An Omnidirectional Triple-Band Circular Patch Antenna Based on Open Elliptical-Ring Slots and the Shorting Vias

Abstract

Abstract-A circular patch antenna based on open elliptical-ring slots and shorting vias with conical radiation patterns is proposed. Fed by the coaxial probe at the center of the circular patch, the proposed antenna is excited at three resonant modes, simultaneously. The first resonant mode (monopolar patch mode) is achieved by six shorting vias, each of which is placed at the center of the open elliptical-ring slot. By embedding six open elliptical-ring slots on the patch, the other two resonant modes of the open elliptical-ring slot resonator, TE 110 and TE 210 , can also be excited. Due to symmetrical slots on the patch, these two modes can produce conical patterns, and their frequency ratio can also be tuned by adjusting the size of the slots. The proposed antenna is fabricated and measured. The measured results show that the proposed antenna can provide three operating bands which meet the required bandwidth specifications of 2.4/5.8 GHz WLAN and 3.5/5.5 GHz WiMAX standards. Detailed design considerations of the proposed antenna are described, and both the simulated and measured results are given. Moreover, the effects of the vital parameters on the performance of the proposed antenna are analyzed in this paper.

Split quadrilateral multiband microstrip patch antenna design for modern communication system

“…It is well known that any slot has its complementary form in wires or strips, thus, patterns and impedances data of these forms can be used to predict the patterns and impedances of corresponding slots. 15 The geometry and layout of the proposed split quadrilateral-shaped MPA are highlighted in Figure 1 and Table 1 showing the summary. This antenna consists of three layers: they are patch, substrate, and ground and all the measurements are carried out in millimeter scale.…”

Wideband Omnidirectional and Sector Coverage Antenna Arrays for Base Stations

“…Moreover, the small size of mobile devices restricts the size of the antenna as well. Various examples of compact antennas with omnidirectional radiation characteristics and operating in a wide frequency range can be found in literature [1][2][3][4][5][6]. The antennas on mobile devices are generally low gain antennas due to restrictions on their size and radiation characteristics.…”

A Compact Low-Profile and Quad-Band Antenna With Three Different Shaped Slots

“…In the past years, some printed microstrip multiband antennas [1][2][3][4][5][6][7][8][9][10][11][12] have been designed. In [2], a compact quad-band microstrip antenna with two rectangular notches on the radiation patch is proposed and analysed for S-band and C-band applications.…”

“…For example, a band-notched UWB microstrip antenna is proposed with an S-shaped slot in the radiation patch and a pair of symmetrical C-shaped slots on the ground plane [5]. In [7], a circular patch antenna based on six open elliptical-ring slots on the radiation patch and shorting vias with conical radiation patterns is proposed. A coplanar waveguide (CPW)-fed planar monopole antenna with triple-band operation for WiMAX and WLAN applications is presented [9], where two bent slots with different sizes on the radiation patch are employed.…”