Reflective array antenna

About: Reflective array antenna is a research topic. Over the lifetime, 4366 publications have been published within this topic receiving 57884 citations.

SoftWear Antenna

Abstract: SoftWear antenna is a new concept of describing soft wearable antennas that take the advantage of flexible materials making the whole antenna structure flexible. This paper describes how the performance of wearable textile antennas is affected on the antenna bending. Here, we will focus on the resonance frequency fluctuation and input-match bandwidth variation due to the antenna bending as well as the effects of radiation pattern deformation and radiation efficiency. The results are given for three different antennas, namely, a conventional patch, EBG (electromagnetic band-gap), and dual-band U-slot antennas.

New antenna layout for a SuperDARN HF radar

Abstract: [1] A new antenna layout for a Super Dual Auroral Radar Network (SuperDARN) HF radar has been developed. The new layout utilizes two auxiliary arrays; one behind and one in front of the main array, rather than the single auxiliary array that existing radars use. The rear auxiliary array consists of three antennas providing beam-steering capability while the front auxiliary array consists of a single antenna. This layout is expected to greatly improve the calculation of elevation angle of arrival. Simulations presented show the advantages and disadvantages of using twin-terminated folded dipole (TTFD) antennas and log-periodic dipole arrays in standard and modified SuperDARN array configurations. TTFD antennas are shown to have superior front-to-back ratio and beam-steering capability but suffer from shadowing effects due to the presence of corner reflectors. Impedance-matching techniques used in SuperDARN radars are discussed, and the results of a new matching method, exhibiting a superior voltage standing-wave ratio over the SuperDARN frequency band, are presented. Shadowing of the main array by the front auxiliary array is investigated, and it is shown that the impact of the front array on the main array gain pattern is significantly less for the case of a single front antenna than for a four-antenna front array. Radar phase calibration techniques are discussed, and it is proposed that the additional single-antenna front array be used for system-wide radar phase calibration. An algorithm for the determination of elevation angle of arrival using the new layout is also given.

Survey of design techniques for flat profile microwave antennas and arrays

Abstract: The increasing compactness of modern microwave communication and radar equipment commonly demands that the associated antennas have flat profiles; this paper surveys the various planar antenna design techniques that are available. After summarizing the well-established methods using slotted waveguide arrays, the more recent stripline and cavity backed printed antennas are surveyed; finally the latest techniques using microstrip arrays are introduced and state-of-the-art designs discussed. Outline design and explanatory details are given for each antenna and any special characteristics, advantages and disadvantages are noted; ample references are given throughout the text. Several conclusions are reached about ways of improving the various individual designs but the need to improve the control of both mechanical and electrical tolerances and also more accurately predict the sidelobe behaviour of arrays are seen as important general requirements for further research.

Microstrip phased-array antennas : a finite-array approach

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Design and simulation of planar Minkowski fractal antennas

Abstract: This paper describes the design and simulation of novel microwave patch type Minkowski planar fractal antennas using IE3D electromagnetic simulation software. The fractal structure is advantageous in generating multiple resonances or enhancing bandwidth. Fractal antenna is comprised of elements patterned after self-similar designs. Self-similarity of the fractal shape can be translated into its electromagnetic behavior. Fractal antennas are very old in concept and very new in design for broadband applications. Many discontinuities in the structure aid in radiating higher frequencies. Both miniaturization and broadband coverage are the greatly achievable factors in this type. This paper proposes the design and simulation of four stages of antennas and the performance characteristics of these four antennas have been reported in this paper.