Investigation on Harmonic Tuning for Active Ku-Band Rectangular Dielectric Resonator Antennas

Figure 4

Real and imaginary values of the DRA input impedance at the second and third harmonic frequencies versus length-to-height ratio, for two values of the resonator length: (a) 𝑎=3.85mm and (b) 𝑎=4.25mm.

(a)

(b)