Design of Compact CPW‐FED Monopole Antenna for WLAN/WiMAX Applications Using a Pair of F‐Shaped Slits on the Patch

Abstract

back ratio larger than 3 dB and this value is sufficient for a GPR where the lack of any reflecting ceiling is assumed.In order to complete our experimental characterization and to catch a glimpse of the radiation pattern in the 3D space, we report also the measured diagrams in the yz plane. Figures 6(a) and 6(b) show the measured diagrams for frequencies above and below 800 MHz, respectively: as it can be expected from the knowledge of the radiation diagram of a bow-tie, there is no radiation along the y axis. We observe that in this plane the agreement between the experimental and numerical findings is exceptionally good for all the frequencies taken into account and the gain reaches its maxima around 195 and 295 . CONCLUSIONWe have proposed a planar bow-tie antenna with a structured ground plane whose radiative characteristics are well-suited for wide band pulsed radar working in the 500-1600-MHz band. The directivity is augmented by shaping the ground plane that acts as a reflector; the electronic RF front-end of the radar and the antenna can share the same ground plane and the bow-tie feeding based on a coplanar stripline makes our layout fully compatible with the differential output of a RF chip. Although the maximum gain of the prototype oscillates between about 2.5 and 1 dB in the 800-1600-MHz frequency range, the gain can be lower than 25 dB in the 500-800 MHz range, nevertheless, the antenna can be used over the whole proposed bandwidth thanks to the reflection coefficient below the 210-dB level which guarantees an acceptable working condition for the RF front-end. Obviously, among the major benefits of the proposed planar antenna, in comparison to other antennas used for through-wall and GPRs, there are its low cost and compatibility with mass production.ABSTRACT: In this article, a compact and small coplanar waveguide fed (CPW-fed) monopole antenna is proposed for wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. In the proposed antenna, the main target is to present a compact structure with a step-by-step design procedure on the patch. The antenna consists of a slotted rectangular patch as radiator, a partial CPW-ground plane. To excite WiMAX/WLAN bands, two Fshaped slits are inserted into the rectangular patch that resonates at the frequencies of 3.5 and 5.4 GHz. By suitable adjusting the lengths of the F-shaped design, much wider impedance bandwidth can be produced, especially at the lower band of WLAN/WiMAX. The size of the antenna is 15 3 15 3 1.6 mm 3 . A prototype of the designed antenna is constructed and experimentally investigated. The 210 dB S 11 bandwidths of them are (3.15-4.63 GHz) and (4.75-6.62 GHz), respectively, which can cover both the WLAN bands GHz) and the WiMAX bands (3.4-3.6 GHz and 5.25-5.85 GHz). Proper omnidirectional radiation pattern characteristics and enough gains are obtained over the operating bands.

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

“…Hence, to address these problems, researchers around the world focus on the design of electrically small multiband antennas with wide impedance bandwidth characteristics. Distinct shaped antennas with dual [1][2][3][4][5][6] and triple operating bands [7][8][9][10][11][12] with different substrates have been reported in the literature, which are fed by microstrip [4-6, 9, 10, 20] and coplanar waveguide (CPW) [1-3, 7, 8].…”

A Novel Dual Ultrawideband CPW‐Fed Printed Antenna for Internet of Things (IoT) Applications

“…Various CPW-fed antennas have been reported in literature such as multiband [3][4][5][6][7][8], CPW antennas with added strip for WLAN [9][10][11], and asymmetric coplanar strip antennas [12][13][14][15][16][17][18][19][20]. However, majority of these designs have large antenna dimensions and do not cover all the major bands of WLAN/WiMAX/LTE [13][14][15][16]18].…”

A compact double‐psi‐shaped dual band patch antenna for WLAN/LTE applications

“…Different designs for multiband antennas can be found in the literatures . Although these designs are shown to exhibit good radiation characteristics, the antenna structures are either complicated and, therefore, difficult to be fabricated or the designs take up unnecessary space, resulting in large sizes . In this article, we present the design of a novel compact dual band patch antenna.…”