### Abstract

A tangential electric field equation for a wire antenna on a dielectric half-space of relative permittivity ε_{r} is formulated using a finite-difference technique. This equation involves only single-integral calculations and is used to obtain the current distribution of a square spiral antenna. The validity of the current obtained is checked by FD-TD analysis. Based on the current distribution obtained, the radiation characteristics of the spiral are evaluated. It is found that the gain in the dielectric material is larger than that in free space, with a ratio of ε_{r}^{1.5} in the broadside directions. As ε_{r} increases, the circularly polarised radiation region bounded by the critical angles in the dielectric becomes narrower and the resistance value of the input impedance becomes lower.

Original language | English |
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Pages (from-to) | 70-74 |

Number of pages | 5 |

Journal | IEE Proceedings: Microwaves, Antennas and Propagation |

Volume | 145 |

Issue number | 1 |

DOIs | |

Publication status | Published - 1998 |

### Keywords

- Finite-difference technique
- Spiral antennas

### ASJC Scopus subject areas

- Computer Networks and Communications
- Electrical and Electronic Engineering

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## Cite this

*IEE Proceedings: Microwaves, Antennas and Propagation*,

*145*(1), 70-74. https://doi.org/10.1049/ip-map:19981446