How is antenna efficiency calculated?
Antenna Efficiency is the ratio of power radiated (Prad) by the antenna to the power supplied (Ps) to the antenna. The efficiency of an antenna is usually measured in an anechoic chamber where an antenna is fed with some power and the strength of the radiated electromagnetic field in the surrounding space is measured.
What is the efficiency of microstrip antenna?
The simulated results shows the optimization of radiation efficiency from -3.807 db to -1.659 db and total efficiency also improved from -8.857 db to -5.146 db. Keywords – Radiation efficiency, Rectangular microstrip patch antenna, Resonating frequency, Total efficiency, WLAN.
What is total efficiency of antenna?
The efficiency of an antenna is a figure-of-merit that describes what percentage available to an antenna radiates. Total efficiency is the ratio of the radiated power to the power incident from the network; it includes both the reflection loss and dissipation of power energy in the antenna.
How do you increase the efficiency of a patch antenna?
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.
What is high efficiency antenna and low efficiency antenna?
A high efficiency antenna has most of the power present at the antenna’s input radiated away. A low efficiency antenna has most of the power absorbed as losses within the antenna, or reflected away due to impedance mismatch.
What is the efficiency of antenna aperture?
According to the standard definition, “Aperture efficiency of an antenna, is the ratio of the effective radiating area (or effective area) to the physical area of the aperture.” An antenna has an aperture through which the power is radiated.
Is also called as 3 dB bandwidth Mcq?
Explanation: half power bandwidth is also called the 3 db bandwidth.
What is the directivity of isotropic antenna?
The directivity of an antenna is defined as the power density of the antenna in its direction of maximum radiation in three-dimensional space divided by its average power density. The directivity of the hypothetical isotropic radiator is 1 or 0 dB. The directivity of a half-wave dipole antenna is 1.64 or 2.15 dB.
How do you calculate the gain of a microstrip patch antenna?
The gain of an antenna is defined as the ratio between the maximum radiation intensity in a given direction to the maximum radiation intensity from a reference antenna in the same direction, the achieved gain of the micro strip patch antenna is 7.7082 dB for 3.8GHz , where the figure 9 shows the gain of the antenna.
What is gain in microstrip patch antenna?
Conclusion. A unidirectional and low profile microstrip patch antenna of 0.069 has been introduced. Using a second layer of FR-4, which is coated with copper, reduced the back lobe and enhanced the gain up to 5.4 dB as well as increased the directivity up to 7.74 dBi with F/B ratio of 9.5 dB.
How is antenna bandwidth calculated?
Bandwidth for antenna can be calculated taking reference level of VSWR=2, or reflection coefficient =-10dB or return loss =10dB. Where, (fmax + fmin)/2 is called center frequency (fc). So, for wideband antennas %bandwidth must be calculated with respect to center frequency.