A compact monopole antenna for WLAN applications

Abstract

The design of a compact antenna for use in wireless devices of the 2.4/5.2/5.8‐GHz wireless‐local‐area network (WLAN) is presented. The antenna consists of an L‐shaped monopole radiator (L‐element) with microstrip‐fed on one side of the substrate and a protruding meander‐microstrip ground stub (M‐stub) on the other side. The L‐element and the M‐stub generate a high‐frequency band at around 5.4 GHz for the high WLAN bands and a low‐frequency band at around 2.44 GHz for the low WLAN band, respectively. The antenna has a very compact size of only 25 × 25mm2, including the ground plane. Computer simulation is used to study, design, and optimize the antenna. For verification of the simulated performance, the antenna is fabricated and measured using the antenna measurement system, Satimo Stargate. The effects of the feeding cable used in measurement cause discrepancies between the simulated and measured performances. To verify the cable effects, the feeding cable is modeled in simulation. With the use of the cable model, the simulated and measured performances show very good agreements. A practical application of the proposed antenna is also studied by installing it on a printed‐circuit board having the similar size of a smartphone. The impedance bandwidth, radiation pattern, peak gain, and efficiency of the antenna are studied and presented. Results show that the antenna is a potential candidate for small WLAN wireless devices. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:469–475, 2014

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].…”

“…Dual-band antenna in [21] with an average gain of 2.5 dB having dimensions 25 mm × 25 mm being compact in size operates only in WLAN band. Further, in some other designs, the antenna gains and reflection coefficient parameters are not impressive compared to the antenna dimensions [15][16][17][18][19][20][22][23][24][25]. In [26], a CPWfed multiband antenna having dimension 70.4 mm × 45 mm is implemented having an impedance bandwidth of 127 MHz for WiMAX band only.…”

A Dual-band Inverted F Antenna with L-slots for WLAN

“…Nowadays, WLAN (wireless local area network) has attracted attention as the technology that enables short-range wireless communications between different devices such as notebooks, printers, mobile phones and the internet [1][2][3]. Therefore, design of wider bandwidth WLAN antenna is very attractive.…”

“…Therefore, design of wider bandwidth WLAN antenna is very attractive. The Inverted F antenna is highly desirable for they can be manufactured at a much low cost than waveguide-based antenna technology and are considerably more compact and light-weight [3]. There exist many different kinds of antenna designs, such as planar inverted-F antenna, the planar monopole antennas and so on, which enable antennas with low-profile, light-weight, and single-feed to fit the limited equipment space of the WLAN devices [4].…”

“…In one of our previous work [3], a Inverted F antenna for 2.4GHz WLAN has been proposed. In this paper, the novel Inverted F antenna which frequency band is expanded by slot-loaded is introduced.…”