Autonomous impedance tuner with human control interface

• US 8,203,348 B1
• Filed: 05/01/2009
• Issued: 06/19/2012
• Est. Priority Date: 05/01/2009
• Status: Active Grant

• Current Assignee: Christos Tsironis
• Original Assignee: Christos Tsironis
• Inventors: Tsironis, Christos
• Primary Examiner(s): Dole, Timothy J
• Assistant Examiner(s): Baldridge, Benjamin M
• Application Number:
  US12/453,194
• Time in Patent Office: 1,145 Days
• Field of Search: 324/638
• US Class Current: 324/638
• CPC Class Codes: G01R 31/318511 Wafer Test
• CPC Class Codes: H01P 5/04 with variable factor of coupling

Abstract

An electro-mechanical microwave impedance tuner operates as a stand-alone instrument and includes on-board digital processor, firmware, memory, digital display and human control interface, in form of a joystick, mouse, keyboard or tactile (touch sensitive) screen in order to recognize and execute commands for moving the tuner motors and probes, generating required microwaves impedances and calculating losses and de-embedding to reference planes different than the tuner ports. Before being used in operations the tuner can also be controlled by a control computer in order to be calibrated on a network analyzer and the data can be uploaded into the on-board memory in order to be used in the above calculations. During measurement and tuning operations the tuner is therefore stand-alone and totally independent of a control computer.

Claims

1. An autonomous stand-alone electromechanical impedance tuner, comprising:

a microwave impedance synthesis algorithm stored in a non-transitory memory that synthesizes user defined impedance patterns in the reflection factor plane/Smith chart, and

wherein said tuner comprises a low loss slotted airline/slabline between a test port and an idle port, one or more metallic probes that are positioned inside the slot of said slabline and can be moved horizontally and vertically into the slabline using remotely controlled electric motors and motor drive circuitry;

an on-board digital processor with associated firmware and associated memory for the purpose of uploading calibration data;

a digital alpha-numeric display showing the tuner state and response, and controlled through a human control interface, said human control interface allowing a user to activate said impedance synthesis algorithm, which then computes said tuner'"'"'s probe positions to create said user-defined pattern on the Smith chart and scans all impedances lying on said pattern and controls said motors of said tuner in order to move said probes to the appropriate positions to synthesize a desired impedance.

2. An autonomous stand-alone electromechanical impedance tuner as in claim 1, where said pattern is a concentric circle on the Smith chart with a radius defined by the user, said radius corresponding to a constant reflection factor, thus allowing scanning all phases from 0 to 360 degrees.

3. An autonomous stand-alone impedance tuner as in claim 1, wherein said human control interface comprises a joystick, wherein the joystick is either integral to the tuner, or externally coupled to the tuner.

4. An autonomous stand-alone impedance tuner as in claim 3, where said human control interface is a digital mouse, connected with the main processor inside said tuner and allowing the same operations as said joystick.

5. An autonomous stand-alone impedance tuner as in claim 3, where said human control interface is a computer keyboard connected with the main processor inside said tuner and allowing the same operations as said joystick.

6. An autonomous stand-alone impedance tuner as in claim 3, where said human control interface is a touch-sensitive/tactile digital screen, connected with the main processor inside said tuner and allowing the same operations as said joystick;

wherein said tactile digital screen allows displaying a Smith Chart and allows entering graphically the target impedance for the tuner by pointing to it with a pointer stylus.

7. A method for using an autonomous stand-alone electromechanical impedance tuner, said tuner comprising an input port and an output port and a slabline between said ports and one or more conductive capacitive probes remotely insertable into the slot of said slabline, wherein the probes can be moved horizontally and vertically into the slabline using remotely controlled electric motors and motor drive circuitry;

an on-board digital processor with associated firmware and associated memory for the purpose of uploading calibration data;

a digital alpha-numeric display showing the tuner state and response; and

a human control interface that activates an impedance synthesis algorithm, the method comprising;

synthesizing, using the microwave impedance synthesis algorithm stored in a non-transitory memory, user defined impedance pattern in the reflection factor plane/Smith chart;

controlling the probe positions with a human control interface coupled to the tuner; and

activating tuning routines from a menu with the human control interface.

8. A method as in claim 7, wherein the human control interface comprises a tactile screen coupled to said tuner, and wherein the tactile screen allows a user to activate tuning routines, including point-and-tune on a Smith chart.

9. A method as in claim 7, wherein the human control interface comprises a keyboard connected to said tuner, allowing a user to enter target impedances into the tuner firmware, or activate tuning routines from a menu.

10. A method as in claim 7, wherein the human control interface comprises a joystick, wherein the joystick is either integral to the tuner, or externally coupled to the tuner, and further comprises the method steps:

controlling the probe positions with the joystick; and

activating tuning routines from a menu with the joystick.