Compact Multifrequency Slot Antenna Design Incorporating Embedded Arc-Strip

Abstract

A compact coplanar waveguide (CPW)-fed multifrequency circular slot antenna design loaded with arc-shaped metallic strips is investigated and verified in this letter. The proposed design implemented on a 0.8-mm FR-4 substrate shows that the arc-shaped metallic strips yield the multiple resonant modes for multiband vision. Unlike other multifrequency antennas whose sizes are determined by the lower resonant frequency, the compact size of the proposed slot is determined by the upper resonant frequency. Other operating frequencies are obtained by inserting arc-shaped metallic strips without increasing the overall antenna area. The prototype for different applications examined by modifying the angles of the arc-shaped metallic strips reveals that the input impedance bandwidths of the operating frequencies range from 5.0% to 64.7%. Moreover, these operating resonant bands exhibit the broadside radiation patterns with efficiency better than 45%.Index Terms-Multifrequency antennas, slot antennas.

A Compact Semi-Circular and Arc-Shaped Slot Antenna for Heterogeneous RF Front-Ends

“…Among the planar antenna structures, the slot antenna is one of the most promising candidates for multi-band antenna applications because, in addition to the aforementioned attractive qualities, they inherently possess larger bandwidths and occupy less space which makes them promising components for microwave applications [1][2][3][4][5][6][7][8][9][10]. In this frame, various designs of multi-band slot antennas have been proposed [11][12][13][14][15][16][17][18][19]. Moreover, several techniques have been proposed in the literature to enhance the parameters of conventional microstrip slot antennas and realize the multi-band function, these include using new feeding techniques [20], Defected Ground Structures (DGS) [10,[21][22][23], parasitic elements [24,25], Metamaterial [26,27], etc.…”

“…A compact CPW-fed triple-band antenna for diversity applications is reported in [30], triple-band antennas in [31,32] and quad-band in [33,34] and broad-band circular polarization [35], for example. The dual-band characteristic of these kind of antennas may be achieved by joining small resonant slots to the body of the main one [36] or etching several stubs on the large slots [14]. Slot antennas triple-band characteristic is also possible by etching three folded slots on the ground plane such as the designs reported in [15,16], or several stubs on the slots [17].…”