Question

In: Physics

2 A rectangular search radar antenna is 2.5m wide by 1.4m high. It has an azimuth...

2 A rectangular search radar antenna is 2.5m wide by 1.4m high. It has an azimuth length efficiency of 0.78 and elevation length efficiency of 0.65 and is operating at 13GHz. For this antenna, calculate: a. Azimuth and elevation beam widths; b. Effective aperture; and Gain c. If the elevation efficiencies are improved to 100%, what is the effect on beam width? Justify your answer.

Solutions

Expert Solution


Related Solutions

: A rectangular plate 1.5m wide and 2.5m deep is placed vertically in water so that...
: A rectangular plate 1.5m wide and 2.5m deep is placed vertically in water so that the center of plate is 4m below the free surface. Determine the total pressure and the depth of center of pressure. State also whether the equilibrium is stable or unstable. The above rectangular plate is taken out of the water which weighs 350.5 N in air and 173.3 N in water of specific gravity 0.99. Find the volume and specific gravity of the plate....
A 2-m-high, 4-m-wide rectangular advertisement panel is attached to a 4-m-wide, 0.15 m-high rectangular concrete block...
A 2-m-high, 4-m-wide rectangular advertisement panel is attached to a 4-m-wide, 0.15 m-high rectangular concrete block (density = 2300 kg/m3) by two 5-cm-diameter, 4-m-high (exposed part) poles, as shown in the figure. If the sign is to withstand 150 km/h winds from any direction, determine (a) the maximum drag force on the panel, (b) the drag force acting on the poles, and (c) the minimum length L of the concrete block for the panel to resist the winds. Take the...
A rectangular channel 2 m wide has a bottom slope of 0.01 and a roughness coefficient...
A rectangular channel 2 m wide has a bottom slope of 0.01 and a roughness coefficient of 0.017. A sluice gate 2 m wide is located in the channel. The sluice gate has a contraction coefficient of 0.61 and a discharge coefficient of 0.58. The depth of water just upstream from the gate is 2 m. The depth of water just downstream from the gate is 0.5 m. Determine how far upstream from the gate the depth of water will...
Problem 2: A rectangular concrete beam measures 350mm wide and has an effective depth of 425mm....
Problem 2: A rectangular concrete beam measures 350mm wide and has an effective depth of 425mm. Compression steel consisting of two # 25 is located 65mm from the compression face of the beam. If f ′ c=28MPa and fy = 420MPa, what is the design moment capacity of the beam, according to the ACI code, for the following alternative tensile steel area. (a) As = 3 # 32 bars in one layer, (b) As = 5 # 29 in two...
Problem 2: A rectangular concrete beam measures 350mm wide and has an effective depth of 425mm....
Problem 2: A rectangular concrete beam measures 350mm wide and has an effective depth of 425mm. Compression steel consisting of two # 25 is located 65mm from the compression face of the beam. If f ′ c=28MPa and fy = 420MPa, what is the design moment capacity of the beam, according to the ACI code, for the following alternative tensile steel area. (a) As = 3 # 32 bars in one layer, (b) As = 5 # 29 in two...
A high-­viscosity oil is transported through a wide rectangular duct of length L, width W and...
A high-­viscosity oil is transported through a wide rectangular duct of length L, width W and depth 2B via pressure-­driven flow. The duct is inclined at an angle b? below the horizontal plane (gravity may be assumed to act downwards in the vertical direction), and is sufficiently broad that edge effects may be neglected in the transverse (x2) direction. The pressure at the upstream end of the duct (x1=0) is Po, and at the downstream end (x1=L) is PL. The...
An asphalt rectangular channel is 7m wide and has a slope of 1° . The water...
An asphalt rectangular channel is 7m wide and has a slope of 1° . The water is 1.5m deep. Find the discharge rate for uniform flow. What is the radius of an asphalt cylindrical channel, which is half-full, to give a similar discharge rate?
A rectangular room is 12 meters long, 6 meters wide, and 3 meters high. 1] Calculate...
A rectangular room is 12 meters long, 6 meters wide, and 3 meters high. 1] Calculate the first three axial modes for the length of the room.   2] Find the wavelength, then convert to frequencies, assuming that the speed of sound in the room is 343 m/s. 3] Calculate the first 3 axial modes [Wavelenghts and frequencies] for the width of the room. 4] Calculate the first axial modes [Wavelenghts and frequencies] for the height of the room. It is...
A rectangular channel 6m wide by 1m deep is lain on slope of 0.001 and has...
A rectangular channel 6m wide by 1m deep is lain on slope of 0.001 and has roughness coefficient of n = 0.013. What is the mean velocity of flow (m/s) when the canal is full? What is the maximum capacity of the channel in m3/s? If the most efficient rectangular section is used, what depth of canal is required for the same discharge, slope, and roughness coefficient?
A closed rectangular tank 1.2 m high, 2.4 m long and 1.5 m wide is two-thirds...
A closed rectangular tank 1.2 m high, 2.4 m long and 1.5 m wide is two-thirds full of gasoline (specic gravity 0.8). Calculate the acceleration which may be imparted to the tank so that the bottom front end of the tank is just exposed. Also calculate the total forces on each end of the tank and show that the dierence between these forces equals the unbalanced force necessary to accelerate the liquid mass in the tank.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT