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Application: Simple dipole antenna. Suppose you need a good antenna in a hurry for a CB (citizen's band) transmitter at 27 MHz. A friend suggests the following: Take a two wire cable, with impedance of 72 Ω. Split the cable for a length of 2.77 m. Bend the two wires so that they are perpendicular to the cable and on a line as shown in Figure 18.43. To support it, the friend suggests tacking it onto a non-conducting wall.
(a) What kind of antenna is this antenna?
(b) If the conductor is 1-mm thick and made of copper (σ = 5.7 x 107 S/m), what is the efficiency of the antenna?
You are asked to design a system that will improve the cooling system for microprocessors that resembles the Intel Pentium®4. The Pentium 4 processor is packaged in a Flip-Chip Land Grid Array package that interfaces with the motherboard.
aaa estimates that every year more than 10000 drivers swerve off the road and end up submerged in water. this
For a geometrically similar 1/10 size model, what is the relationship between the drain time for the model and the corresponding drain time for the actual parking lot? Assume all similarity requirements are satisfied. Can water be used as the mode..
What is the velocity of a point on the cam interfacing the follower?
A 0.03-lb bullet traveling at 1300 ft> s strikes the 10-lb wooden block and exits the other side at 50 ft> s as shown. Determine the speed of the block just after the bullet exits the block, and also determine how far the block slides before it..
10 kg of gaseous oxygen is compressed in a piston-cylinder device from an initial state of .8 m3kg to a final state of
The patch is applied to the skin, which contains an initial drug concentration of pA,s,i = 0. At the patch-skin interface located at x = 0, the ratio of the medication density on the patch side to the medication density on the patient side is desc..
1 kg of propane is contained in a piston - cylinder assembly at a constant pressure of .20 mpa heat transfer slowly to
a pump accepts liquid water at 60 acircdegf and 14 psia and compresses it to a pressure of 100 psia. the pump has a
Application: The dipole antenna. A dipole antenna is 1 m long and is fed with a current of amplitude 2 A. Find the radiated power of the antenna
Assuming the dry unit weight of sand to be 16 kN/m3, estimate the average peak friction angle, f 9, of the sand. Use Eq. (3.53).
the shovels dimensions are a53.0 mm b 212mm. c 318mm. d106mm. e 371mm. find the reaction force at e. assume that the
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