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A metamaterial antenna with frequency-scanning omnidirectional radiation patterns
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View: Figures


Image of FIG. 1.
FIG. 1.

Layout and corresponding equivalent circuit model of the 2D TL MTM element. (a) Perspective view; (b) top and bottom view; and (c) equivalent circuit model. The capacitive gap is etched on the low-impedance conductor strip (depicted in blue) beneath which, the CSRRs (depicted in dark) are etched on the ground plane (depicted in grey). The geometrical parameters are listed in millimeters (mm): d 1 = d 2 = d 3 = d 4= 0.2, a = b = 4.8, c = 3.6, w = 2.6, and px  = py  = 20.

Image of FIG. 2.
FIG. 2.

(a) Extracted lumped elements and (b) simulated S-parameters of the 1D TL MTM cell. The circuit elements are extracted as Ls  = 2.57nH, Cg  = 0.32 pF, C = 2.903 pF, Cp  = 3.34 pF, and Lp = 0.39 nH at 6 GHz.

Image of FIG. 3.
FIG. 3.

Dispersion diagram of the proposed 2D TL MTM cell obtained from the (a) eigenmode analysis and TL theory as well as (b) full-wave S-parameters.

Image of FIG. 4.
FIG. 4.

Manufactured prototypes of the proposed MTM antennas. (a) 5 × 1 array; (b) 3 × 3 array.

Image of FIG. 5.
FIG. 5.

Simulated and measured S-parameters of the proposed (a) 5 × 1 MTM array and (b) 3 × 3 MTM array.

Image of FIG. 6.
FIG. 6.

Computed 3D and E-plane (xoz plane) radiation patterns of the proposed (a)-(d) 5 × 1 and (e)-(h) 3 × 3 MTM array at different frequencies. (a)-(c) are for the 3D patterns operating at 4.4, 4.5, and 4.64 GHz, respectively, (e)–(g) are for the 3D patterns operating at 4.42, 4.46 and, 4.54 GHz, respectively, and (d), (h) are for the E-plane patterns.

Image of FIG. 7.
FIG. 7.

Measured (a)–(b) E-plane and (c)–(d) H-plane radiation patterns for the 5 × 1 array at (a), (c) 4.5 GHz and (b), (d) 4.6 GHz, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A metamaterial antenna with frequency-scanning omnidirectional radiation patterns