Progress In Electromagnetics Research, Vol. 104, 1-13, 2010.

DOI: 10.2528/PIER10040507

In recent years, Ultra-Wideband (UWB) technology has gained significant attention due to its potential to revolutionize the way we communicate and interact with devices. One of the key components in UWB systems is the antenna, which plays a crucial role in transmitting and receiving UWB signals. Among various types of antennas, circular slot antennas have been widely studied for their compact size, easy fabrication, and good performance.

In this article, we present a novel UWB circular slot antenna provided with an inverted-L notch filter to operate at the 5 GHz WLAN band. The proposed antenna is designed to have a wideband impedance matching characteristic from 3.1 to 10.6 GHz, while the inverted-L notch filter is used to reject interference signals in the frequency range of 4.2 to 4.9 GHz.

The design process of the antenna is described in detail, including the selection of the slot width and length, as well as the optimization of the antenna's shape and size. The simulated and measured results show that the proposed antenna has a good radiation pattern and a high gain of around 3 dBi at 5 GHz. Additionally, the antenna's notch filter performance is also evaluated, demonstrating its effectiveness in rejecting interference signals.

This work provides valuable insights into the design and development of UWB circular slot antennas with notch filters for wireless communication systems. The proposed antenna can be used as a promising candidate for future UWB applications.

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Keywords: Ultra-Wideband (UWB), Circular Slot Antenna, Notch Filter, WLAN, Radiation Pattern, Gain.