Applied Physics A (Impact Factor: 1.7). 06/2011; 103(3):805-808. DOI: 10.1007/s00339-011-6255-x
AMC and EBG behaviors are respectively characterized by reflection phase method and dispersion diagram. A fast and simple analytical model based on transmission line theory is proposed for each analysis. The validity of these analytical methods is verified by a comparison between circuit representations, measurements and numerical results.
[Show abstract][Hide abstract] ABSTRACT: Phased array antennas play a growing place in modern airborne systems because it offers radio electric performances and integration capacities which can't be considered with others technologies. These applications can be grouped within the same system including antenna arrays with scan angle over a large frequency spectrum. Nevertheless, important antenna performance limitations are due to mutual coupling between radiating elements and to limited space available for antenna integration into aircraft. These two limitations can be removed with High Impedance Surface. HIS behaves as an artificial magnetic conductor (AMC) and/or electromagnetic band gap material which exhibits forbidden electromagnetic band gap (EBG) for surface waves at certain frequency bandwidths. After a state of the art of artificial materials and their abilities to reduce mutual coupling in an array, we present and propose analytical and numerical methods, validated by measurements, to design AMC, EBG structures, and compact absorbing material. Then we study several configurations employing classical solutions and HIS solutions used as a filter to reduce mutual coupling between two microstrip antennas spaced by a half wavelength. Finally, we present an analytical method, validated by numerical simulations, for designing a self-complementary connected antenna array located above a high impedance ground plane. Employed as reflector, HIS can create several additional bandwidths, possibly agile in frequency, and then widening the initial bandwidth of the antenna array. Moreover HIS can be designed for reducing the total antenna thickness.
[Show abstract][Hide abstract] ABSTRACT: A flexible uniplanar Artificial Magnetic Conductor (AMC) design is presented. FEM simulations used to design and analyze the performance of the AMC structure are shown. Its performance under flat and bent conditions is characterized by means of reflection coefficient phase measurements of a manufactured prototype in an anechoic chamber. Broad AMC operation bandwidth and polarization angle independency is found for the prototype in both flat and bent situations. In addition, its angular margin under oblique incidence operation is also measured.
Antennas and Propagation (EUCAP), Proceedings of the 5th European Conference on; 05/2011
[Show abstract][Hide abstract] ABSTRACT: A novel flexible uniplanar AMC design is presented. An AMC prototype is manufactured using laser micromachining and it is characterized under flat and bent conditions by measuring its reflection coefficient phase in an anechoic chamber. The designed prototype shows broad AMC operation bandwidth (6.96% and higher) and polarization angle independency. Its angular stability margin, when operating under oblique incidence, is also tested obtaining
as limit for a 14.4 cm × 14.4 cm prototype.
International Journal of Antennas and Propagation 12/2012; 2012(4). DOI:10.1007/s00339-012-7373-9 · 0.66 Impact Factor
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