High frequency analysis of a device under test
AssigneeThe Curators of the University of Missouri
InventorsReza Zoughi, Mohamed Ahmed AbouKhousa, Sergiy Kharkivskiy
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Abstract
Analyzing a device under test (“DUT”) at higher frequencies. A phase shifter varies the phase of a standing wave on a transmission line coupled to the DUT. The standing wave magnitude is sampled at each of the phase shifts and one or more DUT characteristics are determined as a function of the sampled magnitudes and phase shifts. Further aspects include a related phase shifter comprising a waveguide having a plurality of sub-resonant slots formed therein and having active elements for loading the slots to control the phase shift applied to the signal.
Claims20
A phase shifter coupled with a transmission line for applying a phase shift to a signal on the transmission line, said signal being at a frequency greater than very high frequency, said phase shifter comprising a waveguide having a plurality of slots formed therein, said slots each having dimensions that are sub-resonant with respect to a wavelength of the signal on the transmission line, and said slots each having an active element corresponding thereto for loading the slots to control the phase shift applied to the signal.
A system comprising:
- a transmission line for coupling a signal source to a device under test, wherein the signal source provides a signal incident to the device under test at a frequency greater than very high frequency and wherein the signal incident to the device under test and a signal reflected from the device under test form a standing wave on the transmission line;
- and
- a phase shifter coupled to the transmission line for applying a phase shift to the standing wave on the transmission line, said phase shifter comprising one or more sub-resonant slots, said slots each having an active element corresponding thereto, and wherein the phase shifter controls the active element to load the slot to which the active element corresponds for varying the phase of the standing wave.
A method for analyzing a device under test coupled to a transmission line, the transmission line having a phase shifter coupled thereto, said method comprising:
- generating a standing wave on the transmission line, the standing wave comprising a coherent addition of a signal incident to the device under test and a signal reflected from the device under test, wherein a greater than very high frequency signal source supplies the signal incident to the device under test;
- applying, by the phase shifter, a phase shift to the coherent standing wave signal on the transmission line, said phase shifter comprising one or more sub-resonant slots, said slots each having an active element positioned therein, and wherein the phase shifter controls the active element to load the slot in which the active element is positioned for varying the phase of the standing wave;
- sampling a magnitude of the shifted standing wave at each of a plurality of phase shifts;
- and
- determining at least one characteristic representative of the device under test as a function of the sampled magnitude of the standing wave and the plurality of phase shifts.
Dependencies are inferred from the claim text.