What is the polarization of patch antenna?
5.9. For example, some patch antennas are approximately half a wavelength on each side. The polarization can be either circular or linear depending on the design of the patch. In a patch antenna, most of the propagation is above the ground plane and can have high directional gain.
What is feed line in microstrip antenna?
Context in source publication 1) Microstrip Line Feed: In this type, a conducting strip is connected directly to the edge of the Microstrip patch as shown in Fig. 2. The patch is wider than the conducting strip. Thus the feed can be etched on the same substrate to provide a planar structure.
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 are the different ways to achieve polarization in 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.
Is a patch antenna directional?
A patch antenna (also microstrip) is a directional low profile, low-cost antenna that can be fabricated onto a flat surface, including a Printed Circuit Board (PCB).
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 %.
What is feeding technique in antenna?
The aperture feed technique consists of two dielectric substrates, namely antenna dielectric substrate, and feed dielectric substrate. These dielectric substrates are separated by a ground plane, which has a slot at its center. The metal patch is placed on top of the antenna substrate is shown in figure 5.
What is feeding mechanism in antenna?
The antenna feed system or antenna feed is the cable or conductor, and other associated equipment, which connects the transmitter or receiver with the antenna and makes the two devices compatible. On an antenna the feed point is the point on the driven antenna element at which the feedline is connected.
What is the importance of knowing the antenna polarization?
Antenna polarization is an important consideration when selecting and installing antennas. Most wireless communication systems use either linear (vertical, horizontal) or circular polarization. Knowing the difference between polarizations can help maximize system performance for the user.
Which of the following antenna exhibits circular polarization?
Helical Antenna: It is a combination of an array of horizontal and vertical wires giving a polarization in both directions resulting in the circularly polarized wave.
How to design a microstrip fed antenna?
The first design is fed by microstrip line feed, the second is fed by proximity feeding and the third is fed by aperture feeding. The design of the microstrip fed antenna requires parametric studies on the antenna diameter and the distance between the patch center and the truncation.
How circularly polarized is a circular patch antenna?
This thesis presents a new design for a circularly polarized antenna based on a circular microstrip patch. Circular polarization is generated by truncating two opposite edges from a circular patch antenna at 45° to the feed. The truncation splits the field into two orthogonal modes with equal magnitude and 90° phase shift.
Do microstrip antennas generate circular polarization?
Microstrip antennas on their own do not generate circular polarization. Circular polarization is achieved in microstrip antenna by either introducing a perturbation segment to a basic single fed microstrip antenna, or by feeding the antenna with dual feed equal in magnitude but having 90° physical phase shift.
Can microstrip patch antennas be used for RFID?
Microstrip patch antenna offers a potential solution and therefore is a popular printed resonant antenna for narrow-band applications. In this paper, a 2.42 GHz inset fed patch antenna has been designed for RFID applications with a gain of 4.6772dB and a return loss of -21.0579 dB. Index Terms—RFID, antenna, reader, inset fed, gain. I.