In this paper a novel triple band compact microstrip slot antenna is designed, utilizing fractal Koch shape based on metamaterial electric-LC element coupling load. The antenna is fed by CPW line, and it has triple band resonances operating at frequencies of about 1.5, 3.5 and 5.4 GHz for GPS, WiMAX and WLAN applications. The bandwidth of antenna at aforementioned frequencies is about 1.9%, 14% and 5% with the gains of −4.5, 3.75 and 5.3 dBi respectively. Also it has property of circular polarization for WiMAX application at 3.5 GHz. Furthermore metamaterial ELC element based on the metasurface theory, and making variation of the current distribution for circular polarization, made a compact small antenna at 1.5 GHz, where the antenna size is reduced to λ/5 × λ/5 through coupling on ELC element. The total size of the fractal antenna is assumed 40 × 40 mm, and is designed and fabricated on FR-4. The simulation results are extracted by HFSS commercial software, and compared with experimental results.

Compact microstrip fractal Koch slot antenna with ELC coupling load for triple band application

A novel compact microstrip planar slot antenna with triple-band operations for WALN and WiMAX applications is proposed. The antenna, which occupies an overall dimension of 35 £ 19 £ 1:6mm 3 , has a simple structure which consists of an asymmetric coplanar strip with a reverse G-shaped slot and a U- shaped open stub. The U-shaped open stub excites a resonant mode at 2.4GHz. On the other hand the asymmetric coplanar strip could excite the resonant modes at 5.2GHz. Meanwhile, the reverse G- shaped slot is aimed to excite resonant modes at 3.5 and 5.8GHz. It has good omnidirectional radiation patterns in the azimuth plane and reaches 1.1dBi at 2.4GHz, 2.3dBi at 3.5GHz, 3.1dBi at the band of 5GHz. The designed antenna is simulated by HFSS software and a good agreement with experimental results is demonstrated.

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Triple-Band Slot Antenna with U-Shaped Open Stub Fed by Asymmetric Coplanar Strip for WLAN/WiMAX Applications

In this paper, a simple microstrip antenna for the radio frequency identification (RFID) applications and wireless local area network (WLAN) is presented. The antenna has two operating bands at 2.45 and 5.8 GHz, which are reserved for RFID applications and WLAN applications. The studied antenna design, analysis and characterization have been performed using CST electromagnetic simulation software. The antenna was analyzed with FR4 substrate. Reflection coefficient, VSWR and directivity results were simulated, presented and discussed. The designed antenna was fabricated on ArlonAD320 dielectric with relative permittivity of 3.2. SMA female connector is used for feeding with characteristic impedance of 50 Ω. The measured reflection coefficient of the proposed antenna is compared with the simulated one, good agreement is observed. The proposed antenna is simple in design and compact in size, providing broadband impedance matching, consistent omnidirectional radiation patterns and appropriate gain characteristics (>1.5 dBi) in the RFID frequencies regions.

Rectangular Patch Antenna for Dual-Band RFID and WLAN Applications

In this paper, a novel triple-band monopole antenna with double coupled C-shaped strips for WLAN/WiMAX applications is presented. By adjusting the dimensions of the outer and inner C-shaped strips, three separated impedance bandwidths of 20% (2.28 ∼ 2.78 GHz), 14% (3.33 ∼ 3.83 GHz) and 19% (4.86 ∼ 5.86 GHz) can be obtained. Especially, the asymmetry inner C-shaped strip can be used to adjust the middle and high band characteristics. With these double coupled C-shaped strips, the proposed antenna shows a good triple-band property to satisfy the requirements of 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands.

A Novel Triple-Band Monopole Antenna with Double Coupled C-Shaped Strips for WLAN/WiMAX Applications

A small coplanar waveguide (CPW)-fed tri-band monopole antenna for the worldwide interoperability for microwave access (WiMAX) and wireless local area network (WLAN) applications is proposed. The antenna is simply composed of a T-shaped monopole, a L-shaped monopole and an inverted L-shaped stub extended from the ground. Experimental results show that the proposed antenna covers 2.5–2.71 GHz, 3.39–3.72 GHz and 5.14–5.87 GHz with 10 dB return loss, covering all the 2.5/3.5/5.5 GHz WiMAX bands and 5.2/5.8 GHz WLAN bands. Furthermore, the antenna has a simple planar structure and a small size of only 17.7 × 21.5 mm2, including the finite ground CPW feeding mechanism. Good dipole-like radiation characteristic is obtained over the operating bands.

Small Tri-Band Monopole Antenna for WiMAX/WLAN Applications

In this paper, a novel dual-band rectangular slot antenna for wireless local area network (WLAN) applications in IEEE 802.11b/g/a systems is presented. The proposed antenna, fed by a 50› microstrip line, has size of 32mm £ 28mm £ 1:6mm. By introducing a pair of U-shaped strips, the proposed antenna can generate two separate impedance bandwidths. The prototype of the proposed antenna has been successfully constructed and tested. The low-band resonant frequency is located at about 2.4GHz, with i10dB impedance bandwidth from about 2.3 to 2.5GHz. The high- band resonant frequency is located at about 5.7GHz, with i10dB impedance bandwidth from about 4.9 to 6.0GHz. In addition, the measured results show good radiation characteristics at the two operating bands, proving the dual-band operation of the proposed antenna.

https://www.jpier.org/pierl/pierl13/09.09111103.pdf

Chun-Yan Li

Papers

Design of a novel microstrip-fed dual-band slot antenna for wlan applications