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. Author manuscript; available in PMC: 2011 Apr 19.
Published in final edited form as: Phys Rev Lett. 2010 Sep 20;105(13):135101. doi: 10.1103/PhysRevLett.105.135101

FIG. 4.

FIG. 4

(color online). Measured (dots) and calculated (solid line) transit time delay of 500 ps pulses in (a) 10 cm-long WR4 waveguide with a cutoff frequency of 139.25 GHz and (b) the 28.4 cm gyro-TWT confocal waveguide structure with a cutoff frequency of 135.0 ± 0.3 GHz.