Protocol hierarchy in Computer network
by 1 TELNET ->Telecommunication Network: It allows TELNET clients to access resources of the TELNET server that means it allows connecting a remote machine and runs an …
by 1 by 1 Control Statement and library function of QBASIC.
by 0 (i) User define function :> A user defines function is the function that is written or stored by the programmer to do a specific, task …
(Q). A parabolic antenna having a circular mouth is to have a gain of 1000 at the wavelength of 10 cm. Estimate the diameter of the mouth and the half-power beamwidth of the antenna.
by 0 λ = 10 cm = 0.1m Gp = 1000 Gp = 6 (D/ λ)^2 D/ λ = √( Gp /6) D = √ (1000/6)*0.1 D …
(Q). A paraboloid reflector antenna with a diameter of 20m is designed to operate at a frequency of 6GHz and illumination efficiency of 0.54. Calculate the antenna gain in decibels.
by 0 D = 20 and r = 10 m, f= 6GHz k = 0.54 λ = 3*10^8/(6*10^9) = 0.05 Now, Antenna gain GP = 4π*k*A/ λ^2 = …
(Q). Determine the gain, beamwidth, and capture area for a parabolic antenna with 10m diameter dish and dipole feed at 10GHz
by 0 f = 10GHz λ = 3*10^8/(10*10^9) =0.03 and D = 10 m so, BWFN = 140 λ /D = 140*0.03/10 BWFN = 0.42O GP = …
(Q). While measuring the gain of a horn antenna the gain oscillator was set for 10GHz frequency and attenuation inserted was found to be 8.9dB. Calculate the gain of horn, the distance between two horns was 45 cm.
by 0 8.9 dB = 10log(Pt /Pr ) Pt /Pr = 7.76 Pr/ Pt = 1/7.76 = 0.1288 Given, r = 0.45 m λ = 3*10^8/(10*10^9) = …
(Q). A parabolic dish provides a gain of 75dB at a frequency of 150GHz. Calculate the area of the antenna and its 3dB beamwidth.
by 0 GdB =75dB , f = 15GHz λ = 3*10^8/(15*10^9) = 0.02 m 75= 10logG G = 31622776.6 Now, Capture Area = Directivity(G)* λ^2/4π Ae = …
(Q). Paraboloidal reflector has a diameter D=20m and is designed to operate at f=6 GHz with an illumination efficiency η= 0.54. What is the antenna gain in decibels?
by 0 The effective area = πd^2*η = π*10^2*0.54 = 54 and Wavelength, λ = 3*10^8/(6*10^4) = 0.05 m Now, the gain of the reflector antenna is …
(Q). A parabolic antenna operating at 3GHz has a gain of 26dB. Calculate the diameter of the antenna and half power point beamwidth.
by 0 λ = c/f = 3*10^8/(3*10^9) =10 cm The gain Ap = 6D^2/ λ ^2 & Ap = 10log Ap 26 = 10log Ap Ap = …
(Q).Calculate the attenuation at a frequency of 600MHz when the distance between transmiting and receiving antenna is 40km and gains are 20 dB
by 0 GT = GR =20 dB d = 40 km f = 600 MHz then , (Pr /Pt ) = GT (dB)+GR (dB)-Ls (dB) ———————(a) where, …