Abstract
This theoretical study presents the characteristics of plasma monopole antennas in the VHF/UHF range using finite difference time domain (FDTD) simulation. Results show that more broadband characteristics can be obtained by increasing the diameter of the plasma tube and that the minor lobes diminish in intensity as diameter increases. Furthermore, the nulls are replaced by low level radiation. Since the collision frequency, which is a function of gas pressure, represents the loss mechanism of plasma, decreasing its value increases the gain and radar cross section (RCS) of the antenna. Theoretical modeling shows that at higher plasma frequencies with respect to the signal frequency, the gain and radar cross section of the plasma antenna are high enough and that the impedance curves are altered as the plasma frequency varies. Using these preliminary studies, mutual impedance and gain of a broadside array of two parallel side-by-side plasma elements is presented.
Highlights
Plasma antennas represent a completely new class of antennas which employ ionized gas enclosed in a tube as the conducting element of the antenna
In the first part of this paper, the radiation characteristics of a surface wave driven (SWD) plasma monopole antenna are examined, considering the effects of variations of plasma frequency, collision frequency and radius of the tube on the gain, efficiency, input impedance and radar cross section (RCS) of the antenna, because few studies are reported in this regard [4,5]
When the plasma frequency is large enough with respect to the excitation frequency, the imaginary part of the input impedance of plasma antenna can be eliminated by making the total length L of the antenna less than λ 4, where λ is the wavelength
Summary
Abstract—This theoretical study presents the characteristics of plasma monopole antennas in the VHF/UHF range using finite difference time domain (FDTD) simulation. Theoretical modeling shows that at higher plasma frequencies with respect to the signal frequency, the gain and radar cross section of the plasma antenna are high enough and that the impedance curves are altered as the plasma frequency varies. Using these preliminary studies, mutual impedance and gain of a broadside array of two parallel side-byside plasma elements is presented
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