scholarly journals Resonant Frequency of Tunable Microstrip Ring Antenna Printed on Isotropic or Uniaxially Anisotropic Substrate

2013 ◽  
Vol 2 (2) ◽  
pp. 6 ◽  
Author(s):  
S. Bedra ◽  
S. Benkouda ◽  
M. Amir ◽  
T. Fortaki
Keyword(s):  
Resonant Frequency ◽  
Microstrip Antenna ◽  
Air Gap ◽  
Cavity Model ◽  
Microstrip Resonator ◽  
Higher Order Modes ◽  
Anisotropic Substrate ◽  
Ring Antenna ◽  
Microstrip Ring ◽  
Good Agreement

In this study, the resonant frequency of annular ring microstrip resonator with uniaxial anisotropic substrate and air gap layer is analyzed. The cavity model for simple ring microstrip antenna is extended with some modifications for the tunable geometry taking into account the anisotropy in the layer. The theoretical resonant frequency results are in very good agreement with the experimental results reported elsewhere. The air gap tuning effect on the resonant characteristics is also investigated for fundamental and higher order modes.

Analysis of a circular microstrip antenna on isotropic or uniaxially anisotropic substrate using neurospectral approach

2013 ◽  
Vol 33 (1/2) ◽  
pp. 567-580 ◽  
Author(s):  
Sami Bedra ◽  
Siham Benkouda ◽  
Tarek Fortaki
Keyword(s):  
Resonant Frequency ◽  
Quality Factor ◽  
Microstrip Antenna ◽  
Numerical Results ◽  
Spectral Domain ◽  
Quality Factors ◽  
Resonant Frequencies ◽  
Content Type ◽  
Anisotropic Substrate ◽  
Circular Microstrip Antenna

Purpose – The paper aims to propose an artificial neural network (ANN) in conjunction with spectral domain formulation for fast and accurate determination of the resonant frequency and quality factor of circular microstrip antenna printed on isotropic or anisotropic substrate. This neurospectral approach reduces the problem complexity. Design/methodology/approach – The moment method implemented in the spectral domain provides good accuracy but its computational cost is high due to the evaluation of the slowly decaying integrals and the iterative nature of the solution process. The paper introduces the electromagnetic knowledge combined with ANN in the analysis of circular microstrip antenna on isotropic or uniaxially anisotropic substrate to reduce the complexity of the spectral approach and to minimize the CPU time necessary to obtain the numerical results. Findings – The resonant frequency results obtained from the neural model are in very good agreement with the experimental and theoretical results available in the literature. Finally, numerical results for the substrate anisotropy effect on the resonant frequency, quality factor and radiation pattern are also presented. Originality/value – The paper develops fast and accurate model based on ANN technique to calculate the resonant frequencies and quality factors of circular microstrip antennas. ANN is used to model the relationship between the parameters of the microstrip antenna and the resonant frequencies and quality factors obtained from the spectral domain approach. This relatively simple model allows designers to predict accurately the resonant frequencies and quality factors for a given design without having to develop or run the spectral method codes themselves. The main advantages of the method are: less computing time than the spectral model, results with accuracy equivalent to that of full-wave models and cost effectiveness, since the client can use a simple PC for implementation. Another advantage of the proposed ANN model is that it takes into account the uniaxial anisotropy in the substrate without increasing the network size. This is done by combining ANN with electromagnetic knowledge.

Design of a Miniaturization Microstrip Antenna and Cavity Model Analysis

2013 ◽  
Vol 340 ◽  
pp. 427-430
Author(s):  
Yun Xing Yang ◽  
Hui Chang Zhao ◽  
Si Chen ◽  
Yong Chen
Keyword(s):  
Resonant Frequency ◽  
Microstrip Antenna ◽  
Bessel Functions ◽  
Simple Structure ◽  
Engineering Application ◽  
Model Analysis ◽  
Cavity Model ◽  
Theory Analysis ◽  
Magnetic Wall ◽  
Circular Microstrip Antenna

On the demand of miniaturization of antenna, this paper presents a circular microstrip antenna whose part of its port is sealed. Changing part of its magnetic wall into electric wall, then a decimals mode which exist between andis proposed. Elaborating the theory of reducing the resonant frequency with Bessel functions characteristics and resonance formula of circular microstrip antenna. Using the HFSS for simulation, the resonant frequency of the antenna change from 3.0 GHz to 1.2 GHz. The results prove the reliability of theory analysis. The size could be reduced nearly 60% compared with ordinary antenna. The antenna has a simple structure and can be applied to engineering application.

Theoretical investigation of an air gap tuned superconducting triangular microstrip antenna

2013 ◽  
Vol 5 (5) ◽  
pp. 611-619 ◽  
Author(s):  
Ouarda Barkat
Keyword(s):  
Microstrip Antenna ◽  
Ground Plane ◽  
Air Gap ◽  
Effect Of Temperature ◽  
Resonant Frequencies ◽  
Full Wave ◽  
Triangular Patch ◽  
Improved Model ◽  
Equilateral Triangular Microstrip Antenna ◽  
Good Agreement

An analytical model is presented to improve the performance of the equilateral triangular microstrip antenna (ETMA). An improved model is presented taking into account the insertion of an air gap between the substrate and the ground plane, and High Tc superconducting material (HTS) for the triangular patch. The full-wave spectral domain technique in conjunction with the complex resistive boundary condition is used to calculate the characteristics including resonant frequencies, bandwidths, and radiation efficiency. Numerical results for the air gap tuning effect on the operating frequency and bandwidth of the high Tc superconducting triangular microstrip antenna (HTSTMA) are presented. The effect of temperature on resonant frequency and bandwidth of the HTSTMA are also given. The computed data are found to be in good agreement with results obtained using other methods.

scholarly journals Resonant Frequency of Circular Sectorial Microstrip Antenna Printed On Double-Layered Anisotropic Substrates

2021 ◽  
Author(s):  
Souad FRIHA ◽  
Sami Bedra ◽  
Fouad CHEBBARA ◽  
Randa BEDRA ◽  
Siham BENKOUDA
Keyword(s):  
Resonant Frequency ◽  
Computer Aided Design ◽  
Microstrip Antenna ◽  
Microstrip Antennas ◽  
Resonant Frequencies ◽  
Design Engineers ◽  
Anisotropic Substrates ◽  
Aided Design ◽  
Composite Substrates ◽  
Good Agreement

Abstract In this work, modal characteristics have been rigorously studied which germinate an improved, accurate, and efficient computer-aided design (CAD) formulation to estimate the resonant frequency of sectorial circular microstrip antennas printed on anisotropic suspended and composite substrates. The obtained results demonstrated that the resonant frequencies of the sectorial circular microstrip patch on suspended and composite substrates can be adjusted to obtain the maximum operating frequency of the antenna. The computed results show a fairly good agreement with measured results. Such theoretical validation and results may prove to be more useful for design engineers and further investigation.

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