What is circular loop antenna?
Which antenna can produce circular polarization?
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.
What is circular loop antenna?
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.
What is circular polarization used for?
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.
Is patch antenna circular polarization?
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.
How do you get circular polarization in patch antenna?
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 ...
What is circular polarization in antenna?
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.
How do you find circular polarization?
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
What is antenna frequency?
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
What is the polarization of microstrip patch antenna?
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.
What are the advantages of circular polarization?
Benefits or advantages of Circular Polarization
➨No polarization adjustment is required as it is fixed using OMT (Orthomode Transducer). ➨There is less chance of cross pol interference. ➨RFID reader does not have to be on the same plane and similar heights as RFID tags unlike linear polarization RFID reader.
Is circular polarization better than linear?
If all the tags you need to read will be on the same plane and aligned with the plane of the antenna, then you should consider a linear polarized antenna. If your tag orientation is not something that will be reliable or consistent, then you will likely need to use a circular polarized antenna.Apr 3, 2013
Where are patch antennas used?
The patch antenna is mainly practical at microwave frequencies, at which wavelengths are short enough that the patches are conveniently small. It is widely used in portable wireless devices because of the ease of fabricating it on printed circuit boards.