On the effect of IF power nulls in Schottky diode harmonic mixers

Experimental results reveal the existence of a null in the IF output power for certain bias voltage levels in single Schottky diode harmonic mixers at terahertz frequencies. This dramatic loss of IF power is due to a drastic increase of conversion loss and is governed by intrinsic diode parameters,...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2002-01, Vol.50 (1), p.134-142
Main Authors: Feinaugle, R., Hubers, H.-W., Roser, H.P., Hesler, J.L.
Format: Article
Language:English
Subjects:
Conversion
Diodes
Electric potential
Frequency conversion
Harmonic analysis
Harmonics
Intermediate frequency
Local oscillators
Mixers
Power generation
Power system harmonics
Radio frequencies
Radio frequency
Schottky diodes
Terahertz frequencies
Voltage
Voltage-controlled oscillators
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Summary:Experimental results reveal the existence of a null in the IF output power for certain bias voltage levels in single Schottky diode harmonic mixers at terahertz frequencies. This dramatic loss of IF power is due to a drastic increase of conversion loss and is governed by intrinsic diode parameters, as well as external parameters. For a second harmonic mixer, this is due to a competition of two mixing paths; one is the mixing of the RF with the doubled local oscillator (LO) frequency and the other a mixing of the RF with the LO to an LO sideband followed by a second mixing with the LO, both leading to the IF. In this paper, we present a systematic investigation of and some basic relations between these parameters and the depth and voltage levels where the conversion loss increases. Good agreement is obtained between a simple analysis and the experimental data on second and fourth harmonic mixers.
ISSN:0018-9480
1557-9670
DOI:10.1109/22.981257