Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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A parabolic dish antenna has efficiency 85% and aperture area 3m². At a
frequency of 12.85 GHz, what is its gain?( need handwritten only ,otherwise downvote.)
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- a) A research paper presents a novel antenna which consists of a resonant slot in an aluminium plate. The slot is surrounded by a cavity and two corrugations. The proposed Ku-band antenna has an aperture efficiency of 74.3% and a measured gain of 12.2 dBi at 13 GHz. Answer the questions below. i) The equation below gives the relationship between the directivity of an antenna and its maximum effective aperture (Aem). Use this equation to derive an expression for the gain of an antenna in terms of its effective aperture. 4π -Aem 2² ii) Calculate the effective aperture and the physical aperture of the antenna. D = iii) If the directivity of the antenna is 14.3 dBi. Calculate the conduction dielectric loss efficiency of the antenna in dB.arrow_forwardAt 20 GHz, the gain of a parabolic dish antenna of I meter diameter and 70%efficiency is-------arrow_forwardI need the answer as soon as possiblearrow_forward
- Problem 4. We need to allocate requirements to a parabolic antenna gimbal system and spacecraft. Our aperture size is 1 meter in diameter and transmission frequency is 5 GHz. We need to maintain pointing loss to < 0.5 dB. a. What is the ideal gain, at peak of beam, for the antenna at the given frequency? b. What is the beam width in degrees, using the equation given in class? c. What is the maximum allowed pointing error to not exceed the pointing loss?arrow_forwardThe rate of fall of current in a diode with reverse recovery charge and reverse recovery current of 59 µC and 37.5 A respectively is_______________________ A/µs .arrow_forward
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