Effect Of M And N Shaped Defects On A Rectangular Microstrip Patch Antenna
Résumé: The objective of this work is to study the effect of introducing N and M shaped defects on a Rectangular Microstrip Patch antenna (RMSPA). This is achieved by performing suitable modifications to an original basic antenna designed to radiate at 2.47 GHz (Bluetooth application) by introducing successively M, N and double N shaped defects. It has been found that significant size reduction can be accomplished with the obtained Defected Microstrip Structures (DMS). The introduced defects decrease significantly the structure resonant frequency denoting size reduction of 51.60%, 93.84 and 84.03 % for respectively M, N and double N shaped defects with respect to equivalent RMSPA operating at the new resonant frequencies. After that, a suitable size reduction performed to the double N shaped DMS allowed us to obtain a defected reduced size dual frequency MSPA operating at Bluetooth (2.47 GHz) and GSM (1.00 GHz). The proposed reduced size DMS achieves 22% and 87.53 % of size reduction compared respectively to the single-band RMSPA structures operating at these frequencies. The simulations which concern various antenna parameters such as return loss, input impedance, current distribution as well as radiation pattern have been carried out using the full-wave based on the methods of Moments Zeland IE3D software package.
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