Immitance data modelling via linear interpolation techniques: A classical circuit theory approach

Yarman, Binboğa Sıddık; Kilinç, Ali; Aksen, Ahmet

doi:10.1002/cta.295

Cited by 31 publications

(28 citation statements)

References 22 publications

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“…The determination of circuit values is empirical-based, since equivalents are evaluated based on the data aggregated from simulations. Even though, some circuit optimization methods are proposed, e.g., in [23,24], the comprehensive method to estimate the initial values for the circuit evaluation has not been provided, according to the best knowledge of authors. Since the single-resonant dipoles are designed to operate at their lowest resonant frequencies, higher-order resonant modes are ignored in equivalents [25].…”

Section: Equivalent Circuits For Single-and Multi-resonant Dipole Antmentioning

confidence: 99%

Impedance Dependency on Planar Broadband Dipole Dimensions: An Examination With Antenna Equivalent Circuits

Tuovinen¹,

Berg²

2014

PIER

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Abstract-The present paper considers the connection between complex input impedance and the physical dimensions for planar ultra wideband (UWB) antennas. The first time the effect of both the actual radiator width and length for impedance behaviour is comprehensively presented. Also the effect of feed point dimensions on complex impedance is studied. The investigations involve both UWB single-resonant dipoles to cover bandwidth ≥ 500 MHz and a multi-resonant dipole for the entire Federal Communications Commission's (FCC) frequency band of 3.1-10.6 GHz. Lumped-element equivalent circuits are used identically with 3D antenna simulations in order to observe the corresponding impedance behaviour with the studied antennas. The used equivalent circuits consisting of seriesand parallel-resonant stages are widely accepted in the open literature. The series-resonant circuit of equivalent is observed to have the analogue to the antenna feeding area. The physical dipole dimensions in terms of a length and width are connected to parallel-resonant part, which mainly determines the antenna input impedance. The resistance of a parallel-resonant stage behaves as the maximum value of real part of dipole impedance with an influence on bandwidth together with the ratio of parallel capacitance C and inductance L. The increase of the antenna physical width has an effect on bandwidth, because of the wider the antenna, the higher the capacitance in the antenna feed. Since the traditional dipoles are used for these studies, the results can be extended in several ways for other antenna types or, for instance, to verify the effect of body tissue, close to a wearable antenna.

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Section: Equivalent Circuits For Single-and Multi-resonant Dipole Antmentioning

confidence: 99%

Impedance Dependency on Planar Broadband Dipole Dimensions: An Examination With Antenna Equivalent Circuits

Tuovinen¹,

Berg²

2014

PIER

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“…So in this case the stable factorization problem is to find a solution (g 0 , g 1 , g 2 , g 3 , g 4 , g 5 ) of the quadratic system (8) in which each g i > 0, and in addition the constraints…”

Section: The Main Quadratic Systemmentioning

confidence: 99%

“…In [8], the data given for a monopole antenna is modeled using the linear interpolation technique proposed for positive real functions. We used this problem for the experimental evaluation of A1 and A2.…”

Section: Algorithmic Approaches To Finding G(x)mentioning

confidence: 99%

“…In the design of microwave matching networks, amplifiers or in modeling passive one port devices such as antennas, lossless two ports are either described in terms of driving point immitance or reflectance functions [6,7]. The methods known as Real Frequency Techniques (RFT) are excellent tools for design and modeling [5,8]. Once the independent descriptive parameters are selected, numerical implementations of real frequency techniques demands the construction of strictly Hurwitz polynomials.…”

Section: Introductionmentioning

confidence: 99%

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Stable Factorization of Strictly Hurwitz Polynomials

Eğecioǧlu

Yarman

2010

INT J COMPUT COMMUN

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We propose a stable factorization procedure to generate a strictly Hurwitz polynomial from a given strictly positive even polynomial. This problem typically arises in applications involving real frequency techniques. The proposed method does not require any root finding algorithm. Rather, the factorization process is directly carried out to find the solution of a set of quadratic equations in multiple variables employing Newton's method. The selection of the starting point for the iterations is not arbitrary, and involves interrelations among the coefficients of the set of solution polynomials differing only in the signs of their roots. It is hoped that this factorization technique will provide a motivation to perform the factorization of two-variable positive function to generate scattering Hurwitz polynomials in two variables for which root finding methods are not applicable.

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“…In general, wideband equivalent circuits of microstrip antennas are determined by using optimization techniques [11][12][13][14]. In case of the equivalent circuit that models double resonant microstrip antennas, Kajfez devised a systematic approach to calculate the starting values of the involving optimization [11].…”

Section: Introductionmentioning

confidence: 99%

An Approach to Equivalent Circuit Modeling of Rectangular Microstrip Antennas

Ansarizadeh¹,

Ghorbani²,

Abd-Alhameed³

2008

PIER B

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Abstract-Computation of the broadband matching potential of a microstrip antenna requires the wideband lumped equivalent circuit of the antenna. The general topology of the equivalent circuit of rectangular microstrip patch antennas has been used to model the feedpoint impedance of microstrip antennas over a wide frequency band and equivalent circuit parameters are determined using optimization techniques. The proposed procedure overcomes the problems of physical realizability of the equivalent circuit and estimation of the starting values of the optimization. Applying this technique, wideband lumped equivalent circuits of a rectangular and E-shaped microstrip antenna have been computed which are in good agreement with measurement data from 0.1 to 6 GHz.

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Immitance data modelling via linear interpolation techniques: A classical circuit theory approach

Cited by 31 publications

References 22 publications

Impedance Dependency on Planar Broadband Dipole Dimensions: An Examination With Antenna Equivalent Circuits

Impedance Dependency on Planar Broadband Dipole Dimensions: An Examination With Antenna Equivalent Circuits

Stable Factorization of Strictly Hurwitz Polynomials

An Approach to Equivalent Circuit Modeling of Rectangular Microstrip Antennas

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