Compact triband ACS-fed monopole antenna employing open-ended slots for WLAN/WiMAX applications

Abstract

Abstract-A compact triband asymmetric coplanar strip (ACS)-fed monopole antenna for WLAN/WiMAX applications is proposed and investigated in this paper. The proposed antenna is composed of an ACS-fed folded monopole and two inverted-L branches, which occupies a very compact size of 26.5 × 12 mm 2 including the ground plane. By carefully adjusting the lengths and positions of these branches, three desired resonant frequencies can be achieved and adjusted independently. The antenna exhibits three resonances covering the 2.4/5.8 GHz WLAN bands and 3.5 GHz WiMAX band. Details of the antenna design, simulation, and experimental results are presented and discussed. The proposed antenna shows nearly omnidirectional radiation characteristics and moderate gains in the operating bands. The compactness, simple feeding technique and uniplanar design make it easy to be integrated within the portable device for wireless communication.

DESIGN & DEVELOPMENT OF COMPACT UNIPLANAR SEMI-HEXAGONAL ACS FED MULTI-BAND ANTENNA FOR PORTABLE SYSTEM APPLICATION

“…A smart feeding configuration, ACS, which adopts the principle of Coplanar Waveguide (CPW) feeding has been recently described in [11][12][13][14][15][16][17][18][19][21][22][23][24]. These antennas are generally smaller than simple coplanar waveguide (CPW)-fed antenna.…”

“…For example, an antenna reported in [11] is a triband antenna with large size (299 mm 2 ) and does not cover 2.5/5.5 GHz WiMAX and 5.8 GHz WLAN application bands, Similarly, the antenna in [24] is large in size (318 mm 2 ) and does not support 5.2 GHz WLAN and 2.5 GHz LTE band. However, the printed antenna reported in [23] is relatively small, but it is not capable of covering 5.8 GHz WLAN and 5.5 GHz WiMAX bands. Hence, in this research, a dual wide band monopole antenna is presented.…”

Compact Tri-Band Planar Monopole Antenna With Acs-Fed Structure

“…Therefore, a considerable amount of research and approach have been devoted to achieve WLAN and WiMAX applications [1][2][3][4][5][6][7][8][9][10][11][12]. For example, a three strips monopole antenna [1], a L-slot antenna with a slit and a strip [2], a defected ground structure (DGS) antenna [3], a inverted-F antenna [4], and a printed omni-directional antenna [5].…”

“…However, the CPW-fed antenna occupies a large ground plane, which possibly limits the integration level of the future wireless communication system. In order to further minimize the overall size of antenna, the asymmetric coplanar strip (ACS)-fed structure is introduced and several ACS-fed antennas have been proposed [9][10][11][12] such as ACS-fed inverted-C-shaped monopole antenna [9], ACS-fed F-shaped antenna [10], ACS-fed open-ended slots antenna [11], and triband ACS-fed circulararc-shaped stepped monopole [12]. Compared with the CPW-fed antenna the ACS-fed antenna has more compact structure, wider impedance matching, better integration level and only has single lateral ground plane which means the overall size could be reduced to about one half.…”

“…The bandwidth over different frequency bands can be controlled independently by adjusting the geometries and the sizes of the monopole, the slot and the strip. Meanwhile, compared with the ACS-fed antennas mentioned above [9][10][11], the proposed antenna has one more operating band of WiMAX (3.5 GHz) and achieves much simpler structure. Furthermore, the processes of generating the operating bands are given in detail, the effects of the key parameters are also simulated and analyzed, and the experimental results are presented and discussed.…”