Resonance frequencies of compact microstrip antenna

Abstract

A simple technique for calculating the resonance frequencies of a compact arrow-shaped microstrip antenna is presented and discussed . The accuracy of the method is validated by experimental results. Introduction:The arrow shaped microstrip antenna, which produces dual frequency dual polarisation operation with considerall. 37 No. 19 1151 ble size reduction compared to conventional patches has been reported [ I]. These antennas provide greater area reduction and improved gain compared to drum shaped patches [2 ]. Prediction of the resonance frequency of drum shaped patches [3 ] and circular patches for broadband operation [4] are available in the literature. In this Letter , we propose empirical formulas for calculating the resonance frequencies of the arrow shaped microstrip antenna. These antennas can be employed for obtaining dual frequency with the same polarisation, bandwidth enhancement , circular polarisation etc. by varying its different parameters or by introducing slots. The proposed design equations provide an easier and simple way of predicting the resonant frequencies of these patches.Comparison of theory and experiment : The theoretical variation of the two resonant frequencies fio and jot with L for different values of Wcd and W, are given in Fig. 2. The experimental curves are also given to validate the computation . To further check the validity, the antennas were fabricated on substrates with different dielectric constants and thickness. The results are shown in Fig. 3. In all these cases the theoretical results are in good agreement with experimental values with maximum error < No.

Comparative Regression Analysis for Estimating Resonant Frequency of C-Like Patch Antennas

“…Such antennas are generally symmetrically loaded concerning the edge of the patch, while the slot antennas consist of asymmetric notches on one side of the patch. While symmetric antennas are easy to analyze, asymmetric slot antennas cannot be expressed in basic mathematical equations [10][11][12][13][14][15][16][17][18]. erefore, analysis of the C-like slot antenna is performed by choosing different feed types, feed point location, and dielectric materials in this study.…”

ANFIS model for determining resonant frequency of rectangular ring compact microstrip antennas

“…Lately, compact microstrip antennas (CMAs) obtained by applying some modification on the structure of the conventional microstrip antenna like slot-loading, shorting-pin/wall and bending on the patch and/or ground have been proposed to cope the limitations aforementioned [1][2][3]. Several slot loaded CMA configurations such as shapes of C [4][5][6], E [7,8], H [4][5][6][8][9][10], L [8], rectangular ring [4], circular ring [11], arrow [12] and horn [8] have been presented in the literature as an alternative and effectively way to reduce the antenna size physically by increasing the effective resonant length.…”

“…It is known that the determination of the resonant frequency plays a crucial role in the design of CMAs because of having too narrow bandwidth. The approximate resonant frequency formulas for C [4][5][6], H [4,6,9,10], circular ring [11] and arrow shaped [12] CMAs have been produced by deriving with the use of the simulations. The calculation of resonant frequency of E [7,8], H [8], L [8] and horn shaped [8] CMAs were achieved by converting the patch area of CMAs to an equivalent rectangular microstrip antenna (RMA) using the equivalent area method given in [7,8].…”