Homework Help is Here – Start Your Trial Now!
Engineering
Electrical Engineering
How did they get 10000 in working below? Why is the lobe at -10dB?

How did they get 10000 in working below? Why is the lobe at -10dB?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
See similar textbooks
icon
Related questions
Question
How did they get 10000 in working below? Why is the lobe at -10dB?
A 6 GHz common-carrier microwave communications link uses a tower-mounted antenna with a gain of 40 dB, and a transmitter power of 5 W. To evaluate the radiation hazard of this system, calculate the power density at a distance of 20 m from the antenna. Do this for a position in the main beam of the antenna, and for a position in the side lobe region of the antenna. Assume a worst-case side lobe level of -10 dB. Note: The recommended safe power density is as low as 0.2 mW/cm² at the lower RF range of around 100 MHz because the fields penetrate the body more deeply at lower frequencies. Above 15 GHz the power density limit rises to 10 mW/cm². At 6 GHz the safe limit is 1.2 mW/cm².
Transcribed Image Text:A 6 GHz common-carrier microwave communications link uses a tower-mounted antenna with a gain of 40 dB, and a transmitter power of 5 W. To evaluate the radiation hazard of this system, calculate the power density at a distance of 20 m from the antenna. Do this for a position in the main beam of the antenna, and for a position in the side lobe region of the antenna. Assume a worst-case side lobe level of -10 dB. Note: The recommended safe power density is as low as 0.2 mW/cm² at the lower RF range of around 100 MHz because the fields penetrate the body more deeply at lower frequencies. Above 15 GHz the power density limit rises to 10 mW/cm². At 6 GHz the safe limit is 1.2 mW/cm².
A Tower mounted antenna 20m S = Gt Pt 47 R² Lobe at -10 dB = f = 6GHZ G=40dB P₁ = 5W R= 20m 10 000 x5 47 (201² S: 0.1m w/cm² = 9.947 w/m² 9.947x0³ 104 ≈ /mw/cm² = mW/cm²
Transcribed Image Text:A Tower mounted antenna 20m S = Gt Pt 47 R² Lobe at -10 dB = f = 6GHZ G=40dB P₁ = 5W R= 20m 10 000 x5 47 (201² S: 0.1m w/cm² = 9.947 w/m² 9.947x0³ 104 ≈ /mw/cm² = mW/cm²
Expert Solution
steps

Step by step

Solved in 3 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Star delta conversion
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
  • SEE MORE QUESTIONS
Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Fundamentals of Electric Circuits
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:
9780078028229
Author:
Charles K Alexander, Matthew Sadiku
Publisher:
McGraw-Hill Education
Electric Circuits. (11th Edition)
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:
9780134746968
Author:
James W. Nilsson, Susan Riedel
Publisher:
PEARSON
Engineering Electromagnetics
Engineering Electromagnetics
Electrical Engineering
ISBN:
9780078028151
Author:
Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:
Mcgraw-hill Education,
SEE MORE TEXTBOOKS