Abstract
With increasing frequencies the whisker structures used to contact honeycomb Schottky diodes remain no longer thin compared to wavelength. Whereas the finite thickness and the detailed tip shape do not influence the antenna pattern very much the antenna base impedance depends on these parameters to a great extent. A good impedance matching between Schottky diode and whisker antenna is necessary to optimise mixer or detector performance and can only be achieved if the antenna impedance is known.
Antenna base impedances have been simulated numerically and checked by means of scaled model measurements for several whisker shapes. The influence of further parts of the antenna environment, as for example reflectors, has also been investigated. Simulation results have been discussed and compared to theory. Simulation has been found out to be a reliable tool for the determination of base impedances of almost arbitrarily shaped whisker antennas.
Similar content being viewed by others
References
C. M. Mann, T. Suzuki, J. J. Chang, T. Nozokido, K. Mizuno. Measurement and Study of the Embedding Impedance Presented by the Whisker Antenna of a Schottky Diode Corner Cube Mixer. International Journal of Infrared and Millimeter Waves, 15(11):1867–1881, 1994.
G. Sinclair. Theory of Models of Electromagnetic Systems. Proceedings of the I.R.E., pages 1364–1371, 1948.
R. E. Collin. Antennas and Radiowave Propagation. McGraw-Hill Book Company, New York, 1985.
K. Herrmann. Untersuchungen zum Submillimeterwellen-Empfang 600 GHz mit dem system Whisker-Antenne/Scholtky-Diode. Dissertation, Lehrstuhl für Hochfrequenztechnik, Universität Erlangen-Nürnberg, Erlangen, 1984.
J. Brune. Polarimetrische Reflektometrie im Terahertzbereich. Dissertation, Lehrstuhl für Hochfrequenztechnik, Universität Erlangen-Nürnberg, Erlangen, 1995.
B. Vowinkel. The Main Beam Efficiency of Corner Cube Reflectors. International Journal of Infrared and Millimeter Waves, 7(1):155–169, 1986.
K. Huber, R. Hillermeier, H. Brand, C. I. Lin, A. Simon, M. Rodriguez-Girones, H. L. Hartnagel. 2.5 THz Corner Cube Mixer with Substrateless Schottky Diodes. In Proceedings of the 5th International Workshop on Terahertz Electronics, Grenoble, France, September 1997.
Meinke, Gundlach. Taschenbuch der Hochfrequenztechnik, volume 2. Springer-Verlag, Berlin, 1992.
J. C. Bolomey, J. Cashman, S. El Habiby, D. Lesselier. Conical Antennas as Coupling Structures for Microwave and Infrared Devices. International Journal of Infrared and Millimeter Waves, 2(4):859–876, 1981.
J. C. Bolomey, S. El Habiby. On the Electromagnetic Effective Length of Whisker Structures for IR Diodes at 10.6 μm. International Journal of Infrared and Millimeter Waves, 2(5):541–558, 1981.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Huber, K., Rehm, G. & Richt, N. Numerical Simulation of the Base Impedance of Long Wire Whisker Antennas. International Journal of Infrared and Millimeter Waves 20, 265–278 (1999). https://doi.org/10.1023/A:1021719921321
Issue Date:
DOI: https://doi.org/10.1023/A:1021719921321