The wireless communication serves the efficient information among two or more points wirelessly. Antenna is the main component in the communication, which radiates and receives the radio waves or in broad way. The antenna also plays a role of impedance matching device, which performs the matching of impedances like free-space & transmitter and receiver impedances at receiver end. The antennas c...

Abstmct-An annular aperture antenna mounted on an infinite ground plane and containing a hemispherical center conductor extension above the ground plane is investigated. A Green’s function for the region above the ground plane is derived so as to be compatible with numerical solution techniques. A magnetic field integral equation is obtained in terms of the unknown tangential aperture electric ...

Mode-converting metasurfaces are passive, lossless devices that can be designed to transform a set of incident modes desired transmitted modes. In this paper, mode-converting utilized synthesize arbitrary, azimuthally-invariant TM apertures. The methods presented in work used design antennas meet specific near-field and far-field criteria unlike most which solely manipulate the far field. propo...

Abstract. We describe an hierarchical, frequency-domain beamforming architecture for synthesising a sky beam from the wideband antenna feeds of digital aperture arrays. The development of densely-packed, all-digital aperture arrays is an important area of research required for the Square Kilometre Array (SKA) radio telescope. The design of real-time signal processing systems for digital apertur...

The effects of focused aperture amplitude tapering, both direct and inverse, on axial forelobes and aftlobes are investigated. Taylor tapers give low sidelobes but high forelobes and aftlobes, plus a modest gain degradation. Inverse tapers give low forelobes and aftlobes but high sidelobes and large gain degradation. Uniform excitation gives comparable axial and transverse subsidiary lobes, and...

This paper presents the design and finite difference time domain (FDTD) modeling of millimeter wave aperture coupled microstrip antenna that can be realized as a on chip antenna in wireless sensor nodes. At millimeter wave frequency, antenna form factor is very low and hence integration of this antenna with the transceiver components as a single system on-chip, minimizes power consumption and s...

This article presents an overview of the microstrip patch antenna and its design techniques. Basically a microstrip patch antenna comprises of a trace of copper or any other metal of any geometry on one side of a standard printed circuit board substrate with other side grounded. The antenna is fed using various feeding techniques like coaxial, strip line, aperture coupling or proximity coupling...