Title :
A fully distributed heterostructure-barrier varactor nonlinear transmission-line frequency multiplier and pulse sharpener
Author :
Li, Ming ; Krishnamurthi, Kathiravan ; Harrison, Robert G.
Author_Institution :
Dept. of Electron., Carleton Univ., Ottawa, Ont., Canada
fDate :
12/1/1998 12:00:00 AM
Abstract :
The discrete symmetric heterostructure-barrier varactor (HBV) was previously developed as an unbiased frequency-tripling device that needed no second-harmonic idler circuit. Other work investigated nonlinear transmission lines (NLTLs) employing discrete varactors attached to linear guiding structures. Fully distributed Schottky-varactor NLTLs were excessively lossy. This paper explores NLTLs based on fully distributed HBV structures. Using both a modified finite-difference time-domain method and numerical integration, it is shown that such NLTL´s can provide efficient tripling over a wider input bandwidth than is possible with fixed-tuned triplers. It is also demonstrated that the nonlinearity is strong enough for the NLTL to act as a pulse-sharpening device
Keywords :
distributed parameter networks; equivalent circuits; finite difference time-domain analysis; frequency multipliers; integration; millimetre wave diodes; millimetre wave frequency convertors; pulse shaping circuits; semiconductor device models; transient analysis; transmission line theory; varactors; wave equations; finite-difference time-domain method; frequency multiplier; frequency-tripling device; fully distributed HBV structures; heterostructure-barrier varactor; input bandwidth; modified FDTD method; nonlinear transmission-line; numerical integration; pulse sharpener; Capacitance; Circuits; Finite difference methods; Frequency; Partial differential equations; Power generation; Power transmission lines; Time domain analysis; Transmission lines; Varactors;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
