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Detailed Solution. Polarization: This is the orientation of the electric vector at a fixed position in space with time. Some antenna types, among them the helical antenna, produce elliptic or circular polarization inherently, without having two feed points.

The circular loop antenna consists of a ring of radius b made of highly conducting metal with circular cross section of radius a ≪ b. It is driven at Φ = 0 by a delta-function generator with voltage V, as shown in Fig. 4.1.

use in radar

…are asymmetrical, the use of circular polarization can enhance the detection of aircraft in rain. With circular polarization, the electric field rotates at the radar frequency.

It was decided to design a patch antenna from the theoretical study since it fulfils all the requirements for the antenna. Simulations and tests shows that the antenna is circular polarized and have a maximum reading distance of 5 m for 868 MHz.

Conventional designs of single-feed micro strip antennas for circular polarization (CP) are usually achieved by truncating patch corners of a square patch, using nearly square or nearly circular patches, cutting a diagonal slot in the square or circular patches, protruding or inserting a pair of symmetric perturbation ...

Circular Polarization: In a circularly-polarized antenna, the plane of polarization rotates in a corkscrew pattern making one complete revolution during each wavelength. A circularly- polarized wave radiates energy in the horizontal, vertical planes as well as every plane in between.

Circular polarization is obtained by either of the two techniques: by changing width-to-length ratio of the patch or the dimensions of the mushroom-like structure. Use of coaxial feed implies low impedance and axial ratio bandwidths. The antenna has an impedance bandwidth of 4.6 % and axial ratio bandwidth of 1.46 %.Apr 29, 2016

Antenna Frequency is defined as the number of cycles of a wave per second. ... The device and antenna are designed to only pick up a certain frequency, for example a Wi-Fi router will operate at 2.4 GHz and a FM radio operates around 0.1 GHz.Feb 3, 2015

A rectangular microstrip patch antenna normally radiates a linearly polarized wave with about 6-7 dBi gain at broadside. Higher gains (up to 10 dBi) can be achieved by using different means including large patch heights and parasitic patches.