Figure 3 Variation of resonance frequency as field moves from transverse ࡗ to longitudinal direction ଙ of wave propagation for different strengths tunability is obtained on a polycrystalline ferrite substrate, which is much less expensive compared to a single crystal of YIG substrate. These resonators are more useful in microwave devices such as tunable filters and tunable oscillators because of their low cost.
ABSTRACT:A novel structure of tapered slotline antenna is presented. Using "palm tree" shaped metallization cross-polarization levels are improved. Also their influence on radiation pattern is considered. Matching performance is at least as good as a simple exponential tapered slotline (Vivaldi) antenna. Frequency coverage for return loss Ͻ Ϫ10 dB exceeded and measured gain reached values higher than 6 dB from 5 to 15 GHz. Radiation pattern is stable from 6 GHz to 12 GHz and cross-polarization is below Ϫ20 dB for the 3-11 GHz band in the main direction.
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