Application Filing Date - Date of allowance
12/929,643 Feb. 7/ 2011 - Feb. 23/ 2015
An impedance synthesis method for single and multi-probe high resolution slide screw impedance RF and microwave tuners employs a fast calibration algorithm, which creates appropriately distributed calibration points over the Smith chart and a second order interpolation algorithm between calibration points, optimized for best suitability to the natural behavior of the tuners. The fast tuning algorithm uses a general search in order to identify the closest calibrated points, followed by a gradient search using fine interpolation grid in order to reach the final target. The method is applicable, after proper data preparation, also to double and triple probe harmonic tuners. The method allows tuning accuracy as high as -60dB, or deviation-from-target vector distance of 0.001 units on the Smith chart, whereas absence of the fine grid interpolation typically yields accuracies of the order of -20 dB, or a deviation-from-target vector distance of 0.1 reflection factor units.
13/893,610 Aug. 7/ 2013 - Sept. 22/ 2015
A hybrid load pull tuner system uses a combination of a passive and active tuner system. A closed loop system means that the system is independent of the available power of the device under test (DUT). The proposed hybrid system is formed around a closed loop Gamma Boosting Unit (GBU) consisting of two back to back broadband directional couplers, broadband variable time-delay, broadband variable phase-shifter and a broadband microwave amplifier, all inserted in the coupled path of the couplers; the GBU is connected in cascade with a passive tuner and boosts its reflection factor; for this the amplifier must have enough linear power and gain to match the difference between the power reflected back to the DUT by the passive tuner and the desired total reflected power to reach the expected Gamma, considering coupling loss and insertion loss of the test fixture.
13/904,688 May 29/ 2013 - Aug. 3/ 2015
A harmonic load pull system uses a number of synchronized signal sources to inject harmonic power into the output of a power transistor. The mismatch between the signal sources and the transistor internal impedance is reduced by using multi-harmonic tuners, which pre-match the impedance of the signal sources to the internal impedance of the transistor at each harmonic frequency independently. Actual tuning is electronic by changing the amplitude and phase of the injected signals. The transmitted and reflected waves are measured and optimized through bi-directional couplers connected between the transistor and the tuner and a wideband harmonic receiver.
14/133,746 Dec. 19/ 2013 - Sept. 23/ 2015
Multi-segment RF probes for automatic slide screw impedance tuners include a multitude of slugs, which are individually adjustable towards the center conductor of the slabline and spaced against each-other in order to create the required capacitance and transmission line space values needed for synthesizing resonant networks to match arbitrary reflection factor patterns over a given frequency range. The multi-segment probes are optimized using network synthesis software within the limits of the capacitance and inductance values allowed by the hardware. The probes allow constant phase testing for 100MHz bandwidths or more.
14/311,413 June 23/ 2014 - Sept. 15/ 2015
A new slide-screw impedance tuner structure uses rotating metallic probes. This ensures high resolution in the area where the gap between center conductor and probe is small (high GAMMA), a smooth increase of proximity between probe and center conductor (basic anti-corona form) and the possibility to compensate for the negative phase slope at higher GAMMA, native to traditional slide screw tuners. Additionally the new structure simplifies the tuner mechanics by eliminating the need for a precise vertical axis.
14/799,177 July 14/ 2015 - Sept. 23/ 2015
A continuously manually or remotely adjustable microwave attenuator and linear phase shifter is made using a two section slabline structure in which a "U" formed center conductor forms a line -stretcher to adjust the transmission phase and slivers of ferromagnetic material are inserted into the magnetic field of the slabline, or thin layers of dielectric material are inserted into the electric field serving either way to reducing the amplitude of the transmission factor, or increase the attenuation. The unit is manually or remotely controlled, in which case its transmission behavior can be calibrated on a VNA and used in test software for automated differential load pull operations.
14/013,156 # RE45667 Aug. 29/ 2013 - Sept. 8/ 2015
Reissue of 6,674,293 with corrected claim language.