Skip to main content Accessibility help
×
Home

Correlation-based analysis of mode converters in multimode waveguides

  • Ivan Russo (a1), Winfried Mayer (a2), Stefan Pflueger (a3) and Wolfgang Menzel (a4)

Abstract

In this work, a novel method for the mode content extrapolation in multimode waveguides with focus on the characterization of mode converters is presented. The proposed method is based on the direct determination of the correlation coefficients between the structural functions of all possible propagating modes and the complex measured near-field pattern. To implement the method, standard near-field equipment is simply required. Test simulations and measurements from 4 to 8 GHz on a 6-in. circular pipe for radar level monitoring are reported in the last section and demonstrate that the proposed technique provides accurate information about the mode content of the structure under test.

Copyright

Corresponding author

Corresponding author: I. Russo Email: ivan.russo@tugraz.at

References

Hide All
[1]Kielb, J.A.; Pulkrabek, M.O.: Application of a 25 GHz FMCW radar for industrial control and process level measurement, in IEEE MTT-S Int. Microwave Symp., vol. 1, Anaheim, CA, 1999, 281284.
[2]Pohl, N.; Gerding, M.; Will, B.; Musch, T.; Hausner, J.; Schiek, B.: High precision radar distance measurements in overmoded circular waveguides. IEEE Trans. Microw. Theory Techn., 55 (6) (2007), 13741381.
[3]Armbrecht, G.; Denicke, E.; Pohl, N.; Musch, T.; Rolfes, I.: Obstacle based concept for compact mode-preserving waveguide transitions for high-precision radar level measurements, in 38th European Microwave Conf., EuMC, Amsterdam, NL, 2008, 472475.
[4]Forrer, M.P.; Tomiyasu, K.: Determination of higher order propagating modes in wave-guide systems. J. Appl. Phys., 29 (7) (1958), 10401045.
[5]Price, V.G.: Measurement of harmonic power generated by microwave transmitters. IRE Trans. Microw. Theory Techn., 7 (1) (1959), 116120.
[6]Levinson, D.S.; Rubinstein, I.: A technique for measuring individual modes propagating in overmoded waveguides. IEEE Trans. Microw. Theory Techn., 14 (7) (1966), 310322.
[7]Johnston, R.H.: Measurement of modes in an overmoded circular waveguide, in Proc. 40th Midwest Symp. on Circuits and Systems, vol. 1, Sacramento, CA, US, 1997, 599602.
[8]Baird, J.M.; Roper, D.H.; Grow, R.W.: Surface array waveguide mode analyzer, in IEEE MTT-S Int. Microwave Symp., Albuquerque, NM, US, 1992, 137140.
[9]Beck, A.C.: Measurement techniques for multimode waveguides. IRE Trans. Microw. Theory Techn., 3 (3) (1955), 3541.
[10]Lewis, D.J.: Mode couplers and multimode measurement techniques. IRE Trans. Microw. Theory Techn., 7 (1) (1959), 110116.
[11]Lorbeck, J.A.; Vernon, R.J.: Determination of mode content and relative phase in highly overmoded circular waveguides by open-ended radiation pattern measurement, in Antennas and Propagation Society Int. Symp., AP-S 1989, vol. 3, San Jose, CA, US, 1989, 12511254.
[12]Idei, H.; Shapiro, M.A.; Temkin, R.J.; Shimozuma, T.; Kubo, S.: Mode retrieval from intensity profile measurements using irradiant waveguide-modes, in 34th Int. Conf. on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2009, Busan, KR, 2009.
[13]Kasparek, W.; Müller, G.A.: The wavenumber spectrometer – an alternative to the directional coupler for multimode analysis in oversized waveguides. Int. J. Electron., 64 (1) (1988), 520.
[14]Mahler, W.: Surveillance of the spectral purity in overmoded waveguides, in Asia-Pacific Microwave Conf., APMC 2008, New Delhi, IN, 2008.
[15]Mitrofanov, O.; Tan, T.; Mark, P.R.; Bowden, B.; Harrington, J.A.: Waveguide mode imaging and dispersion analysis with terahertz near-field microscopy. Appl. Phys. Lett., 94 (17) (2009), 171104.
[16]Klinger, Y.: The measurement of spurious modes in over-moded waveguides. Proc. IEE – B: Electron. Commun. Eng., 106 (13) (1959), 8993.
[17]Nikitin, P.V.; Stancil, D.D.; Cepni, A.G.; Xhafa, A.E.; Tonguz, O.K.; Brodtkorb, D.: A novel mode content analysis technique for antennas in multimode waveguides. IEEE Trans. Microw. Theory Techn., 51 (12) (2003), 24022408.
[18]Collin, R.E.: Foundations for Microwave Engineering, 2nd ed., Wiley–IEEE Press, 2000, Hoboken, New Jersey, 194197.
[19]The Mathworks, Matlab.
[20]Russo, I.; Menzel, W.: 4–8 GHz near-field probe for scanning of apertures and multimode waveguides. IEEE Microw. Wirel. Compon. Lett., 21 (12) (2011), 688690.
[21]CST Microwave Studio, CST Computer Simulation Technology AG.

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed