Approximate model for microstrip fed slotantennas

Akhavan, Hamed; Mirshekar‐Syahkal, D.

doi:10.1049/el:19941300

Cited by 53 publications

(37 citation statements)

References 1 publication

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“…Fig. 5 shows an equivalent circuit model for the two-port device when the transition between microstrip and slot line is represented by an ideal transformer with a frequency dependent turn ratio ( ) [21], and the slot is modeled by a second order shunt resonant circuit near its resonance [22]. The radiation conductance , which is also referred to as the slot conductance, attains a low value that corresponds to a very high input impedance at the resonant frequency.…”

Section: Full-wave Simulation and Tuningmentioning

confidence: 99%

A novel approach for miniaturization of slot antennas

Azadegan

Sarabandi

2003

IEEE Trans. Antennas Propagat.

173

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Abstract-With the virtual enforcement of the required boundary condition (BC) at the end of a slot antenna, the area occupied by the resonant antenna can be reduced. To achieve the required virtual BC, the two short circuits at the end of the resonant slot are replaced by some reactive BC, including inductive or capacitive loadings. The application of these loads is shown to reduce the size of the resonant slot antenna for a given resonant frequency without imposing any stringent condition on the impedance matching of the antenna. In this paper, a procedure for designing this class of slot antennas for any arbitrary size is presented. The procedure is based on an equivalent circuit model for the antenna and its feed structure. The corresponding equivalent circuit parameters are extracted using a full-wave forward model in conjunction with a genetic algorithm optimizer. These parameters are employed to find a proper matching network so that a perfect match to a 50 line is obtained. For a prototype slot antenna with approximate dimensions of 0 05 0 0 05 0 the impedance match is obtained, with a fairly high gain of 3 dBi, for a very small ground plane ( 0 20 0 ). Since there are neither polarization nor mismatch losses, the antenna efficiency is limited only by the dielectric and Ohmic losses.

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Section: Full-wave Simulation and Tuningmentioning

confidence: 99%

A novel approach for miniaturization of slot antennas

Azadegan

Sarabandi

2003

IEEE Trans. Antennas Propagat.

173

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“…Rigorous equations to determine the probe equivalent circuit components using simplest uniform-current model were presented. Of crucial importance are (8)(9)(10)(11)(12), (24) and (27). The transformer ratio (1: R 0 ) is the junction between the radial and coaxial junction of the coaxial probe, which is useful in determining the input impedance in one line given certain termination conditions in others, impedance of which may be the same if the electrical dimensions are very small [9,10].…”

Section: Proposed Equivalent Circuit Modelmentioning

confidence: 99%

“…3. According to Akhavan et al [11]; the values of microstrip parallel lumped elements at antinodes can be computed following the below processes. First step is to determine the equivalent radiation conductance G rm expression given in (1) and reported in [10] …”

Section: Proposed Equivalent Circuit Modelmentioning

confidence: 99%

Equivalent circuit model of a coaxial excited microstrip‐fed quasi‐lumped element resonator antenna array

Olokede¹,

Adamariko²,

Qasaymeh³

2015

IET Microwaves, Antennas & Propagation

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An approximate lumped-parameter equivalent circuit model of the quasi-lumped element resonator antenna array is presented. The array consists of six series resonant circuits of frequency-independent elements, each with an interdigital finger capacitor (IDC), and shorted across by a parallel narrow strip inductor. Each resonator exhibits an aperture size of 0.207l g × 0.2l g at a centre frequency of 5.8 GHz, with entire array size of 2.857l g × 1.07l g . The resulting design is fed by a microstrip line and excited by a coaxial feed probe. A simple equivalent circuit model representing the six resonant circuits as well as the coaxial feed probe circuit, using the magnetic-frill model approach but with the simplest uniform-current model is described to predict the characteristics of the proposed resonator (and by extension, the proposed array), the effects of the coaxial probe and the microstrip feed line. Simulated data obtained from a full wave analysis using finite integration technique commercial solver is compared with the Agilent advanced design system results of the equivalent circuit. The derived equivalent circuit model was validated both analytically and by numerical simulations.

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“…At the antinodes points, the input impedance is high resistance, hence the line acts as a parallel resonant circuit. As in [31], the input admittance Y m is equal to G rm + jB m where G rm is the equivalent radiation conductance and B m is the susceptance of the fringing field capacitance of the microstrip. The expressions of G rm and B m are:…”

Section: Dimensions and Modeling Of Dra Arraymentioning

confidence: 99%

Novel Modeling and Design of Circularly Polarized Dielectric Resonator Antenna Array

Ain

Qasaymeh²,

Ahmad³

et al. 2012

PIER C

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Abstract-This paper presents a design of circularly polarized dielectric resonator antenna (DRA) array. The dielectric resonators (DRs) were excited by rectangular aperture coupling slots feed with a linear microstrip. The slot positions were determined based on the characteristic of standing wave ratio over a short ended microstrip to deliver the maximum amount of coupling power to the DRs, in order to improve the array gain Each DR element was rotated 45 • with respect to the sides of the exciting slot to generate circular polarization pattern. The DRA array was modeled and simulated as a parallel RLC input impedance component using Agilent (ADS) software, since that will ensure the resonant frequency of the antenna as primary design step before simulating in (CST) software and doing the measurements. The results of the return loss, gain radiation and pattern axial ratio are shown. The gain of the proposed array in X band was about 8.5 dBi, while the 3 dB axial ratio bandwidth started from 8.14 to 8.24 GHz. The impedance bandwidths started from 8.14 GHz to 8.26 GHz. The proposed DRA exhibited an enhancement of the gain in comparison to a single pellet DRA. The size of the whole antenna structure is about 40 mm × 50 mm and can potentially be used in wireless systems.

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Approximate model for microstrip fed slotantennas

Cited by 53 publications

References 1 publication

A novel approach for miniaturization of slot antennas

A novel approach for miniaturization of slot antennas

Equivalent circuit model of a coaxial excited microstrip‐fed quasi‐lumped element resonator antenna array

Novel Modeling and Design of Circularly Polarized Dielectric Resonator Antenna Array

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