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.

Focused Microstrip Array Antenna Using a Dolph-Chebyshev Near-Field Design

Abstract: A new concept in designing large array antennas to focus the microwave power in the radiation near-field region is presented A small focused array antenna using microstrip patch elements to achieve the desired sidelobes levels in the Fresnel region based on Dolph-Chebyshev design is implemented This array is built to verify the concept, and then the measured and computed near fields are compared to verify the accuracy of the design Larger arrays are designed by using the knowledge of the mutual admittances between the elements of smaller arrays Several computed examples are presented in order to show some properties of focusing arrays It is shown that the maximum intensity of the electric field along the axial direction is displaced from the focal point towards the antenna aperture This displacement decreases as the aperture size increases

Ring array antenna with optimized beamformer for Simultaneous Transmit And Receive

Abstract: In order to avoid self-interference, Simultaneous Transmit And Receive (STAR) systems require low mutual coupling between their respective transmit and receive antennas. This paper discusses the development of an 8-element transmit ring array antenna on a circular ground plane with a raised receive element. When combined with a beamformer that supplies linear progressive phase shifts to the array with opposing elements phased 180-degrees apart, the receive and transmit antennas are measured to exhibit 55 dB of isolation and omni-directional patterns in the 2.4 to 2.5 GHz band.

Automatic Design of CP-RLSA Antennas

Abstract: In this paper a procedure is presented, allowing the automatic design of circular polarized radial line slot antennas, with either pencil or shaped beam patterns. The antenna slot layout is refined by an optimization scheme based on the physical picture behind the working mechanism of the array. The validity of the approach has been proved by designing very efficient pencil beam antennas, either with maximum directivity or with controlled side lobe levels, and a shaped isoflux beam antenna.

RF energy harvesting with multiple antennas in the same space

Abstract: It is highly desirable to increase the amount of energy derived from a given space by an energy-harvesting device. In this paper, multiple energy-harvesting antennas in essentially one space or area are proposed and experimentally studied as a means to increase the energy or power/area ratio. Four cooperating antennas are proposed in a square area that is less than twice the area required for a single antenna. The results obtained suggest that this can be a very promising method for energy harvesting.

Dual-Band Wide-Angle Scanning Planar Phased Array in X/Ku-Bands

Abstract: A novel planar dual-band phased array, operational in the X/Ku-bands and with wide-angle scanning capability is presented. The design, development and experimental demonstration are described. A new single-layer crossed L-bar microstrip antenna is used for the array design. The antenna has low-profile architecture, measuring only $0.33\lambda \times 0.33\lambda $ , at the low frequency band of operation, with flexible resonance tuning capability offered by the use of a plate-through-hole and field-matching ring arrangement. A 49-element planar (7 $\,\times \,$ 7) array demonstrator has been built and its performance validated, exhibiting good agreement with full-wave simulations. The dual-band array supports a large frequency ratio of nearly 1.8:1, and also maintains good sub-band bandwidths. Wide-angle scanning up to a maximum of 60 $^{\circ}$ and 50 $^{\circ}$ are achieved at the low and high frequency bands of operation, respectively.