Topic
Patch antenna
About: Patch antenna is a research topic. Over the lifetime, 35129 publications have been published within this topic receiving 446073 citations. The topic is also known as: Microstrip antenna.
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Book•
01 Jan 1981
TL;DR: This book discusses techniques and design limitations in two-dimensional arrays of flat-plate antennas, some manufacturing and operational problems of microstrip antennas, and other trends and possible future developments.
Abstract: * Chapter 1: Flat-plate antenna techniques and constraints on performance * Chapter 2: Microstrip design equations and data * Chapter 3: Radiation mechanism of an open-circuit microstrip termination - fundamental design implications * Chapter 4: Basic methods of calculation and design of patch antennas * Chapter 5: Linear array techniques * Chapter 6: Techniques and design limitations in two-dimensional arrays * Chapter 7: Circular polarisation techniques * Chapter 8: Some manufacturing and operational problems of microstrip antennas * Chapter 9: Recent advances in microstrip antenna analysis * Chapter 10: Other trends and possible future developments
598 citations
TL;DR: In this paper, a dual-band double-T monopole antenna is proposed for WLAN operation in the 2.4 and 5.2 GHz bands, which consists of two stacked T-shaped monopoles of different sizes, which generate two separate resonant modes for the desired dualband operation.
Abstract: A novel and simple printed dual-band double-T monopole antenna is proposed. The antenna comprises two stacked T-shaped monopoles of different sizes, which generate two separate resonant modes for the desired dual-band operation. The proposed antenna has a low profile and can easily be fed by using a 50 /spl Omega/ microstrip line. Prototypes of the proposed antenna designed for WLAN operations in the 2.4 and 5.2 GHz bands have been constructed and tested. Good radiation characteristics of the proposed antenna have been obtained. Effects of varying the monopole dimensions and the ground-plane size on the antenna performance have also been studied.
596 citations
TL;DR: In this paper, a method for the analysis of slot-type discontinuities in microstripline was proposed based on the reciprocity theorem and the exact Green's functions for the grounded dielectric slab in a moment method solution for the unknown antenna currents.
Abstract: A method is presented for the analysis of slot-type discontinuities in microstripline. The approach is based on the reciprocity theorem and uses the exact Green's functions for the grounded dielectric slab in a moment method solution for the unknown antenna currents. The method is applied to two specific geometries: a radiating slot in the ground plane of a microstripline, and an aperture coupled microstrip patch antenna. Results for antenna impedance are compared with measurements, and far-zone patterns are calculated. The method is shown to be quite versatile, and should find application to related problems.
557 citations
01 May 1979
TL;DR: In this article, an improvement to a recently reported theory for the analysis of the pattern and impedance loci of microstrip antennas is developed, which yields a theory which is simple and inexpensive to apply.
Abstract: : An improvement to a recently reported theory for the analysis of the pattern and impedance loci of microstrip antennas is developed. It yields a theory which is simple and inexpensive to apply. The fields in the interior of the antennnas are characterized in terms of a discrete set of modes. The poles corresponding to these modes are complex and depend on the losses in the antenna. The representation of the fields in terms of these modes in rigorous only for a bona fide cavity with no copper loss. The proper shift in the complex poles due to the addition of copper and radiative losses is approximated by lumping the latter two together with the dielectric loss to form an effective loss tangent. By so doing, it is found that the resulting expressions for impedance of the microstrip antenna is in good agreement with measured results for all modes and feed locations. The theory is applied to the evaluation of impedance variation with feed location, multiport analysis, and to design of circularly polarized microstrip antennas. (Author)
556 citations
TL;DR: In this article, a rotational element was used to achieve cophasal far-field radiation for a circularly polarized microstrip reflectarray with elements having variable rotation angles, which is the largest reflectarray ever developed using microstrip patches.
Abstract: This paper demonstrates a novel means of achieving cophasal far-field radiation for a circularly polarized microstrip reflectarray with elements having variable rotation angles. Two Ka-band half-meter microstrip reflectarrays have been fabricated and tested. Both are believed to be the electrically largest reflectarrays ever developed using microstrip patches. One, a conventional design, has identical square patches with variable-length microstrip phase-delay lines attached. The other has identical square patches with identical microstrip phase-delay lines but different element rotation angles. Both antennas demonstrated excellent performance with more than 55% aperture efficiencies, but the one with variable rotation angles resulted in better overall performance. A brief mathematical analysis is presented to validate this "rotational element" approach. With this approach, a means of scanning the main beam of the reflectarray over a wide angular region without any RF beamformer by using miniature or micromachined motors is viable.
554 citations