The History of the Development of the Dielectric Resonator Antenna
The History of the Development of the Dielectric Resonator Antenna
The History of the Development of the Dielectric Resonator Antenna
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8) More recent work at <strong>the</strong> University <strong>of</strong> HoustonUniversity <strong>of</strong>Houston• Stacked Embedded DRA – Andrew Walsh, AWPL, 2006250-20Input Reflection Coefficient (dB)20-10Bandwidth (%)1510ε r.upper = 15.2ε r.lower = 6.0-30a = 68.1 %b = 50.7 %c = 59.9 %d = 21.0 %5-4000 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1dlower/d (unitless)Stacked DRAHomogeneous DRAFigure 3. Percent bandwidth vs variation in height <strong>of</strong> <strong>the</strong>lower section <strong>of</strong> <strong>the</strong> DRA, <strong>the</strong> permittivity <strong>of</strong> <strong>the</strong> top andbottom sections are fixed at 15.2 and 6.0 respectively-502.5 3 3.5 4 4.5 5Frequency (GHz)(a) Embedded Stacked DRA(c) Stacked DRA(b) Core-Plug Embedded DRA(d) Homogeneous DRAFigure 8. Reflection coefficient for antennas previouslyshown in Figure 7 with <strong>the</strong> corresponding percent bandwidthICEEA '07 -- Sept 20, 2007 46
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