研究目的
To design a conformal permeable toroidal antenna operating in both a vertically polarized monopole mode and circularly polarized (CP) dipole mode in the UHF frequency range, using advanced ferromagnetic laminate composite materials.
研究成果
A permeable toroidal magnetic flux channel antenna less than 2 cm thick and of 43 cm outer diameter fed by a mode-former designed to operate from 200 to 400 MHz attains a measured gain ranging from 3 to 2 dBi through at least 500 MHz. If high-performance tailor-made components were used, an additional 2 dB increase in gain is plausible.
研究不足
The presence of excess dielectrics used as a hub and capture ring that keep the wound-up laminated ferromagnetic material core in place, and the higher-order wave phenomena supported by the ferromagnetic core when its cross section is comparable to the wavelength.
1：Experimental Design and Method Selection:
The antenna was designed based on the theory of magneto-dielectric radiators and fabricated using a new advanced ferromagnetic laminate composite material.
2：Sample Selection and Data Sources:
The antenna was fabricated and tested, with performance measured in an anechoic chamber.
3：List of Experimental Equipment and Materials:
The antenna was fabricated using cobalt-zirconium-niobium (CoZrNb) ferromagnetic alloy deposited onto 12-μm-thick polyimide film.
4：Experimental Procedures and Operational Workflow:
The antenna was fed by four quadrant feeds, with control of the feeds' amplitudes and phases enabling the excitation of different modes.
5：Data Analysis Methods:
The performance of the antenna was analyzed based on the measured data and compared with full-wave computational electromagnetics (CEM) model results.
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