Continuously Frequency-Tunable Horn Filtennas Based on Dual-Post Resonators

Figure 9

Millimeter-wave horn filtenna reflection coefficient. Conf. I (d₁ = 2.55 mm and d₂ = 0 mm) centered at 17.4 GHz; Conf. II (d₁ = 0.85 mm and d₂ = 1.8 mm) centered at 21 GHz; Conf. III (d₁ = 0.5 mm and d₂ = 1 mm) centered at 24 GHz.