Introduction to Horn Antennas

1. Introduction toHorn Antennas

2. Introduction Horn Antennas : • flared waveguides that produce a nearly uniform phase front larger than the waveguide itself • constructed in a variety of shapes such as sectoral E-plane, sectoral H-plane, pyramidal, conical, etc.

3. Application Areas • used as a feed element for large radio astronomy, satellite tracking and communication dishes • A common element of phased arrays • used in the calibration, other high-gain antennas • used for making electromagnetic interference measurements

4. E-plane Sectoral Horn • Fields expressions OVER THE hornare similar to the fields of a TE10 mode for a rectangular waveguide with the aperture dimensions of a and b1. • difference is in the complex exponential term, parabolic phase error,.

5. E- and H-Plane Patterns of the E-Plane Sectoral Horn E-Plane H-Plane

6. E- and H-Plane Patterns of the H-Plane Sectoral Horn E-Plane H-Plane

7. E and H-Plane Patterns E-Plane H-Plane )

8. E- and H-Plane Patterns of The Conical Horn Antenna E-Plane H-Plane

9. Pyramidal Horn • combination of the E-plane and H-plane horns and as such is flared in both directions

10. Other horn antenna types • Multimode Horns • Corrugated Horns • Hog Horns • Biconical Horns • Dielectric Loaded Horns etc.

11. References • A.W. LOVE “The Diagonal Horn Antennas” microwave J., Vol. V,pp. 117-122, Mar. 1962 • Constantine A. Balanis, ‘Antenna Theory, Analysis and Design’ 2nd Ed., Wiley,1997 • D.M Pozar, ‘Directivity of Omnidirectional Antennas’ 1993 • R.E Collin, ‘Antennas and Radiowave Propagation’ McGraw- Hill , 1985* • Samuel Silver, ‘Microwave Antenna Theory And Design’ McGraw- Hill , 1949