Single-layer single-patch wideband microstrip antenna
TL;DR: In this article, a coaxially-fed single-layer single-patch wideband microstrip antenna in the form of a rectangular patch with a U-shaped slot is discussed, achieving 10-40% impedance bandwidth without the need of adding parasitic patches in another layer or in the same layer.
Abstract: A coaxially-fed single-layer single-patch wide-band microstrip antenna in the form of a rectangular patch with a U-shaped slot is discussed. Measurements showed that this antenna can attain 10-40% impedance bandwidth without the need of adding parasitic patches in another layer or in the same layer.<
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Citations
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Book•
30 Nov 1993
TL;DR: Details of Element Pattern and Mutual Impedance Effects for Phased Arrays and Special Array Feeds for Limited Field of View and Wideband Arrays are presented.
Abstract: Phased Arrays in Radar and Communication Systems. Pattern Characteristics and Synthesis of Linear and Planar Arrays. Patterns of Nonplanar Arrays. Elements, Transmission Lines, and Feed Architectures for Phased Arrays. Summary of Element Pattern and Mutual Impedance Effects. Array Error Effects. Special Array Feeds for Limited Field of View and Wideband Arrays.
2,233 citations
TL;DR: This paper presents a novel single-patch wide-band microstrip antenna: the E-shaped patch antenna, where two parallel slots are incorporated into the patch of a micro Strip antenna to expand it bandwidth.
Abstract: This paper presents a novel single-patch wide-band microstrip antenna: the E-shaped patch antenna. Two parallel slots are incorporated into the patch of a microstrip antenna to expand it bandwidth. The wide-band mechanism is explored by investigating the behavior of the currents on the patch. The slot length, width, and position are optimized to achieve a wide bandwidth. The validity of the design concept is demonstrated by two examples with 21.2% and 32.3% bandwidths. Finally, a 30.3% E-shaped patch antenna, resonating at wireless communication frequencies of 1.9 and 2.4 GHz, is designed, fabricated and measured. The radiation pattern and directivity are also presented.
989 citations
Cites background from "Single-layer single-patch wideband ..."
...In [ 6 ], the authors presented a U-slot microstrip antenna and demonstrated that its bandwidth could exceed 30%....
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Book•
24 Nov 2008TL;DR: In this paper, the FDTD method for periodic structure analysis is used for periodic structures analysis of EBG surfaces and low profile wire antennas are used for EBG surface wave antennas.
Abstract: Preface 1. Introduction 2. FDTD Method for periodic structure analysis 3. EBG Characterizations and classifications 4. Design and optimizations of EBG structures 5. Patch antennas with EBG structures 6. Low profile wire antennas on EBG surfaces 7. Surface wave antennas Appendix: EBG literature review.
634 citations
01 Oct 1997
TL;DR: In this paper, the U-slot patch on a foam substrate of about 0.08/spl lambda/thick was designed to attain 20-30% impedance as well as gain bandwidth.
Abstract: Experimental and simulation results are presented on the coaxially fed rectangular patch antenna with a U-shaped slot. Experimental results include impedance bandwidth, copolar- and crosspolar-pattern characteristics and gain measurements. Simulation results are obtained mainly through the development of a FDTD code. It is found that the U-slot patch on a foam substrate of about 0.08/spl lambda/ thick can be designed to attain 20-30% impedance as well as gain bandwidths without the need of parasitic patches on another layer or on the same layer. The far-field patterns have good copolar and crosspolar characteristics. By altering the patch width or feed position, the wideband characteristic can be changed into a dual-frequency characteristic. Simulation results are in good agreement with measurements.
413 citations
TL;DR: A new numerical stochastic optimization algorithm, inspired from colonizing weeds, is proposed for Electromagnetic applications, and invasive weed optimization (IWO) is described and applied to different electromagnetic problems.
Abstract: A new numerical stochastic optimization algorithm, inspired from colonizing weeds, is proposed for Electromagnetic applications. This algorithm, invasive weed optimization (IWO), is described and applied to different electromagnetic problems. The linear array antenna synthesis, the standard problem used by antenna engineers, is presented as an example for the application of the IWO. Compared to the PSO, The features of the IWO are shown. As another application, the design of aperiodic thinned array antennas by optimizing the number of elements and at the same time their positions is presented. By implementing this new scenario, thinned arrays with less number of elements and lower sidelobes, compared to the results achieved by genetic algorithm (GA) for the same aperture dimensions, are obtained. Finally, the IWO is applied to a U-slot patch antenna to have the desired dual-band characteristics.
335 citations
Cites methods from "Single-layer single-patch wideband ..."
...To demonstrate the applicability of the IWO in electromagnetics, the design of a U-slot patch antenna [31], [32] to have the desired dual-band characteristics is considered....
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References
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TL;DR: In this article, the characteristics of a two-layer electromagnetically coupled rectangular patch antenna were investigated for s between 0.31λ0 and 0.37λ0, and the variations of pattern shape, 3 dB beamwidth and impedance bandwidth with spacing s between the two layers were studied.
Abstract: Experimental results on the characteristics of a two-layer electromagnetically coupled rectangular patch antenna are presented. The variations of pattern shape, 3 dB beamwidth and impedance bandwidth with spacing s between the two layers are studied for s between 0 and 0.37λ0. A relatively high-gain region is found for s between 0.31λ0 and 0.37λ0.
325 citations
TL;DR: In this paper, a full-wave spectral domain analysis has been used to obtain input-impedance results for a probe-fed rectangular-patch antenna, modeling the source as a magnetic current frill.
Abstract: A full-wave spectral domain analysis has been used to obtain input-impedance results for a probe-fed rectangular-patch antenna, modeling the source as a magnetic-current frill. Multiple modes are used in the probe surface current to account for axial and azimuthal variations. It is established that maximum resistance is dependent on the substrate loss tangent. The axial variation of the probe current must be taken into account for substrate thicknesses greater than about 0.02 wavelengths.
56 citations
TL;DR: In this article, the spectral properties of coplanar microstrip parasitic subarrays were investigated by means of a spectral-domain full-wave analysis and the moment method analysis, and a comparison of the theoretical input impedance results obtained by the analysis of a three-element linear array showed a reasonable agreement between computed and measured R and X values.
Abstract: Basic characteristics of several configurations of coplanar microstrip parasitic subarrays consisting of one fed patch and two or more parasitic patches were investigated by means of a spectral-domain full-wave analysis and the moment method analysis. Results are presented for radiating- and nonradiating edge-coupled three-element linear subarrays and for a five-patch cross. A comparison of the theoretical input impedance results obtained by the analysis of a three-element linear array showed a reasonable agreement between computed and measured R and X values.
41 citations
01 Jan 1989
TL;DR: This chapter describes the multiport network approach, segmentation desegmentation techniques, and their applications to design of microstrip antennas and evaluation of multiport impedance matrices from the Green's functions for various types of segments.
Abstract: This chapter describes the multiport network approach, segmentation desegmentation techniques, and their applications to design of microstrip antennas. Relevant aspects of various models for microstrip antennas are presented. The multiport network model, which is an extension of the well known cavity model for microstrip patches, is discussed. Evaluation of multiport impedance matrices from the Green's functions for various types of segments is described. Modelling of external fields (including fringing, radiation and surface wave) by edge-admittance networks is detailed.
26 citations