</table>
To excite the coaxial probe in [[EM.Tempo]], it is extended downward by a length L<sub>f</sub> = 15mm. A coaxial port is placed at the bottom of the coaxial feed line. Figure 27 shows the computed return loss (|S11|) of the probe-fed spherical dielectric resonator antenna simulated by EM.Tempo. Figure 28 shows the real and imaginary parts of the input impedance of the same antenna simulated by [[EM.Tempo]] and compares them with the measured data given by Ref. [8]. According to the analysis presented in Ref. [8], this particular DRA excites the TM<sub>101</sub> and TE<sub>221</sub> modes with very close resonant frequencies of 5.245GHz and 5.267GHz, respectively. Figure 28 29 shows the 3D far field radiation pattern of this spherical DRA at f = 4.5GHz.
<table>
<tr>
<td>
[[Image:ART DRA56.png|thumb|left|550px|Figure 27: Real and imaginary parts of the input impedance Return loss of the coaxial-fed dielectric resonator antenna of Figure 39, solid red line: [[EM.Tempo]] (FDTD) results for input resistance, solid blue line: [[EM.Tempo]] (FDTD) results for input reactance, red symbols: measured data given by Ref. [8] for input resistance, and blue symbols: measured data given by Ref. [8] for input reactance26.]]
</td>
</tr>
<tr>
<td>
[[Image:ART DRA57.png|thumb|left|640px550px|Figure 28: Real and imaginary parts of the input impedance of the dielectric resonator antenna of Figure 26, solid red line: [[EM.Tempo]] (FDTD) results for input resistance, solid blue line: [[EM.Tempo]] (FDTD) results for input reactance, red symbols: measured data given by Ref. [8] for input resistance, and blue symbols: measured data given by Ref. [8] for input reactance.]]</td></tr></table> <table><tr><td>[[Image:ART DRA58.png|thumb|left|640px|Figure 29: 3D far field radiation pattern of the spherical DRA with the coaxial feed computed at f = 4.5GHz by [[EM.Tempo]].]]
</td>
</tr>