Abstract
A promising internal issued slot antenna is one of the most favored antenna structures for low cost and compact design for wireless communication systems. In this work, we offer a design of compact small-size microstrip antennas with defected ground structure (DGS) appropriate for Global System for Mobile Communication (GSM) in the 1.8 GHz band operations. The suggested antenna is evaluated using High-Frequency Structure Simulator (HFSS) software with an average size of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{30 \times 13\times 0.8}$</tex> mm3. The antenna characteristics such as the return loss, gain, VSWR, radiation pattern, and radiation efficiency are talked over. The proposed antenna operates at1.8 GHz with a directivity of3.80 dB, a gain of about 4dB, and an efficiency of 63%.
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