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Efficient, High Directivity, Large Front-to-Back-Ratio, Electrically Small, Near-Field-Resonant-Parasitic Antenna

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2 Author(s)
Ming-Chun Tang ; Inst. of Appl. Phys., Univ. of Electron. Sci. & Technol. of China, Chengdu, China ; Ziolkowski, R.W.

Enhancements of the directivity and front-to-back ratio (FTBR) of a metamaterial-inspired electrically small, linearly polarized, coaxially-fed Egyptian axe dipole antenna are considered. They are accomplished with a particular augmentation of the original near-field-resonant-parasitic (NFRP) antenna with an additional NFRP element, a small disc conductor modified with two meanderline-shaped slots. The entire system is evaluated numerically with two independent computational electromagnetics simulators. The optimized results demonstrate an electrically small antenna (i.e., ka <; 1.0) with a reasonably low profile (i.e., height ~ λ/10) that improves the directivity from 1.77 to 6.32 dB, increases the FTBR from 0 to > 20 dB, and maintains large half-power beamwidths, while having a radiation efficiency over 80% with nearly complete matching to a 50 Ω source.

The EAD antenna integrated with the slot-modified, parasitic copper disc ¿¿ 3D view. The EAD antenna integrated with the slot-modified, parasitic copper disc ¿¿ 3D view.

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Access, IEEE  (Volume:1 )
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