1 / 14

Aperture Antennas

Aperture Antennas. INEL 5305 Prof. Sandra Cruz-Pol ECE, UPRM. Ref. Balanis Chpt. 12. Aperture Antennas. Most common at microwave frequencies Can be flushed-mounted We will analyze radiation characteristics at far field Rectangular aperture Circular aperture.

aure
Download Presentation

Aperture Antennas

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Aperture Antennas INEL 5305 Prof. Sandra Cruz-Pol ECE, UPRM Ref. Balanis Chpt. 12

  2. Aperture Antennas • Most common at microwave frequencies • Can be flushed-mounted • We will analyze radiation characteristics at far field • Rectangular aperture • Circular aperture

  3. Far field is the F of the near field t f • Fourier Transform for 1-D • For two-dimensions, x and y;

  4. Properties of Fourier Transform

  5. Taking the Fourier transform of the 2 equations above:

  6. Now, we define, And we obtain, Which has a solution of Then we take the inverse transform

  7. If z=0, then, we are at the aperture Which looks like: Which is the inverse of F…

  8. This is the Fourier transform for 2 dimensions, so: It can be shown that, Therefore, if we know the field at the aperture, we can used these equations to find E(r). =>First, we’ll look at the case when the illumination at the rectangular aperture it’s uniform.

  9. Uniformly illuminated rectangular aperture *Note: in Balanis book, the aperture is axb, so no 4 factor on the eq. above.

  10. How does this pattern looks…

  11. TE10 illuminated rectangular aperture

  12. Rectangular Aperture:Directivity • For TE10 illuminated Rectangular Aperture the aperture efficiency is around 81%. • For the uniform illumination, is 100% but in practice difficult to implement uniform illumination.

  13. Circular Aperture (Uniform illumination) • In this case we use cylindrical coordinates

  14. Circular Aperture w/ uniform illumination • For TE11 illuminated Circular Aperture the aperture efficiency is around 84%. • For the uniform illumination, is 100% but in practice difficult to implement uniformity

More Related