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The main goal of this letter is to increase the impedance bandwidth of a hybrid bow-tie antenna with end-fire radiation pattern by combining with slots and a patch radiator. The proposed antenna simplify the structure of an antenna with the merits of light weight, low cost, ease fabrication for many wireless and mobile applications. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1905–1908, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24463

This presents a high-impedance ground plane (HIGP) structure for bow–tie antenna in order to improve its radiation performances. The HIGP is a kind of electromagnetic bandgap (EBG) structure to decrease surface waves and to bring an improvement of side lobe level, and reduce the mutual coupling between the two antennas. As compared to proposed antenna without HIGP, the measurement results show a fairly good antenna gain and a 5–10 dB reduction in the back lobes. Several properties of the proposed antenna for WLAN operation such as impedance bandwidth, radiation pattern, and measured gain have been investigated in detail, numerically and experimentally. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2928–2931, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23807

New design of a dipole antenna with rectangular fractal shape radiator element with two operating bands for radio frequency identification (RFID) is presented. By using fractal shape slot and metal meander patch, the proposed antenna has the wide and dual measured return loss bandwidth. Besides, the omnidirectional radiation pattern of the design antenna cover the entire frequency range including ultra high frequency (UHF, 860–960 MHz) band and microwave (2.45 GHz) band has been obtained. Several properties of the proposed antenna for dual-band operation such as impedance bandwidth, radiation pattern, and measured gain have been investigated numerically and experimentally in detail. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1963–1966, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23512

A new design of slot antenna by CPW-fed is proposed for ultrawideband (UWB) applications. The proposed antenna consists of a CPW-fed and a pair of symmetry curved radiating slot. The designed tapered slot antenna covers the bandwidth from 3 to 20 GHz. Simulated and measured results of the new design CPW-fed UWB slot antenna show fairly good performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 561–564, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22197

Study of CPW-fed monopole antenna with circular and rectangular fractal shape radiator element is proposed. By using fractal slot, new design antennas have the wide measured return loss bandwidth. In addition, the omnidirectional radiation patterns of the design antennas covering the entire frequency range have been obtained. Several properties of the antennas such as impedance bandwidth, radiation patterns, and gain have been investigated numerically and experimentally in detail. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1267–1272, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22448

A circularly polarized (CP) stacked antenna for the long range reader of a RFID is studied. The proposed CP antenna using stacked patch technique with a high-impedance ground plane exhibits fairly good performances of 30 MHz bandwidth for 3 dB axial ratio, 70 MHz bandwidth referred to 10 dB return loss at the center frequency of 915 MHz. The gain of the designed antenna is more than 7 dBi over 902–928 MHz and 922–928 MHz and the reading range of the reader reaches 5.5 m. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2248–2250, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23658

A novel and simple structure for a CPW-fed half-loop antenna is presented. The proposed antenna covered the ultra-wideband bandwidth (3.1–10.6 GHz) to even higher band (∼20 GHz) for VSWR

New design of a compact antenna with slotted structure for multioperating bands of wireless communication systems is presented. By using compact configuration and slot designs on printed circuit board, the proposed antenna has the multiband measured operations for covering the 2.4-GHz WLAN (2.4–2.484 GHz), the WiMAX (IEEE 802.16e in the Taiwan: 2.5–2.69/3.5–3.65 GHz), and the 5-GHz WLAN (5.15–5.35/5.725–5.825 GHz) bands. Several properties of the proposed compact antenna for multiband operation such as impedance bandwidth, radiation pattern, and measured gain have been numerically and experimentally investigated. © 2008 Wiley Periodcals, Inc. Microwave Opt Technol Lett 51: 502–503, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24094

Originally published Microwave Opt Technol Lett 50: 2928–2931, 2008. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2525, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24591