Gain as power ratio in dB Q#17 Calculate radiation resistance of single turn and eight-turn small circular loop when radius of the loop is and the medium is free space. Q#16 Given a pyramidal horn antenna with aperture dimensions of 9x8 cm and operating frequency 5GHz, then calculate a. Q#15 What is gain in dB and beam width of a helical antenna with and a pitch of when used at 100 MHz ? Calculate the gain and beam width of the antenna. Q#14 A 2.7 meter diameter parabolic reflector is used in terrestrial low link at 7.375 GHz.
How much is the new signal picked up by the receiving station. The transmitting antenna switches to a nearby antenna which has 5dB gain over the original antenna. Q#13 A receiving antenna picks up 50 micro Volt signal. Q#12 Calculate the approximate gain and beam width of a paraboloidal reflector antenna at operating frequency 4GHz, diameter 20 meters and illumination efficiency 55%. The transmission station switches to a nearby antenna which has 5dB gain over the original antenna. Q#10 What is bandwidth, in percent, for 220MHz center frequency antenna that has 3dB point at 190MHz and 240MHz? What is bandwidth ratio? Q#11 A receiving Antenna picks up 50 micro Volt Signal. Q#09 Calculate the Front to Back Ratio (FBR) of an antenna in dB which radiates 3kW in its most optimum direction and 500Watts in the opposite direction. Q#08 What’s effective area of an antenna? Show that effective area of antenna is given by the following relation: Q#07 Derive an expression for the gain of a half wave antenna and show that gain of half-wave dipole antenna is 1.641 or 2.151dB. What is the strength of magnetic field H in free space? Q#06 If the electric Field strength of plane wave is 6V/m. Q#05 Find out the field strength at 1km away from Isotropic Station of 1KW power. Calculate the effective of the antenna in meters. The power radiated Q#04 A grounded vertical antenna, fed at the bottom with an RF current of 32 Amperes at 1MHz, produce a field strength of 9 mV/meters at a distance of 100Km. The field strength at a distance of 10Km and 2. Q#03 A transmitting antenna with an effective height of 100meters has a current at base 100Amperes (rms) at frequency of 300KHz. Calculate the radiation resistance, if effective height of the antenna is 60meters. Q#02 A short vertically grounded antenna is designed to radiate at 10MHz. 4.Įlectrical Short Dipole Antenna Monopole Antenna Half-wave Dipole Antenna Vertically Earthed Antenna (b) Derive the expressions for power radiations and radiation resistance of the following antennas: 1. Q#01 (a) Prove that radiated power and radiation resistance of current element is as follows:
This is discouraged and as a result your marks will be deducted. Note: Don’t miss intermediate step and calculation while composing your response. Assignment#01 Date of issuance April 13, 2012.
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