Current Distribution and Input Impedance of a Loop Antenna in a Cold Magnetoplasma

Current Distribution and Input Impedance of a Strip Loop Antenna Located on the Surface of a Circular Column Filled With a Resonant Magnetoplasma

“…It is evident that the dependences |I Σ (φ)/I Σmax | and θ(φ) for the antenna located on the surface of a resonant plasma column qualitatively resemble the corresponding distributions for a loop antenna in a homogeneous magnetoplasma with appropriate parameters [10]. If the antenna of the same radius were located in free space, it would have a quasi-uniform current distribution.…”

“…In the opposite case |εη| 1/2 ε a , we obtain h = k 0 (1 − i)|εη| 1/4 /2, which is a factor of √ 2 smaller than the corresponding quantity for a loop antenna in a resonant homogeneous magnetoplasma (see [10]). …”

“…A closed-form expression for the current distribution can be derived if the strip is so narrow that the inequality ln(4a/d) |S m | is valid for |m| <m. Then, neglecting S m and making steps similar to those performed in [10], we deduce…”

“…In most papers on the subject, dipole and loop antennas in a homogeneous plasma medium are considered [1][2][3][4][5][6][7][8][9][10]. By resonant magnetoplasma, we mean a cold, collisionless magnetized plasma in which the refractive index of one of the characteristic waves tends to infinity when an angle between the wave normal direction and an external dc magnetic field approaches a certain value determined by the plasma parameters.…”

“…By resonant magnetoplasma, we mean a cold, collisionless magnetized plasma in which the refractive index of one of the characteristic waves tends to infinity when an angle between the wave normal direction and an external dc magnetic field approaches a certain value determined by the plasma parameters. In this case, the classical thin-antenna theory cannot be employed readily since no matter how small the cross section of the antenna wire might be physically, it is always possible to find some wave normal direction for which one wavelength in the plasma medium will become less than the wire cross-sectional extent and the antenna conductor will appear to be "thick" [2,3,9,10].…”