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For wideband antennas with unidirectional patterns, it is a troublesome problem to stabilize the antenna patterns across a very large frequency band. In our work, cavity-backed structures are utilized with bowtie exciters. The patterns of the proposed cavity-backed triangular bowtie antenna (TBA) with rounded corners can be stabilized within a 92% frequency band without side lobes, by placing a circular...
Electrically small dipole antennas with ka less than 0.5 exhibit low radiation resistance, high capacitive reactance and high Q factor which is inversely proportional to antenna bandwidth. Here, the k is the free space wave number and a is the radius of an imaginary sphere which circumscribes the whole antenna. Spherical dipole antennas potently have higher effective volume if compared to other small...
An equiangular spiral antenna backed by a cavity is investigated using the electric and magnetic fields obtained using Yeepsilas FDTD method. Strip absorbers are placed inside the cavity. Antenna configuration parameters other than the cavity height Hcav are fixed throughout this paper, where the cavity diameter Dcav is chosen to be 120 mm (slightly larger than the antenna diameter of 113 mm). The...
It is well known that a monopole antenna above a ground plane radiates an omni-directional beam around its axis. The height of this monopole can be reduced by using top-loading techniques. One such technique involves attaching a patch to the top of a monopole for use as a microwave antenna. In this case the structure is recognized as a low-profile, center-fed patch antenna. When the antenna height...
A broad band antenna consisting of half wave strip dipoles the arms of which are printed on opposite sides of a thin substrate is proposed. Four-element array is fabricated. The feed network comprised of power dividers and impedance transformers is designed to improve antenna performance. Antennas have bandwidth greater than 21% for VSWR<1.5 (without reflector) and 20% for VSWR<2 (with reflector)...
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