研究目的
To design a low profile, electrically small Huygens source antenna that radiates at 300 MHz in its broadside direction with high radiation efficiency and a large front-to-back ratio.
研究成果
Two very low profile, broadside radiating, electrically small Huygens source antennas were demonstrated. The integration of their NFRP elements to realize a Huygens source antenna was explained, achieving high radiation efficiency and FTBR values near 300 MHz. The presence of lumped elements in the designs allows for frequency tuning of the individual NFRP elements and the overall antenna.
研究不足
The very small bandwidth of the CLL elements and the need for careful tuning of the design parameters to achieve the desired Huygens source effect.
1：Experimental Design and Method Selection:
The design involves two electrically small, near-field resonant parasitic (NFRP) antennas based on a coax-fed dipole antenna. An electric dipole response is obtained by combining it with a tunable Egyptian axe dipole (EAD) NFRP element, and a magnetic dipole response is obtained by spatially loading the driven dipole with tunable, extruded capacitively loaded loop (CLL) NFRP elements. The driven dipole and the EAD and CLL NFRP elements are combined and retuned to achieve a broadside radiating Huygens source antenna.
2：Sample Selection and Data Sources:
The metal components were taken to be copper, and dielectric materials were Rogers Duroid 5880. The operational frequencies of interest were selected to be near 300 MHz.
3：The operational frequencies of interest were selected to be near 300 MHz.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Copper with εr = 1.0, μr = 0.999991 and bulk conductivity σ = 5.8 × 107S/m; Rogers Duroid 5880 with εr = 2.2, μr = 1.0 and loss tangent tan φ = 0.0009; ANSYS HFSS ver. 14.0 for numerical simulations.
4：0, μr = 999991 and bulk conductivity σ = 8 × 107S/m; Rogers Duroid 5880 with εr = 2, μr = 0 and loss tangent tan φ = 0009; ANSYS HFSS ver. 0 for numerical simulations.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The numerical simulations and their optimizations were carried out using ANSYS HFSS. The design parameters were varied to tune the EAD antenna and subsequent Huygens source antennas.
5：Data Analysis Methods:
The performance characteristics of the antennas were analyzed, including |S11| values, 3D directivity patterns, accepted power, total radiated power, radiation efficiency, maximum directivity, peak realized gain, and 3dB bandwidth.
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