Contents
How does a patch antenna work?
Working of Patch Antenna. A microstrip or patch antenna operates in a way that when current though a feed line reaches the strip of the antenna, then electromagnetic waves are generated. The waves from the patch start getting radiated from the width side.
What is gain of patch antenna?
They are usually employed at UHF and higher frequencies because the size of the antenna is directly tied to the wavelength at the resonant frequency. A single patch antenna provides a maximum directive gain of around 6-9 dBi.
How can you tell if an antenna is polarized?
For most antennas it is very easy to determine the polarization. It is simply in the same plane as the elements of the antenna. So a vertical antenna (i.e. one with vertical elements) will receive vertically polarised signals best and similarly a horizontal antenna will receive horizontally polarised signals.
Why do we use microstrip patch antenna?
Compared with conventional antennas, microstrip patch antennas have more advantages and better prospects. Moreover, the microstrip patch antennas can provide dual and circular polarizations, dual-frequency operation, frequency agility, broad band-width, feedline flexibility, beam scanning omnidirectional patterning.
How can I improve my patch antenna efficiency?
If concern is antenna efficiency then material losses (copper or dielectric losses) are an important factor. You can apply reflecting surfaces, active component, EBG structure or slot matching etc to improve radiation efficiency.
Why we use FR4 substrate?
FR4 epoxy glass substrates are the material of choice for most PCB applications. The material is very low cost and has excellent mechanical properties, making it ideal for a wide range of electronic component applications.
What is the polarization of a patch antenna?
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. Figure 5.27. Basic Layers in a Patch Antenna
How is a circularly polarized microstrip antenna generated?
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.
What are the disadvantages of a patch antenna?
The main disadvantage of these antennas is their relatively large size compared to other types of antennas. 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.
What kind of polarization is used in space wave propagation?
This type of polarization is mainly used by the antenna that is employed in space wave propagation. Circular Polarization: Antennas that are designed to radiate horizontally, vertically along with all planes in between are called circularly polarized antenna.