Impedance of a Large Circular Loop Antenna in a Magnetoplasma

Shigeo Ohnuki, Kunio Sawaya, Saburo Adachi

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The input impedance of a large circular loop antenna with arbitrary orientation in a cold magnetoplasma is calculated by using a transmission line theory. New impedance resonances for antennas of finite size in a magnetoplasma in the frequency region below and near the electron cyclotron frequency are indicated theoretically. The resonance peak of the impedance at the lower hybrid resonance frequency is also predicted to exist for arbitrarily oriented antennas of finite size. The experiments on the impedance of a large circular loop antenna are carried out for the cases of normal and parallel orientation of the magnetic field with respect to the plane of the loop immersed in a radio frequency-generated laboratory plasma. The newly predicted impedance resonances for the antenna of finite size are observed. It is also shown that the measured impedances agree fairly well with the calculated ones.

Original languageEnglish
Pages (from-to)1024-1029
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number8
Publication statusPublished - 1986 Aug
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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