Concept explainers
Repeat Problem 9.4 for an antenna with
Determine the following:
- (a) The direction of maximum radiation.
- (b) Directivity.
- (c) Beam solid angle.
- (d) Half-power beamwidth in the x-z plane.
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Check out a sample textbook solutionChapter 9 Solutions
Fundamentals of Applied Electromagnetics (7th Edition)
- 1. In an isotropic source, the directivity is unity because No one of them Uo, U and Umax are equal to each other Uo, U and Umax are different from each other 2. If the radiation lobe in a direction different form the intended lobe. the lobe called back lobe Major lobe side lobe 3. If the radiating property of an antenna is best in some directions than in others, this called Omnidirectional Radiator Directional Radiator Isotropic Radiator.arrow_forwardA shirt vertical grounded antenna is designed to radiate at 10 MHz. What will be radiation resistance of the antenna is the effective height of the antenna is 60 m?arrow_forwardIf the diameter of a parabolic reflector antenna is 1.5 m, then what will be the half power beamwidth of the antenna? Assume the wavelength of radiation to be 0.5 m.arrow_forward
- 9. If the beam width of an antenna in two orthogonal planes are 300 and 60°. Then the directivity of the antenna is: a) 24 b) 18 c) 36 d) 12arrow_forwardDesign a dipole antenna with 1 reflector and 3 director whose frequency is operating from 115MHz to 255 MHz. (Use equations and Special characters in your solutions and answers) Compute for the: 4. Length of Director, L 5. Length of Reflector, LR 6. Spacing from Director to Driven Element, S R-DE 7. Spacing from Driven Element to Director, S DE-D 8. Spacing from Director 1 to Director 2, S D1-D2 9. Spacing from Director 2 to Director 3, S D2-D3 10. Length of Boom, LBarrow_forwardThe figure below shows a radio-wave transmitter and a receiver separated by a distance d = 47.0 m and both a distance h = 27.0 m above the ground. The receiver can receive signals both directly from the transmitter and indirectly from signals that reflect from the ground. Assume the ground is level between the transmitter and receiver and a 180° phase shift occurs upon reflection. Determine the longest wavelengths that interfere in the following ways. O Transmitter Receiver (a) constructively (b) destructivelyarrow_forward
- 3- The half wave dipole is widely used in more applications compared to other linear antenna lengths, that is because a) It has high gain d) it has small size b) its easy matching to coaxial 75 Ohm cable c) low lossarrow_forwardb) A particular antenna has a VSWR of 2.4. Determine the following and, in each case, show full working: i) Reflection coefficient. Please transpose the equation for VSWR and show your working. ii) Calculate the mismatch efficiency of the antenna. Show your working.arrow_forwardShow that the directivity of isotropic antenna is 1.arrow_forward
- Multiple Choice Questions (MCQ): (15 M 1. For a horn antenna, in which flaring is done only in one direction is a) Conical antenna b) Sectoral antenna c) Pyramidal horn antenna d) Exponential horn antenna 2. Wave unaffected by night or day is a) Ground wave b) Skywave c) Space wave d) Tropospheric wave 3. When a wave is incident normally then the acceptable highest frequency at which signal can be returned is the a) critical frequency b) LUF c) optimum frequency d) dominating frequency 4. High frequency range is from? a. 0.3 to 3 MHz b. 3 to 30 MHz c. 30 to 300 MHz d. 3to 30 MHz 5. The actual permittivity of a medium whose relative permittivity is 5. a) 4.43*10-¹1F/m b) 4.43*10-¹2F/m c) 4.43*10¹¹F/m d) 4.43* 10¹2F/marrow_forwardFor a helical antenna, the radiation resistance is 250 ohms and the loss resistance is 50 ohms. Estimate the radiation efficiency of the antenna?arrow_forwardConsider a 90° corner reflector antenna with a half-wave dipole as the driving element and an element to corner spacing of lambda/2. Calculate the directivity:arrow_forward
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