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Linear antenna array. Linear antenna array. An array antenna is made of six iden tical elements, each a half-wavelength dipole, and is fed with identical currents, all in phase. Spacing of the elements is one-half wavelength. Assume the antennas are placed on the x axis, and are parallel to the z axis. Find:
(a) The array field radiation pattern.
(b) The array power radiation pattern.
(c) The direction of maximum radiation.
(d) The direction of the side lobes.
Determine how you would design a planar shield to attenuate a far field signal by 15 db. Assumethat the incoming signal has a flat frequency spectrum from about 100 Hz to 10 MHz. Signalsabove 10 MHz and below 100 Hz can be considered to be negligible..
A positive sequence three phase source has Van(t)= 200cos(wt+120) V. Find time domain expressions for vbn(t), Vcn(t), Vab(t), Vbc(t), and Vca(t).
Let the input to a singly-balanced mixer, f(t), be given by V0 Sin (2 pi fs t). The local oscillator input p(t) is a square wave, alternating between 0 and +1 volt. The freqency of the square wave is 10 MHz, while for the input, fs is 100 KHz.
A system is called complex if a real-valued input can produce a complex-valued output. Suppose a linear, time-invariant complex system has an impulse response of h(t)= j[u(-t+2)-u(-t)]
A particular tachometer displays engine RPMs from zero to10,000.If the ADC accepts voltage levels from zero to fivevolts,in order to achieve full-scale representations from the tachometer, what should the output voltage be at 8500 RPM
1) Compute the average power dissipated through the resistor 2) compute RMS voltage across the resistor 3) compute V RMS^2/R. 4) prove that P avr=V RMS62/R for any periodic voltage waveform
When electros and holes are present in a semi-conductor, the presence of an electric field produced by an external voltage will cause this carries,which have changes of oposite sign, to move in opposite directions.
Determine the left triceps muscle force (Ftri), elbow joint reaction force (Rj) required to hold this position along with any ground reaction forces (Rg) and/or reaction moments (Mg) in the hand. Show all necessary free body diagrams along with th..
A digital communications system is being designed with the goal of transmitting 32 kbits/s over a channel having a bandwidth of 8 kHz. Determine (a) the number of encoding levels required and (b) the minimum signal-to-noise ratio required in the c..
Assume that a given transformer is 100% efficient; that is, the power being supplied by the primary side is transported without loss to the secondary side. (Transformers are not 100% efficient. One can detect this by the heat that they radiate.)
Calculate the surface charge density induced on the plate as a function of the radius r from the foot of the perpendicular drawn from the charge.
A signal conditioner is constructed with a INA114 instrumentation amplifier. A feedback resistor of 750 O is used. Determine the gain of the amplifier.
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