# Assgn9 - Assignment #9 1. Design a parabolic antenna for an...

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Assignment #9 1. Design a parabolic antenna for an antenna gain of 6000 at a frequency 6000 MHz. Calculate the beam width between half-power points of this antenna. Assuming 90% antenna efficiency, calculate the power received if the incoming signals have a power density of 1µ W/m2. 2. A paraboloid reflector with diameter 50 meters is used at 1500 MHz. Calculate the beam width and power gain. 3. For a rectangular aperture(a,b) in xy-plane is linearly polarised in y direction and the aperture excitation has a uniform phase and a triangular amplitude distribution F ( x) = 1 − 2 x , x ≤a a Find (i)Pattern function (ii)half power beam width (iii)location of first nulls(cheng:11.34) Assignment 8 November 12, 2009 1. The normalized radiation pattern of uniformly illuminated Circular aperture is given by E (φ) = where J1 is rst order bessel functions D = diameter of aperture λ= free space wavelength φ= angle with respect to normal of the aperture Find (a) rst nulls of radiation pattern (b) HPBW (c) Directivity 2. Four 900 corner reector antennas are arranged in line as a broad side array. The corner edges are parallel and side by side as shown in g. The spacing between the corners is λ. The driven antenna in each corner is λ/2 element spaced 0.4λ from the corner. All antennas are energized in phase and have equal current amplitude. Assuming Radiation intensity of a corner reector is given by E (φ) = 2EHW I1 |[cos(Sr cos(φ) − cos(Sr sin(φ)))]| 2λ J1 [(πD/λ)sinφ] πD sinφ where I1 = current in the element EHW =Electric eld due to half wave dipole (a) Find the gain of the array over a single λ/2 dipole (b) Plot the radiation pattern of the array (c) Half power beam width 3. A circular parabolic dish antenna has an eective apperture of 100m2 . If one 300 sector of parabola is removed, nd the new eective aperture. The rest of the antenna including feed, is unchanged. 1 ...
View Full Document

## This note was uploaded on 09/12/2010 for the course EE EE645 taught by Professor Ujin during the Spring '10 term at YTI Career Institute.

### Page1 / 2

Assgn9 - Assignment #9 1. Design a parabolic antenna for an...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online