Compact Reconfigurable Planar EBGs Based on Short-Circuited Hairpin Resonators

This work investigates how to develop compact reconfigurable planar corrugations. The proposed structure has a unit cell of a planar horizontal microstrip corrugation with a modified geometry that resembles a hairpin resonator shape. This configuration is especially compact and it may straightforwardly exhibit a reconfigurable frequency of operation. This initial work evaluates the stop-band filtering properties of a few unit cells below a microstrip line as a proof of concept. Varactor diodes have been employed to change the series capacitance of the unit cells, and consequently, to modify the notched bands produced by the periodic structure. The filtering properties are studied only in one direction as required for corrugations.