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q if an antenna has an available noise power of 16 times 10-15 w in a 1-mhz bandwidth find the antenna
q two stations using identical antennas with diameters of 50lambda and aperture efciencies of 06 at 35 ghz are separated by 30 km with negligible
two stations located on mountain tops 40 km apart communicate with each other using two identical paraboloidal antennas with pencil beam- width of
q a paraboloidal antenna has an aperture efciency of 06 and a diameter d 100lambda at 6 ghz illumination by the feed is such that the beamwidths of
q aconical horn has a side viewas shown in figure the maximum value ofthe directive gain is given by gd sim 513dlambda2 where d radic333lambdal1
q the effective area of a dipole is given by ae 013lambda2 find the effective area of a half-wave dipole at 3
q the radiation pattern of a half-wave dipole antenna is given bya sketch the radiation pattern in the principal plane of xz containing angle thetab
q an antenna has beam widths of 3deg and 10deg in orthogonal planes and has a radiation efciency factor of 06 find the maximum radiation inten-sity
q the power gain of an antenna is 10000 if its input power is 1 kw calculate the maximum radiation intensity that it can
q an antenna has an aperture area of 10 m2 an aperture efciency of 06 and negligible losses if it is used at 5 ghz determinea its power gainb the
q amicrowave relay systemuses two identical horn antennas mounted on towers spaced 40 km apart if fc 6 ghz and each relay hop has l 60 db calculate
q a satellite radio transmitter has pin 3 w and gt 30 db the receiving antenna has a circular aperture with radius r at the ground station 30000 km
q a signal with bandwidth of 100 mhz is to be transmitted 40 km by los radio transmission taking bfc 130 and using a circular-apertureparabolic dish
q describe the following phasor equations represented in the time domaina macr e k1e-macr gammazb macr e k2e macr gammazwhere z is the space
a now consider a typical open-wire transmission line with parameters of r 14 mi l 46 mhmi c 001 microfmi and g 03times10-6smi if the line
q a source of impedance macr zs rs 100 has an open-circuit voltage vst 125 cos omegaot and drives a 75- transmission line terminated with a 75-
q the cutoff frequency of a dominant mode in an air-lled rectangular waveguide is 3 ghz what would the cutoff frequency be if the same wave - guide
q a what is the difference between a tem mode and a te modeb explain the terms cutoff wavelength and dominant mode as applied to waveguides find the
q comment briey on the followinga why are waveguides not used at low frequenciesb why are open-wire lines not generally used as guiding structures at
q a transmission line with a dielectric epsilonr 35 is 100 m long at a frequency of 10 ghz how many wavelengths long is the
q a transmission line with air dielectric is 25 m long find in wavelengths how long the line is at frequencies of 1 khz 10 mhz and 100
q it is desired to cut a lambda4 length of rg58au cable epsilonr 23 at 150mhzwhat is the physical length of this
q find the diameter of a circular waveguide that will have a lower cutoff frequency of 10 ghz and also specify its largest usable
q an rg-139u rectangular waveguide is given to have dimensions a 08636 mm and b 04318 mm compute the theoretical and practical frequency ranges of
q for an rg-290u aluminum rectangular wave - guide a 5842 cm and b 2921 cm compute the theoretical and practical frequency ranges of operation for