What is the area of a receiving antennae with an angular spread of θ = λ/d?

  • Thread starter Thread starter Biosyn
  • Start date Start date
  • Tags Tags
    Angular
Click For Summary
SUMMARY

The area of a receiving antenna with an angular spread defined by θ = λ/d can be approximated using the given parameters: λ = 5*10^-2 m and d = 3*10^3 m. The calculated angular spread θ results in a spatial spread S of approximately 1 km. The area is derived from the formula A = (S/2)^2 * π, yielding an area of about 0.54 km², indicating a discrepancy in the initial rough approximation of 1 km. This discussion highlights the importance of precise calculations in antenna area determination.

PREREQUISITES
  • Understanding of antenna theory and beamwidth calculations
  • Familiarity with angular measurements and their applications in physics
  • Basic knowledge of mathematical formulas for area calculation
  • Proficiency in unit conversions, particularly between meters and kilometers
NEXT STEPS
  • Study the derivation of the angular spread formula θ = λ/d in antenna theory
  • Learn about beamwidth and its impact on antenna performance
  • Explore advanced antenna design techniques for optimizing area and coverage
  • Investigate the implications of spatial spread on signal reception quality
USEFUL FOR

Students in physics or engineering, antenna designers, and professionals involved in telecommunications who require a deeper understanding of antenna area calculations and their practical applications.

Biosyn
Messages
114
Reaction score
0

Homework Statement



I just have a question on finding the area of a receiving antennae. The answer says the area is about 1km. I got an answer close to 1 km.

λ = 5*10-2 m
d = 3*103 m

The angular spread is θ = λ/d

θ= [itex]\frac{5*10<sup>-2</sup>}{3*10<sup>3</sup>}[/itex]

The spatial spread is the diameter of the beam on the target. So that means it is the angular spread times the distance the beam travels. Correct?

S = r*θ
S = (5*10^7 m ) * θ
S ≈ 1 km The area of the receiving antennae is them [1km / 2 ]2 * ∏ = 0.78km which is about 1 km.
 
Physics news on Phys.org
The S ≈ 1 km approximation is rather rough. 830m is closer, and that leads to a final answer of about .54 km2 (note: km2, not km). This suggests you have an error somewhere else, but I'm not qualified to say where.
 

Similar threads

Replies
4
Views
2K
  • · Replies 6 ·
Replies
6
Views
1K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
8K
  • · Replies 2 ·
Replies
2
Views
4K
Replies
2
Views
2K