What do you mean by antenna gain, Electrical Engineering

Assignment Help:

Q. What do you mean by Antenna gain?

Antenna gain depends on both shape and size. Dipole antennas, commonly used at lower radio frequencies, are made up of a rod or wire of length λ/10 to λ/2, and have an antenna-gain range of 1.5 to 1.64 (1.8 to 2.1 dB). Horn antennas and parabolic dishes (so named after their shapes) have much more gain at higher frequencies. A useful, although approximate, expression for gain is given by

1848_Dipole antennas.png

where λ is the wavelength being transmitted (or received), and Ae is the effective aperture or effective area of the antenna. Power amplifiers are needed to overcome the radio-transmission loss just as in a transmission-line system. Similar considerations hold for optical radiation, in which the electromagnetic wave takes the form of a coherent light beam.


Related Discussions:- What do you mean by antenna gain

Self-inductance and the induced e.m.f, Self-inductance and the induced e.m....

Self-inductance and the induced e.m.f Inductance is the name given to the property of a circuit whereby there is an e.m.f induced into the circuit by alter of flux linkages pro

Discuss the approximate effect on the characteristic, Consider a three-phas...

Consider a three-phase induction motor with a normal torque-speed characteristic. Neglecting the effects of stator resistance and leakage reactance, discuss the approximate effect

What is effect of overheating on an electric insulator, What is the effect ...

What is the effect of overheating on the life of an electric insulator? An insulator is designed to withstand amount of heat. However, when an insulator is overheated so dielec

Digital communication systems, Q. Digital communication systems? Today ...

Q. Digital communication systems? Today digital communication systems are in common use, carrying the bulk of our daily information transmission through a variety of communicat

What do you mean by oscilloscope, Q. What do you mean by Oscilloscope? ...

Q. What do you mean by Oscilloscope? To measure time-varying signals (voltages and currents), an instrument known as an oscilloscope is employed. It can be used as a practical

Guarding Against Loss in Transformers, Guarding Against Loss in Transformer...

Guarding Against Loss in Transformers Distribution transformers are expected to convert up to 95-98% of the input power into usable output power. A distribution transformers i

Dielectric heating - stepper motor , Dielectric Heating Dielectric  l...

Dielectric Heating Dielectric  losses  occur in  insulating materials. These are same  as hysteresis losses  in magnetic materials. When  an alternating  electric  field  is a

Explain aas instructions in 8086 family, Explain AAS instructions in 8086...

Explain AAS instructions in 8086 family with example and their effect on flag. AAS: it is stands for ASCII adjust after subtraction; this is used to adjust the AX register l

Wcdma, what is that mean and explain

what is that mean and explain

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd