In a satellite communication, the power delivered to a matched receiver, PR, is given by the Friis equation: where Pr is the received power, Pr is the transmiter power, G, is the transmitter gain and Gg is the receiver gain, r is the distance between the transmitter and receiver antennas and A is the wavelength. If the nominal transmitter output power is 100 Watts for a DIRECTV DBS and the transmitting antenna gain is 31dB, evaluate the received signal power if the 40cm diameter receiving dish has a nominal gain of 30DB. Assume that the operating frequency is 13GHZ, the range between the transmitting and receiving antennas is 35,786 km, and the receiving antenna is directly below the satellite.

Q: Problem # 4 Let the carrier be given by cos (106 t) and let the message signal be m(t) = 2 cos…

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Q: modulated signal is generated using a carrier signal with frequency fc = 20 kHz and a message signal…

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Q: Compute the Rayleigh distance of a square antenna with 10dB gain if the carrier frequency is 930MHz.

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Q: A radar antenna used for both transmitting and receiving has a gain of 150 at its operating…

A: The received signal power is given by the expression as shown below: Pr=PtAe2σ4πλ2R4Pt=Transmitted…

Q: A narrow band frequency modulated (NBFM) signal is given by s(t) = 2cos (2nfet) + 0.2 sin(2πfmt…

A: Given data st=2cos2πfct+0.2sin2πfmt+0.2πsin2πfct Carrier frequency, fc=140 kHz Message frequency,…

Q: Q3/ If transmitter produced 20W of power is applied to an antenna with gain equal to 1 with 1000MHz…

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Q: B The r.m.s. antenna current of an AM transmitter increased by 15% over the un- modulated value and…

A: For the given AM transmitter antenna current and its side band power the value of the transmitted…

Q: Find the expression for the power radiated. What is the power radiated for peak antenna current 10…

A: Given information: The value of the peak antenna current is I=10 A. The expression for the power…

Antenna Characteristics

The antenna is an important concept in the domain of electronics and communication engineering. An antenna forms an integral part of many commonly used devices such as wireless modems, routers, game controllers, mobile phones, bluetooth devices, and so on. In simple terms, any wireless communication makes use of antennas to serve the purpose. An antenna, also known by the term 'arial', is an electrical device that converts electrical signals into electromagnetic waves or electromagnetic waves into electrical signals. An antenna contains a transmission line usually made up of co-axial cable, it then receives the signals and converts them into electromagnetic waves, which are then transmitted via space into their required destination. A communication system essentially makes use of two antennas, a transmission antenna, which converts electrical signals into electromagnetic waves, and a receiving antenna, which receives the electromagnetic waves and converts them back into electrical signals.