In this paper, a probe-fed rectangular ring with a cross-strip for wireless local-area network system is proposed. The antenna is analyzed by using the three-dimensional finite-difference time-domain method. The effects of various parameters on the characteristics of the antenna are studied. The computed and measured results for the return loss and co-and crosspolarization patterns are presented and compared. A prototype antenna operating at 2.44 GHz shows an impedance bandwidth (2:1 VSWR) of 13.06% and a gain of 9.5 dBi. Good radiation characteristics, including a cross-polarization level in both E-and H-planes greater than 26 dB and a front-to-back ratio (F/B) of radiation pattern greater than 16 dB, have been obtained.Index Terms-Bandwidth enhancement, cross-strip, finite-difference time-domain (FDTD) method, low cross-polarization, ring antenna, unidirectional antenna, wireless local-area network (WLAN).
This paper presents a dual-band printed dipole antenna for unidirectional radiation. The antenna is designed for the Wireless Local Area Network (WLAN) system that operating on both the frequency ranges of 2.400 – 2.483 GHz and 5.15 – 5.85 GHz. Radiated elements of the antenna are flat conductors on the surface of FR4 printed circuit board. All elements are on the same side of FR4. Coaxial line is chosen for feeding. It makes the antenna good matching and easy to assembly. The antenna is simulated by computer program before fabricating a prototype. It provides omni-directional radiation but has a direction with the gain about 5 dBi at the central of both operating frequencies. It is appropriate for the system that desired the signal to radiate surround but has some direction together. The size of the antenna is 44.0 × 60.0 mm2. Advantages of the antenna are low profile structure, light weight, and can be fabricated with cheap material. So, it is a low-cost antenna.
This paper presents a flat monopole over rectangle box ground plane. The monopole element is contributed from copper that coated on surface of the FR4 and rectangle box ground plane is contributed from brass sheets. The antenna provides the frequency range of 1.4-3.4 GHz with the return loss <-15 dB and average gain of 5.5 dBi. The HPBW is 108 degrees in the horizontal plane and 88 degrees in the vertical plane at the central band. The front-to-back ratios are greater than 8 dB across operating band with the ground plane of 80 mm x 50 mm and height of 35 mm. The antenna is suitable to use as a base station antenna.
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