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A novel radio frequency identification (RFID) tag antenna design mounted on metallic plane is presented in this article. The tag antenna structure is a rectangular radiating plate with a Z-shaped slot, which behaves like a half-wavelength slot resonator and a dipole-type ground radiator. For a conjugate match to the Alien Higgs-3 chip impedance of 8-j142 Ω at 925 MHz is obtained by etched a half-wavelength...
An UHF RFID tag antenna which is comprised of a U-shaped tuning stub and a dipole radiator for different permittivity surfaces is investigated, fabricated and measured. For a conjugate match to the NXP G2XM chip impedance of 29-j137 at 915 MHz, a dipole tag antenna (91 mm × 10 mm) with U-shaped stub connected to dipole arms was designed. Simple size adjustments of the U-shaped tuning stub and dipole...
The design of a novel open slot monopole antenna with a coupling element for WiMAX 3.5 GHz is proposed. The characteristics of the proposed antenna were mainly manipulated by the geometry of the open slot and coupling elements. The end coupling effect of the coupling elements can be easily tuned for impedance matching and resonant frequency. The novel antenna is a quarter-wavelength resonant structure...
A novel single-layer, microstrip-to- slotline transition technique for coupling a circularly polarized annular-ring slot antenna in the UHF band is presented. In the proposed design, circular polarization is generated using a proper asymmetry within the annular-ring slot structure and feeding the annular-ring slot using a slotline feed at 135?? from the asymmetry. The direct slotline feed is used...
A simple design of a wideband slot antenna with back-strip is presented. The proposed antenna is constructed by a CPW capacitively coupled annular-ring slot antenna and a back-strip. The dimensions of the slot and the back-strip decide the two resonant frequencies of the proposed antenna, respectively. Results show that the impedance bandwidth of the proposed wideband annular-ring slot antenna is...
In this paper, we present a novel high-gain wide-band dipole antenna for application in a wireless local-area network (WLAN) access point in the 5-GHz band. With proper dimensions chosen for microstrip-line, the proposed antenna can have an enhanced antenna-gain level over a large operating bandwidth covering the 5.2/5.8-GHz bands. This enhanced-gain characteristic is very attractive for practical...
Designs of coplanar waveguide (CPW)-fed equilateral triangular-ring slot antennas with tuning-stub are proposed and experimentally investigated. The impedance matching of the resonant frequency can be obtained only by adjusting the tuning-stub length for the proposed triangular-ring slot antenna with tuning-stub. Details of the proposed designs are investigated by experimental as well as theoretical...
In CPW-fed slot-coupled microstrip antennas, several shapes of the excitation slot have already been proposed in the open literature: inductively coupled slot, capacitively coupled slot and coupled slot-loop. Among these coupling mechanisms, the impedance matching of the inductively coupled and slot-loop coupled antennas are much more sensitive to the slot dimension. Thus, these cases of antennas...
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