Engineering, 18.11.2020 17:30 alwaysneedhelp8420

Missiles with onboard radars must use durable high-temperature materials for the radome, which is the term for the covering that protects a radar or other type of antenna. One material that can be used for a high-temperature radome is alumina, a ceramic (A1,02), which has a relative permittivity of E, = 9.6 at a frequency of f = 26 GHz. Alumina is non-magnetic (u, = 1). (a) Calculate the wave impedance n of alumina (the ratio of the electric-field magnitude to the magnetic field magnitude) at 26 GHz. (b) What is the propagation constant B of a TEM wave in alumina at f = 26 GHz? (c) As you will find later in the course, a slab of lossless dielectric material one-half- wave thick can transmit essentially all of the TEM-wave energy normally incident upon it. If you wish to make a half-wave-thick radome sheet out of alumina at 26 GHz, how thick must it be? Express your answer in mm.

Answers: 2

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

Answers: 1

Answer

Engineering, 04.07.2019 18:20

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false

Answers: 2

Answer

Engineering, 04.07.2019 19:10

Plan an experiment to measure the surface tension of a liquid similar to water. if necessary, review the ncfmf video surface tension for ideas. which method would be most suitable for use in an undergraduate laboratory? what experimental precision could be expected?

Answers: 2

Answer

You know the right answer?

Missiles with onboard radars must use durable high-temperature materials for the radome, which is th...

Questions