an additional capacitor.
References
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Journal ArticleDOI
Rational approximation of frequency domain responses by vector fitting
Bjorn Gustavsen,Adam Semlyen +1 more
TL;DR: The paper describes a general methodology for the fitting of measured or calculated frequency domain responses with rational function approximations by replacing a set of starting poles with an improved set of poles via a scaling procedure.
Journal ArticleDOI
Enforcing Passivity for Admittance Matrices Approximated by Rational Functions
Bjorn Gustavsen,Adam Semlyen +1 more
TL;DR: In this paper, a linear power system component can be included in a transient simulation as a terminal equivalent by approximating its admittance matrix Y by rational functions in the frequency domain.
Proceedings ArticleDOI
Particle swarm, genetic algorithm, and their hybrids: optimization of a profiled corrugated horn antenna
TL;DR: The foundations and performance of the two algorithms when applied to the design of a profiled corrugated horn antenna are investigated and the possibility of hybridizing the twogorithms is investigated.
Journal ArticleDOI
Application of the Cauchy method for extrapolating/interpolating narrowband system responses
TL;DR: In this paper, the authors used Cauchy's method to interpolate/extrapolate narrow-band system responses, assuming that the parameter to be extrapolated/interpolated, as a function of frequency, is a ratio of two polynomials.
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Equivalent Circuit Modeling of Broadband Antennas using Vector Fitting and Particle Swarm Optimization
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