ELCT 562_CA1

A 0.48520λ0 dipole antenna is made to work at 4 GHz. The antenna is then connected to a 12 V voltage source which has an internal resistance of 25 Ω) a) Make a diagram of the above system, b) Is an impedance matching circuit needed? If yes, where should the impedance circuit be inserted and make a diagram of the system with the adjusting circuit, c) How many cm is the length of the dipole antenna above, Solve Subparts A,B,C in 25 minutes ASAP

Design a 5-ELEMENT YAGI-UDA antenna for a 641.14 MHz frequency,with the following contents:a. Sketch of the actual antenna with its dimensions completely and computation

An attenuator can be made using a section of waveguide operating below cutoff, as shown in theaccompanying figure. If a = 2.286 cm and the operating frequency is 12 GHz, determine the requiredlength of the below-cutoff section of waveguide to achieve an attenuation of 100 dB between the inputand output guides. Ignore the effect of reflections at the step discontinuities.

Calculate the geometric factor for a resistivity test with an aperture of L=500 meters using the dipole-dipole arrangement with a factor n=8 with a value of a=50 m

2.) The power density is 4 mW/m² at some distance R from an isotropic antenna. The isotropic antenna is replaced with a different antenna and the power density measured is now 60 mW/m² at the same distance R. What is the gain (in dB) of the second antenna?  3.) The received power at an airplane is calculated as Pr=-43 dBm at a range of 13 miles using free-space propagation. Determine the received power (in dBm) at a range of 52 miles.

Consider an array of four isotropic antennas located at a distance “a” from the center of a coordinate frame as shown in the figure. Assume that all antennas are fed in phase with equal amplitudes. Obtain an expression for the array factor as a function of θ and φ.

Assuming a constant antenna size, how would the radar beamwidth change if the frequency increases from L-band to Ka-band? A. The beamwidth decreases B. The beamwidth increases C. The beamwidth stays the same D. Not enough information is given

Please show all steps A parabolic dish antenna has a diameter of 5 meter, operating at 30 GHz frequency.a)    What is the effective area Ae of the antenna? b)    What is the antenna power gain in ratio and in dBi?

A screen, having a Screening Effectiveness (S) of 31.62 at 100 MHz, is located 5 m from a 2 cm radius conductor loop that carries a signal current of 7.5 mA at a frequency of 100 MHz. Determine the maximum electric field strength transmittedthrough the screen (Et, µVm-1) resulting from radiated emissions emanating from the conductor loop.

Consider a communication link operating at 15 GHz with the transmitting and receiving antennas gain of 20 dB and 15 dB, respectively. The transmitted power is 15 W and the distance between transmitter and receiver is 12 km. (i) Determine the received signal (in dBm) for the free space condition. (ii) Repeat (i) if plane earth path loss exists and both transmitting and receiving antenna height is 10m. (iii) If there is a 20-meter tall building located at 5 km from the transmitter, determine the minimum height of transmitting and receiving antennas above ground level to ensure unobstructed LOS conditions.

What is Skip distance? Derive the relationship between critical frequency (fcr) and Skip distance (D) assuming flat earth for both antennas.

Design a 5-ELEMENT YAGI-UDA antenna for a 545 GHz frequency, with the following contents:a. Operation and its applicationb. Sketch of the actual antenna with its dimensions completelyc. Its computation

The normalized radiation intensity of a given antenna is given by(a) U = sin θ sin φ (b) U = sin θ sin2 φ(c) U = sin θ sin3 φ (d) U = sin2 θ sin φ(e) U = sin2 θ sin2 φ (f) U = sin2 θ sin3 φThe intensity exists only in the 0 ≤ θ ≤ π, 0 ≤ φ ≤ π region, and it is zeroelsewhere. Find the(a) exact directivity (dimensionless and in dB).(b) azimuthal and elevation plane half-power beamwidths (in degree

The radio path (f = 900 MHz) between a mobile phone and the base station has a loss of 30 dB in addition to the free space loss. The base station measures the level of the signal transmitted by the phone, and it sends the phone a command to set the transmit power to a level, which gives a received power level of-90 dBm. The antenna gain of the phone is 2 dB and the receive gain of the base station antenna is 7 dB. The distance between the phone and the base station is 500 m. What will be the transmit power level of the phone?

A microwave link includes two sites that are 10 km apart and uses a center frequency of 9 GHz. On either transmitter or receiver side, a 100-m transmission line that has an attenuation per unit length of 0.01 dB/m is connected to an amplifier and a parabolic reflector antenna. Other losses caused by connectors and insertions incurred on one side amounts to 3 dB. Antenna has a power gain of 20 dB. If the output of the transmitter amplifier is 30 dBm, what is the received signal level (in dBm) at the input of the receiver amplifier?

Design a Dolph-Tschebyscheff broadside array of 8 elements, 25-dB sidelobe level, and with a spacing of λ/2 between the elements to operate at 3 GHz. Choose a “rectangular patch” or a "dipole" antenna as the array element that operates at 3 GHz. For the final antenna design, determine the:  • Half-power beamwidth (in degrees). How much narrower or wider (in degrees) is thishalf-power beamwidth compared to that of a uniform array of the same number ofelements and spacing?• How much smaller or larger (in dB) is the gain (in dB) compared to that of a uniformarray of the same number of elements and spacing? Justify you answer. Do you expectit? Why?

AGILA satellite is located 36000 km above the earth’s surface. Assuming free space condition, what is the path loss in dB of the signal if the operating frequency is 3 GHz.

What will be the directive gain of an isotropic antenna? I need the solution urgently and that's why I paid. Please help.

If the material between the ground plates of a 100 ohm strip line to be used at 12 GHz has a relative dielectric constant of 2.19 and a loss tangent of 0.01, what is the dielectric loss of the strip line in Np/m?

Coexistence of radar systems. In this problem, we’re trying to determine whether two radars are interfering with each other. We will need to generate antenna patterns (uniform illumination, λ/2 spacing) for both radars and determine power densities and SNRs. Radar 1 Frequency = 3 GHz Peak power = 100 kW Circular array – diameter = 2 meters Transmit Loss = 2 dB Radar 2 Frequency = 3 GHz Peak power = 1000 W Circular array – diameter = 0.5 meters Duty 10% Dwell time = 1 ms Noise Figure = 4.5 dB Total System Losses = 10 dB Bandwidth = 1 MHz   When Radar 2 is turned on. Calculate the Radar 2 SNR on a 0 dBsm target 10 km from Radar 2 (at broadside). Answer should be in dBs.

Find the maximum range of a tropospheric transmission for which the transmitting antenna is having a height of 100 ft and the receiving antenna is 50 ft.

A halfwave dipole with a total conductor length of 1 m is used as a transmit antenna to radiate electromagnetic energy. At a distance of 500 m from this antenna in the direction of maximum radiation, what is the free space path loss (dB)? Consider the end effect of the dipole.

A parabolic antenna system is having a dish diameter of 10 m and the feed is connected at 10 GHz. What will be the value of the gain of the antenna?

For a monopole antenna with linearclinear distribution, if the effective length of the monopole is equal to half of wavelength, then estimate the radiation resistance of the monopole.

In the calculation of the radar cross-section for the surfaces and shapes more physical area will appear for;   Cubical Shape Cylindrical surfaces, Rectangular surfaces, Spherical Surfaces,

AGILA satellite is located 36000 km above the earth’s surface. Assuming free space condition, what is the path loss in dB of the signal if the operating frequency is 3 GHz. (Use two decimal places for the final answer)

At 20 GHz, the gain of a parabolic dish antenna of I meter diameter and 70%efficiency is-------

With neat diagram design the 5 element Yagi-Uda antenna for the receiving 100MHz radio signal showing design steps. Consider effective dipole length equal to 0.48 λc and spacing between elements is 0.15λc.

Increasing the transmitter power of a radar by a factor of 5 will increase the maximum range by what percent? Prove mathematically