Dispersive Delay Line With Large Group Delay Using Deformed Open Stub and its Complementary Slot Line

A deformed open stub and its non-coplanar complementary slot line are employed to implement a dispersive delay line (DDL) with all-pass response and excessive group delay. The maximum group delay occurring in the deformed stub-line/slot-line configuration is 0.8 ns at 2.5 GHz which is 60% more than the maximum group delay obtained in the conventional open-stub/slot-line configuration. Measured and simulation results of group delay are presented to show the versatility of the novel dispersive structure.