This paper, published in the *Journal of Microwaves, Optoelectronics and Electromagnetic Applications* (Vol. 7, No. 2, December 2008), presents the design and analysis of a square patch antenna with two triangular notches on opposite edges. It compares the performance of this modified antenna with that of a regular square patch antenna. The research emphasizes that the notched antenna, designed on a glass epoxy FR4 substrate, exhibits dual-band operation and a higher bandwidth than a standard square patch antenna.

Key findings include:

1. Resonance Frequencies : The antenna resonates at two distinct frequencies within the 3.25-3.85 GHz band, which is designated for WiMAX systems by the IEEE 802.16 working group.

2. Bandwidth Improvement : The bandwidth increases to 9.1% with equal notch angles of 168°, compared to 2.09% for a normal square patch antenna.

3. Performance Metrics : The antenna's gain was measured at 3 dBi at 3.29 GHz, though this gain is relatively low due to the high dielectric constant and loss tangent of the FR4 substrate. Despite this, the radiation patterns and efficiency were deemed satisfactory, especially for WiMAX applications.

The paper highlights the potential for further optimization of the antenna's performance by exploring modifications such as air gaps or parasitic patches. The findings contribute to the development of compact, dual-band antennas for modern communication systems such as WiFi and WiMAX.