Directivity characteristics and radiation impedance of a circular frame placed around a cylinder of perfect conductivity

Authors

  • G. A. Evstropov SC NPK NIIDAR, Russian Federation
  • A. I. Klimenko Research Institute of Long-Distance Radio Communication, Russian Federation

DOI:

https://doi.org/10.1109/ICATT.1999.1236206

Abstract

Circular, rhombic, square and rectangular loop antennas are widely used in practice, especially as receiving TV antennas [1–3]. The radiation impedance of a circular loop antenna is equal to 132 Ω, whereas the impedance of a square antenna is 122 Ω. This matches quite well a 75-Ω cable and allows one to use a double loop (z-antennas for TV program reception). When using square loop antennas with sides a and b, it is possible to change the radiation impedance and, as a consequence, the input impedance in the wide range from 30 Ω to 300 Ω. When the height of the loop is small (small values of b), the antenna becomes a folded dipole antenna. The polarization of the loop antenna radiation in the principal planes coincides with the direction of the electrical field at the input terminals.

References

Rothammel, Karl. Antennas. Moscow: Boyanich, Sanct-Peterburg, 1998, 650 p. [in Russian].

Kharchenko, K. YKV Antennas. Moscow: DOSAAF, 1969, 110 p. [in Russian].

Sidorow, I.N. Televizionnis Antennas. Sanct-Peterburg: Lenizdat, 1996 [in Russian].

Spravochnic po Antennoi Tekhnice, Vol. 1. Moscow: Padiotekhnica, 1997, 249 p. [in Russian].

ICATT 1999 cover

Published

1999-09-14

Issue

1999: ICATT’99 - Proc. of III Int. Conf. on Antenna Theory and Techniques

Section

LGA, printed antennas