A new compact dual-band, dual-polarized microstrip antenna is presented. This antenna resonates at two frequencies with different polarizations: a linearly polarized one for terrestrial communication, and a circularly polarized one for satellite mobile communication. This antenna also pro¨ides an area reduction of 70% compared to a standard rectangular patch antenna. ᮊ
frequency band used in many wireless communication applications, the patch size would be only 2 cm = 2 cm and 1.6 cm thick, which is small enough for many applications.The effects of the size and placement of the notches on the operation of the antenna were investigated next. The dimensions N, D, and D were varied, where N governs the 2 ABSTRACT: Dual-frequency operation is achie¨ed from a compact microstrip antenna by loading a pair of narrow slots close to its radiating edges. The two frequencies ha¨e parallel polarization planes and similar radiation characteristics. The ratio between the two operating frequencies ( ) can be tuned in the range 1.14᎐1.24 , which is much smaller than that of similar designs. The abo¨e excellent radiation characteristics are achie¨ed along with an area reduction of ;75% compared to the standard rectangular patch.
Design equations are presented for calculating the resonance frequencies for a compact dual frequency arrow-shaped microstrip antenna. This provides a fast and simple way to predict the resonant frequencies of the antenna. The antenna is also analyzed using the IE3D simulation package. The theoretical predictions are found to be very close to the IE3D results and thus establish the validity of the design formulae.
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.
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