Prohlížení Publikační činnost - 13117 dle autora "Hoffmann, Karel"

Zobrazují se záznamy 1-6 z 6

    • A New Concept of PTP Vector Network Analyzer 

      Autor: Závodný, Vadim; Hoffmann, Karel; Škvor, Zbyněk
      (IEEE, 2004-12)
      A new concept for vector network analyzers design based on a perturbation two-port (PTP) is presented. The approach uses redundant states of the PTP. The best states of the PTP for a certain place in Smith chart and frequency ...

    • A novel vector network analyzer 

      Autor: Hoffmann, Karel; Skvor, Zbyněk
      (IEEE, 1998-12)
      A calibration procedure for a perturbation two-port vector network analyzer is presented. It consists of a variable perturbation two-port placed between a device-under-test and a scalar network analyzer. A measured vector ...

    • Active Resonator 

      Autor: Hoffmann, Karel; Škvor, Zbyněk
      (IEEE, 2001-07)
      A new electrical component-active resonator-is designed. The component consists of a common passive resonant circuit whose losses are compensated by an extra active circuit. Experimental verification was done with a TE/sub ...

    • First results of microwave measurement of broadband radio interference filters 

      Autor: Hoffmann, Karel; Škvor, Zbyněk
      (IEEE, 2004-12)
      A vector measurement method for testing multiport interference filters for shielded chambers has been used. Measured data up to 3 GHz are presented. The authors believe that this is the first time such results have been published.

    • Hidden Problems in Precise Calibration on Microstrip 

      Autor: Raboch, Jiří; Hoffmann, Karel; Škvor, Zbyněk; Hudec, Přemysl
      (IEEE, 2008-12)
      A study of calibration problems on microstrip with respect to interaction of electromagnetic fields around SMA to microstrip launcher and microstrip short was carried out in frequency band up to 26 GHz. Omni Spectra SMA ...

    • On radio interference filter measurement 

      Autor: Hoffmann, Karel; Škvor, Zbyněk
      (IEEE, 2003-12)
      A new measurement method for on site testing of multiport radio interference filters (RIF) on shielded chamber is designed. The method is based on scalar measurement only and makes possible a pessimistic estimate of the ...