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about how old are the oldest rocks found on earth on the moon briefly how can the absolute age of a sedimentary rock be
identify known and unknown write down relevant equations and solve the problems do not forget units please write each
in the first figure a block of mass m lies on a horizontal frictionless surface and is attached to one end of a
1 how many cells are required in a cell phone system cluster if the minimum acceptable ratio of in-cell power to
what are the power density and field strengths that might be realized in problem 15 if a transmitting antenna with a
rf power of 100 watts is radiated is otropically in free space calculate the power density 3 km from the source making
assume that the disk of the milky way has a radius of 20 kpc 20 thousand parsecs it contains 100 billion stars each
effective noise input power into a mobile receiver is -100 dbm and a signal-to-noise ratio of at least 5 db is required
the magnetic field of a plane wave propagating in free space is given by the following expressiona write a similar
1calculate the signal power that must be coupled from the antenna into the receiver in a cell phone to achieve a signal
1 a pager operating at a center frequency of 50 mhz has a noise bandwidth of 5 khz an antenna efficiency of 50 and a
1 calculate the distance that a plane wave of frequency 1 ghz must travel in free space in order for its phase to be
a receiver is made up of three cascaded stages each with a gain of 10 db and each with a noise figure of 3 dba
a receiving antenna in a satellite is attached to a matched receiver that has a center frequency of 160 ghz and a
1 an antenna with a gain of 3 dbi is in a region where incident power density is 1 microwatt per square meter calculate
1 what is the polarization mismatch factor for two linearly polarized antennas whose polarization vectors are
use lhospitals rule to find the limiting value of the pattern function for a half-wave dipole as theta rarr 0 2 a loop
a colinear array of half-wave dipoles is to be used to produce an omnidirectional radiation pattern with a directivity
for the array and phase advance in problem 42 calculate the distance from the tower in which nulls may occur in the
repeat the calculation in problem 45 for an element to corner spacing of lambdaproblem 45consider a 90deg corner
1 a microstrip patch antenna is made from a rectangular patch with a 2 cm b l2 and w 02 cm the substrate has a
1 for the patch antenna in problem 47 assume that copper and dielectric losses are negligible find the q and the 3 db
what is the effective area of a parabolic reflector antenna that would have the same directivity as the microstrip
a right-hand circularly polarized plane wave is incident on the boundary between dry air and dry earth describe the
a linearly polarized plane wave with power density s 5 times 10-9 watts per square meter is incident from free space