### Abstract

A model of the input impedance of the toroidal permeable antenna, which is the dual of the conventional metal loop antenna, is derived, starting from Schelkunoff's transmission line description of the loop antenna instead of the electrically small limit model. This antenna operates in both the monopole mode and circularly polarized dipole mode and is constructed from a torus of high permeability material. Since the ultimate goal is to obtain an impedance model from which to derive the best matching network; the input impedance is expressed in a form that has a frequency independent resistor terminating a reactive network which is called the Darlington form. Because such a circuit mimics closely the input impedance of the dipole modes of the spherical mode expansion, it is a much better model of the antennas as we go beyond the electrically small limit. The feed loop contribution is explicitly accounted for and the results are compared with fullwave simulations of a typical toroidal antenna operating in both monopole and circularly polarized dipole modes which show a good agreement well beyond the electrically small limit.

Original language | English (US) |
---|---|

Article number | 8023891 |

Pages (from-to) | 5796-5807 |

Number of pages | 12 |

Journal | IEEE Transactions on Antennas and Propagation |

Volume | 65 |

Issue number | 11 |

DOIs | |

State | Published - Nov 1 2017 |

### Fingerprint

### Keywords

- Conformal antennas
- dual mode antenna
- ferromagnetic materials
- impedance model
- wideband antenna

### ASJC Scopus subject areas

- Electrical and Electronic Engineering

### Cite this

*IEEE Transactions on Antennas and Propagation*,

*65*(11), 5796-5807. [8023891]. https://doi.org/10.1109/TAP.2017.2748184

**A First-Order Model of the Multiple-Feed Toroidal Magneto-Dielectric Antenna.** / Yousefi, Tara; Diaz, Rodolfo.

Research output: Contribution to journal › Article

*IEEE Transactions on Antennas and Propagation*, vol. 65, no. 11, 8023891, pp. 5796-5807. https://doi.org/10.1109/TAP.2017.2748184

}

TY - JOUR

T1 - A First-Order Model of the Multiple-Feed Toroidal Magneto-Dielectric Antenna

AU - Yousefi, Tara

AU - Diaz, Rodolfo

PY - 2017/11/1

Y1 - 2017/11/1

N2 - A model of the input impedance of the toroidal permeable antenna, which is the dual of the conventional metal loop antenna, is derived, starting from Schelkunoff's transmission line description of the loop antenna instead of the electrically small limit model. This antenna operates in both the monopole mode and circularly polarized dipole mode and is constructed from a torus of high permeability material. Since the ultimate goal is to obtain an impedance model from which to derive the best matching network; the input impedance is expressed in a form that has a frequency independent resistor terminating a reactive network which is called the Darlington form. Because such a circuit mimics closely the input impedance of the dipole modes of the spherical mode expansion, it is a much better model of the antennas as we go beyond the electrically small limit. The feed loop contribution is explicitly accounted for and the results are compared with fullwave simulations of a typical toroidal antenna operating in both monopole and circularly polarized dipole modes which show a good agreement well beyond the electrically small limit.

AB - A model of the input impedance of the toroidal permeable antenna, which is the dual of the conventional metal loop antenna, is derived, starting from Schelkunoff's transmission line description of the loop antenna instead of the electrically small limit model. This antenna operates in both the monopole mode and circularly polarized dipole mode and is constructed from a torus of high permeability material. Since the ultimate goal is to obtain an impedance model from which to derive the best matching network; the input impedance is expressed in a form that has a frequency independent resistor terminating a reactive network which is called the Darlington form. Because such a circuit mimics closely the input impedance of the dipole modes of the spherical mode expansion, it is a much better model of the antennas as we go beyond the electrically small limit. The feed loop contribution is explicitly accounted for and the results are compared with fullwave simulations of a typical toroidal antenna operating in both monopole and circularly polarized dipole modes which show a good agreement well beyond the electrically small limit.

KW - Conformal antennas

KW - dual mode antenna

KW - ferromagnetic materials

KW - impedance model

KW - wideband antenna

UR - http://www.scopus.com/inward/record.url?scp=85029147040&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85029147040&partnerID=8YFLogxK

U2 - 10.1109/TAP.2017.2748184

DO - 10.1109/TAP.2017.2748184

M3 - Article

VL - 65

SP - 5796

EP - 5807

JO - IEEE Transactions on Antennas and Propagation

JF - IEEE Transactions on Antennas and Propagation

SN - 0018-926X

IS - 11

M1 - 8023891

ER -