Abstract
Three types of Ultrawideband (UWB) antennas with single, double, and triple notched bands are proposed and investigated for UWB communication applications. The proposed antennas consist of CPW fed monopole with spiral slot etched on the patch. In this paper single, double, and also triple band notches with central frequency of 3.57, 5.12, and 8.21 GHz have been generated by varying the length of a single spiral slot. The proposed antenna is low-profile and of compact size. A stable gain is obtained throughout the operation band except the three notched frequencies. The antennas have omnidirectional and stable radiation patterns across all the relevant bands. Moreover, relatively consistent group delays across the UWB frequencies are noticed for the triple notched band antenna. A prototype of the UWB antenna with triple notched bands is fabricated and the measured results of the antenna are compared with the simulated results.
Highlights
In modern communication there has been increasing demand in designing Ultrawideband (UWB) systems [1]
The UWB radio system occupies UWB frequency band, that is, 3.1–10.6 GHz, approved by Federal Communications Commission (FCC) [2], in which there might potentially exist several narrow band interferences caused by other wireless communication systems, such as IEEE 802.11a wireless local area network (WLAN) in the frequency band of 5.15– 5.35 GHz and 5.725–5.825 GHz and WiMAX mainly around 3.5 GHz
The main objective of this paper is to present a simple and compact realization with stable radiation performance of a triple band-notched planar antenna suitable for UWB applications
Summary
In modern communication there has been increasing demand in designing Ultrawideband (UWB) systems [1]. In [23] three open ended quarter-wavelength slots are used to obtain band-notched characteristics at three frequencies 3.5, 5.5, and 7.5 GHz. The triple band-notched characteristic is obtained by etching a complementary meander line split ring resonator inside the radiation patch and ground plane of a rectangular antenna in [24]. The triple band-notched characteristics are achieved by embedding two different vertical up C-shaped slots with a vertical down C-shaped slot in the radiating patch and in the ground plane, respectively. The second section deals with the spiral slot with two turns to achieve double notch bands and in the last section it is described that the spiral slot with three turns etched on the patch is used to achieve triple notch bands. All of these antennas with multiple notched bands are fabricated and experimentally verified
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