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ABSTRACT This article describes a novel aperture-coupled feed, for the excitation of a cavity-backed quad-slot antenna with circular polarization. Firstly, a quad-slot cavity-backed antenna with linear polarization (LP) is proposed. Then, a novel aperture-coupled feed, which is composed of a cross-shaped coupling aperture and a T-shaped feeding microstrip line, will be applied to this LP antenna. By differing the lengths of the four radiation slots together with the novel aperture-coupled feed, 90° phase difference and equal magnitude between the radiations from the two pairs of slots can be generated. As a result, a good performance of axial ratio will be achieved for the proposed antenna. A prototype is fabricated at Ka band for a demonstration. Investigations show that the antenna can present a minimum axial ratio (AR) of only about 0.37 dB, as well as a fractional AR bandwidth of about 0.94%. A relative high gain of 6.9 dBic at 32.1 GHz is also achieved for the prototype. The proposed substrate integrated cavity backed antenna with circularly polarization has great potential to be integrated into millimeter-wave transceiver modules. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:588-594, 2016. [ABSTRACT FROM AUTHOR]

A wideband circularly polarised slot antenna is presented. The slot antenna is fed by four microstrip line feeds orientated to have relative phases of 0°, 90°, 180° and 270° using a feed network comprising a pair of broadband 90° hybrid. The proposed antenna delivers measured and simulated impedance bandwidths of 77.8% (1.02–2.32 GHz) and 89.1% (1.02–2.66 GHz), respectively, for standing wave ratio (SWR)<2, measured and simulated axial-ratio bandwidths of 88.9% (1–2.6 GHz) and 81% (1.1–2.6 GHz), respectively, for axial ratio < 3 dB and measured and simulated gain bandwidths of 33% (1.5–2.1 GHz) and 27% (1.6–2.1 GHz), respectively, for gain >3 dB. A good agreement is observed between simulation and measurement. [ABSTRACT FROM AUTHOR]

A compact dual-band printed wire antenna for applications in wireless communications is presented. An additional shorted parasitic element to the F-shaped wire antenna is introduced to achieve a dual-band operation. As an example, a new antenna was designed and fabricated for wireless local area network applications that operate in the 2.4 and 5.2/5.8 GHz bands. The prototyped antenna offered two separate measured impedance bandwidths of 700 (2.35–3.05 GHz) and 2150 MHz (3.95–6.1 GHz), for a return loss less than -10 dB. A measured antenna gain of 1.78–1.9 dBi was observed across the lower band, whereas a measured antenna gain of 3.9–4.4 dBi was observed across the upper band. The measured radiation patterns were stable across the passband. [ABSTRACT FROM AUTHOR]

A new balanced planar ultra-wideband (UWB) antenna is proposed. First, a novel uniplanar broadband balun transition is presented. Then, a balanced UWB planar dipole antenna fed by the proposed balun is studied, and has a measured bandwidth from 2.8 to 11.2 GHz for the return loss better than -10 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 114–118, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22040 [ABSTRACT FROM AUTHOR]

Experimental results for an L-probe-fed shorted triangular patch antenna are presented. Using a foam layer of thickness ∼0.13λ0 as a supported substrate, an impedance bandwidth of 61% (SWR≤2) and a gain of over 4.0 dBi in the bandwidth have been obtained. The far-field patterns are stable across the passband. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 218–220, 2001. [ABSTRACT FROM AUTHOR]

A broadband quarter-wavelength patch antenna with a U-slot is presented. Using a foam layer of thickness ∼0.07λ0 as a supported substrate, an impedance bandwidth of 27% (SWR≤2) has been obtained. The far-field patterns are stable across the passband. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 328–330, 2001. [ABSTRACT FROM AUTHOR]

Experimental results for an L-probe-fed shorted semicircular patch antenna are presented. Using a foam layer thickness ∼0.12λ0 as a supported substrate, an impedance bandwidth of 57% (SWR≤2) and a gain of over 4.0 dBi in the majority of the wide bandwidth have been obtained. The far-field patterns are stable across the passband. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 289–290, 2001. [ABSTRACT FROM AUTHOR]