Tunable Negative Group Delay of Rectangular Waveguide Based on
Corrugated Tantalum Nitride Slow Wave Structure
Abstract
In this letter, a rectangular waveguide with tunable negative group
delay (NGD) is proposed. Corrugated tantalum nitride (TaN) slow wave
structure is used to generate the NGD response. The NGD value and NGD
center frequency can be adjusted continuously by the corrugation width
and height. The simulation results show that the NGD values of up to
-0.7 ns are potentially available. A prototype of the proposed structure
is fabricated and measured. The measured results show the fabricated
structure is capable of generating up to -0.115 ns group delay at 19.4
to 19.8 GHz which is consistent with simulation predictions. To our best
knowledge, this is the first time that the negative time delay has been
realized at Ka-band in rectangular waveguide.