A Broadband Proximity-Coupled Stacked Microstrip Antenna With Cavity-Backed Configuration
ABSTRACT A broadband cavity-backed proximity-coupled stacked microstrip antenna is presented. Due to the interaction of the two stacked patches, two associated resonances are produced. Unlike conventional proximity-coupled or cavity-backed microstrip antennas, the lower patch and the cavity of this antenna produce the coupled resonances. These devised methods make the antenna act as multiple resonances, conducing to a broadband impedance matching. The simulated and the measured results demonstrate a bandwidth over one octave (VSWR <; 2). In the meantime, stable radiation patterns are obtained across the entire impedance band. The key parameters of the antenna are studied, and a prototype antenna that has a three-dimensional interconnection structure is provided.
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ABSTRACT: A semi-circle-fed microstrip patch antenna is presented in this paper. The proposed antenna is found to have a much broader impedance bandwidth when compared with the conventional L-slot antenna. The proposed antenna is able to achieve an impedance bandwidth of 63.7% for Voltage standing wave ratio (VSWR)<2, centred at sime6 GHz. To the author's knowledge, this reported bandwidth is by far the largest achievable through the probe proximity coupled technique. A comparison between rectangular-shaped patch antenna and stub patch antenna using the same excitation mechanism is givenIET Microwaves Antennas & Propagation 07/2007; · 0.84 Impact Factor
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ABSTRACT: In this paper, the performance of stacked patches incorporating a high and low dielectric constant material combination is presented. Such a printed antenna is applicable for cases where photonic and microwave devices need to be directly integrated with the antenna. It is shown that 10-dB return-loss bandwidths in excess of 25% can be achieved with such a configuration. Importantly, the surface wave efficiency across this band of frequencies is high-greater than 85%. It is also shown that these stacked patches have lower cross-polarization levels compared to a conventional stacked patch and, thus, are very suited to circular polarization applications. Two circular polarization (CP) configurations are presented and experimentally verified. The single- and dual-feed configurations have 3-dB axial ratio bandwidths of 18% and 32%, respectivelyIEEE Transactions on Antennas and Propagation 01/2000; · 2.33 Impact Factor
Conference Proceeding: Further investigations into edge-fed cavity backed patches[show abstract] [hide abstract]
ABSTRACT: In this paper we experimentally verify the proposed technique. A prototype based on the simulations presented in [W.S.T. Rowe and R.B. Waterhouse, 2006] was fabricated and the return loss and radiation performance was measured. We also fabricated a base-line case, namely, a conventional edge-fed patch on the same thickness dielectric substrate and measured its performance. It was found that the new cavity backed edge-fed radiator improves the gain by 3 dB and reduces the pattern undulation by 10 dB. In this paper we also present some theoretical results of applying a variation of the cavity backed procedure to radiators that can be directly integrated with monolithic microwave integrated circuit (MMIC) and opto-electronic integrated circuit (OEIC) materials [W.S.T. Rowe and R.B. Waterhouse, 2003]. The new configuration potentially overcomes the trade-offs associated with trying to develop patch-based radiators on very thin, high dielectric constant material.Antennas and Propagation Society International Symposium, 2007 IEEE; 07/2007