Input impedance of probe-fed rectangular microstrip antennas with variable air gap and varying aspect ratio

2009 ◽  
Vol 3 (8) ◽  
pp. 1151 ◽  
Author(s):  
S. Chattopadhyay ◽  
M. Biswas ◽  
J.Y. Siddiqui ◽  
D. Guha
Keyword(s):  
Aspect Ratio ◽  
Input Impedance ◽  
Microstrip Antennas ◽  
Air Gap

INPUT IMPEDANCE OF RECTANGULAR MICROSTRIP ANTENNAS ON NON-RADIATING EDGES FOR DIFFERENT FEED SIZES

2008 ◽  
Vol 1 ◽  
pp. 191-198 ◽  
Author(s):  
Durbadal Mandal ◽  
Rajib Sri Kar ◽  
Anup Kumar Bhattacharjee
Keyword(s):  
Input Impedance ◽  
Microstrip Antennas

Miniaturization of Printed Microstrip Antennas Array by Using Defected Ground Structure Technique

2019 ◽  
pp. 101-146
Author(s):  
Otman Oulhaj ◽  
Amar Touhami Naima ◽  
Aghoutante Mohamed
Keyword(s):  
Computer Simulation ◽  
Radiation Pattern ◽  
Pattern Matching ◽  
Input Impedance ◽  
Microstrip Antennas ◽  
Design System ◽  
Theoretical Studies ◽  
Defected Ground Structure ◽  
Planar Antennas ◽  
Miniature Antennas

In this chapter, the authors present different techniques used to miniature microstrip antennas, particularly planar antennas array, for different applications demanding small dimensions. This will cover DGS, slot technique, and metamaterials. After the presentation of these techniques based on theoretical studies, the second part of this chapter will be about the authors' contribution in the miniaturization of microstrip antennas arrays. This part will include the presentation of some miniature antennas array which they have validated into simulation and measurement by using DGS techniques. The different structures were validated into simulation by using tow electromagnetic solvers ADS (advanced design system) and CST-MW (computer simulation technology) which permit one to validate and to verify the different performances of antennas arrays as radiation pattern, matching input impedance and small dimensions.

Erratum: Input impedance of rectangular microstrip antennas

1989 ◽  
Vol 136 (3) ◽  
pp. 279
Author(s):  
A.K. Bhattacharjee ◽  
S.R. Bhadra Chaudhuri ◽  
A. Mukherjee ◽  
D.R. Poddar ◽  
S.K. Chowdhury
Keyword(s):  
Input Impedance ◽  
Microstrip Antennas

scholarly journals Design Studies of Ultra-Wideband Microstrip Antennas with a Small Capacitive Feed

2007 ◽  
Vol 2007 ◽  
pp. 1-8 ◽  
Author(s):  
Veeresh G. Kasabegoudar ◽  
Dibyant S. Upadhyay ◽  
K. J. Vinoy
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Microstrip Antennas ◽  
Design Criterion ◽  
Air Gap ◽  
Ultra Wideband ◽  
Design Parameters ◽  
Impedance Bandwidth ◽  
Rectangular Patch ◽  
Almost All

The design of an ultra-wideband microstrip patch antenna with a small coplanar capacitive feed strip is presented. The proposed rectangular patch antenna provides an impedance bandwidth of nearly 50%, and has stable radiation patterns for almost all frequencies in the operational band. Results presented here show that such wide bandwidths are also possible for triangular and semiellipse geometries with a similar feed arrangement. The proposed feed is a very small strip placed very close to the radiator on a substrate above the ground plane. Shape of the feed strip can also be different, so long as the area is not changed. Experimental results agree with the simulated results. Effects of key design parameters such as the air gap between the substrate and the ground plane, the distance between radiator patch and feed strip, and the dimensions of the feed strip on the input characteristics of the antenna have been investigated and discussed. As demonstrated here, the proposed antenna can be redesigned for any frequency in the L-, S-, C-, or X-band. A design criterion for the air gap has been empirically obtained to enable maximum antenna bandwidth for all these operational frequencies.

scholarly journals ANN Synthesis Model of Single-Feed Corner-Truncated Circularly Polarized Microstrip Antenna with an Air Gap for Wideband Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zhongbao Wang ◽  
Shaojun Fang
Keyword(s):  
Computer Aided Design ◽  
Microstrip Antenna ◽  
Microstrip Antennas ◽  
Air Gap ◽  
Training Data ◽  
Data Sets ◽  
Circularly Polarized ◽  
Artificial Neural Network Ann ◽  
Aided Design ◽  
Lm Algorithm

A computer-aided design model based on the artificial neural network (ANN) is proposed to directly obtain patch physical dimensions of the single-feed corner-truncated circularly polarized microstrip antenna (CPMA) with an air gap for wideband applications. To take account of the effect of the air gap, an equivalent relative permittivity is introduced and adopted to calculate the resonant frequency andQ-factor of square microstrip antennas for obtaining the training data sets. ANN architectures using multilayered perceptrons (MLPs) and radial basis function networks (RBFNs) are compared. Also, six learning algorithms are used to train the MLPs for comparison. It is found that MLPs trained with the Levenberg-Marquardt (LM) algorithm are better than RBFNs for the synthesis of the CPMA. An accurate model is achieved by using an MLP with three hidden layers. The model is validated by the electromagnetic simulation and measurements. It is enormously useful to antenna engineers for facilitating the design of the single-feed CPMA with an air gap.

Sign in / Sign up

Export Citation Format

Share Document