Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Related questions
Concept explainers
Question
14
Transcribed Image Text:14. Estimate the directivity of an antenna having θ<sub>HP</sub> = 2°, and φ<sub>HP</sub> = 1°. Express your answer as a ratio of square degrees.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution
Trending nowThis is a popular solution!
Step by stepSolved in 3 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- The gain of a parabolic reflector antenna is 1000 when the frequency is 300 MHz. If the mouth of the reflector aperture is circular, then what will be the aperture of the mouth?arrow_forwardTwo antennas located at points A and B are broadcasting radio waves of frequency 96 MHz. The signals start in phase with each other. The two antennas are separated by a distance d=11.2 m. An observer is located at point P on the x axis, a distance x=97 m from antenna A. The points A, P and B form a right triangle. A) What is the phase difference between the waves arriving at P from antennas A and B? Enter your answer in radians (rad). 1.2957 rad (correct) B) Now observer P walks along the x axis toward antenna A. What is P's distance from A when they first observe fully constructive interference between the two waves? 20.0704 m (incorrect) C) If observer P continues walking until they reach antenna A, at how many places along the x axis (including the place you found in the previous problem) will they find maxima in the radio signal due to constructive interference? 4 (incorrect) Can you please help with parts B and C.arrow_forward1. Which trigonometric function is used to find the angle if the length of the hypotenuse and of the adjacent side are known?arrow_forward
- i need the answer quicklyarrow_forwardA transmitting antenna with an effective height of 100 m has a rms current of 100 A at a frequency of 300 kHz. Find the electric field strength at a distance of 10 km from the antenna.arrow_forwardIn a 3 element antenna array, the distance between the antenna elements is quarter of a wavelength. What will be the phase difference between the elements?arrow_forward
- Q1. Choose the correct answer to the following questions: A-Which of the following type of antenna has a directivity of 0 dB? a) Horn antenna b) General antenna c) Patch antenna d) Isotropic antenna B-Amongst which of the following shows the relation between half power beam width and the directivity of an antenna? a) A larger HPBW equates to more directivity HPBW equates to less directivity A smaller HPBW equates to more directivity d) None of the above c) A smaller C-The region of 0.25 m from D=1.5m antenna at 300 MHz is. a) Far field b) near field c) Fresnel field d) none D- Which of the following lobes of an antenna radiation pattern is contained the most power? a Major lobe b) Minor lobe c) Side lobe d) Back lobe E- Suppose we have a copper conductor with a frequency of 60 Hz. We need to find the skin depth of the electromagnetic wave in this conductor. Conductivity of copper (a): 5.8 x 107 S/m. the skin depth is a) 9.5 mm b) 20 mm c) 10 cm d) nonearrow_forwardAn antenna has a directive gain of 25 dB. If the antenna is transmitting at a frequency of 10 GHz, then what will be the effective aperture of the antenna?arrow_forwardIf the solid angle subtended by the main beam of an antenna is 0.5 steradian then what will be the directivity of the antenna?arrow_forward
- A shortwave transmitter uses skywave propagation. What is the angle of incidence if the MUF is 25 MHz and the critical frequency is 10 MHz? degreesarrow_forwardPlease answer in typing format solution please only typing format Please ASAP for like please answer Thanks in advancearrow_forwardc- A VHF loop antenna used to receive weather maps from satellites has an impedance of 1009 at 137MHz. This antenna will be used with a receiver whose input impedance is 50 ohms, by using figure 3: . What is the impedance of the quarter wave matching section? • What is the length of the matching section cable which has a relative dielectric constant () equal to 1.77? LOOP ANTENNA Z-10022 Receiver Z-5022 QUARTER WAVE SECTIONarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning