### Abstract

Dual mode horn antenna is widely used in reflector antenna systems to illuminate symmetric E/H-plane radiation patterns to a reflector surface. Symmetric E/H-plane radiation pattern can improve the total gain of the reflector antenna system and allows a design of a reflector to be symmetric [1]. Dual mode horn antenna was developed by Potter [2] and many designs have been proposed to have symmetric E/H-plane radiation pattern [3]-[7]. The mode at the aperture of the dual mode horn antenna is hybrid mode (HE_{11} mode) which consists of approximately 85% of TE_{11} mode and 15% of TM _{11} mode [8] and the antenna radiates gaussian-like beam pattern, and therefore the E/H-plane radiation patterns are symmetric ideally. However, if the aperture size of a dual mode horn antenna is increased to attain the desired gain or beamwidth for the reflector antenna system, ideal HE_{11} mode is difficult to be attained at the aperture because undesired high order modes which lead asymmetric E/H-plane radiation patterns are generated. In this paper, modified dual mode horn antenna with rectangular aperture is proposed to improve the E/H-plane radiation pattern symmetry in oversized aperture horn. Simulation and experimental results show that the proposed dual mode horn antenna has the improved E/H-plane radiation pattern symmetry compared to a conventional circular dual mode horn antenna.

Original language | English |
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Title of host publication | Conference Proceedings of the 2012 International Symposium on Antennas and Propagation, ISAP 2012 |

Pages | 547-550 |

Number of pages | 4 |

Publication status | Published - 2012 Dec 1 |

Event | 2012 17th International Symposium on Antennas and Propagation, ISAP 2012 - Nagoya, Japan Duration: 2012 Oct 29 → 2012 Nov 2 |

### Publication series

Name | IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) |
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ISSN (Print) | 1522-3965 |

### Other

Other | 2012 17th International Symposium on Antennas and Propagation, ISAP 2012 |
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Country | Japan |

City | Nagoya |

Period | 12/10/29 → 12/11/2 |

### All Science Journal Classification (ASJC) codes

- Electrical and Electronic Engineering

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## Cite this

*Conference Proceedings of the 2012 International Symposium on Antennas and Propagation, ISAP 2012*(pp. 547-550). [6393999] (IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)).