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