W‐band six‐port network analyzer for two‐port characterization of millimeter wave transistors

1989 ◽  
Vol 60 (3) ◽  
pp. 433-438 ◽  
Author(s):  
Karl J. Moeller ◽  
James H. Schaffner ◽  
Harold R. Fetterman
Keyword(s):  
Millimeter Wave ◽  
Network Analyzer ◽  
W Band

scholarly journals Characterization Techniques of Millimeter-Wave Orthomode Transducers (OMTs)

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1844
Author(s):  
Alessandro Navarrini ◽  
Renzo Nesti
Keyword(s):  
Millimeter Wave ◽  
Time Domain ◽  
General Validity ◽  
Characterization Methods ◽  
Fundamental Parameters ◽  
Advantages And Disadvantages ◽  
W Band ◽  
Quarter Wave ◽  
Orthomode Transducers

We report on advanced techniques for the accurate characterization of millimeter-wave Orthomode Transducers (OMTs) enabling the derivation of the fundamental parameters of such devices, i.e., the insertion loss, the return loss, the cross-polarization, and the isolation. These techniques include standard frequency-domain and time-domain VNA (Vector Network Analyzer) measurement methods, which can be applied to remove the effects of the waveguide transitions necessary to access the OMT ports and excite the desired modes. After reviewing the definition of the OMT parameters, we discuss the test equipment, the VNA calibration procedures as well as the VNA time-domain time-gating method for application in OMT characterization. We present simplified equations that relate the calibrated VNA measured quantities with the OMT S-parameters, illustrate various characterization methods, and examine various OMT experimental test setups. The advantages and disadvantages of each of the OMT characterization procedures are presented and compared among them. We provide a list of waveguide components required in the OMT test setups (adapters, loads, quarter-wave and longer waveguide sections, feed-horn, etc.), discuss the error terms introduced by such components and examine their impact on the measured values. Furthermore, we identify strategies to mitigate or remove the effects of the measured errors, to derive the desired OMT parameters. Different OMT configurations, with a distinct orientation of the waveguide input and outputs, are discussed. Although the presented techniques refer to the characterization of a specific configuration of a W-band OMT, the described methods can be applied to other OMT configurations and frequency ranges (from microwave to THz frequencies), therefore having a general validity.

Fully polarimetric passive W-band millimeter wave imager for wide area search

2013 ◽  
Author(s):  
Jonathan Tedeschi ◽  
Bruce Bernacki ◽  
Dave Sheen ◽  
Jim Kelly ◽  
Doug McMakin
Keyword(s):  
Millimeter Wave ◽  
Wide Area ◽  
W Band

Design and Characterization of a $W$-Band Micromachined Cavity Filter Including a Novel Integrated Transition From CPW Feeding Lines

2007 ◽  
Vol 55 (12) ◽  
pp. 2902-2910 ◽  
Author(s):  
Yuan Li ◽  
Bo Pan ◽  
Cesar Lugo ◽  
Manos Tentzeris ◽  
John Papapolymerou
Keyword(s):  
W Band
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