Claims
- 1. A dual-directional coupler for generating an output signal representative of a true transmitted power in an RF transmission line comprising:
a first detector; a second detector; and a differential amplifier having first and second input terminals and an output terminal, wherein the first input terminal is coupled to the first detector and the second input terminal is connected to the second detector; and an RF coupling section having an input terminal and output terminal, wherein said input terminal is connected to the first detector and said output terminal is connected to the said second detector.
- 2. The dual-directional coupler of claim 1 wherein said RF coupling section has a length of 0.22 cm.
- 3. The dual-directional coupler of claim 1 wherein said RF coupling section has a width of 0.30 mm.
- 4. The dual-directional coupler of claim 1 wherein said RF coupling section has a parallel spacing of 0.30 mm from said RF transmission line.
- 5. The dual-directional coupler of claim 1 further comprising an analog to digital converter coupled to the output of said differential amplifier to generate a digital word representing the true transmitted power.
- 6. The dual-directional coupler of claim 1 wherein the apparatus is contained in a module.
- 7. The dual-directional coupler of claim 6 wherein said module has a length of less than 2.5 mm and a width of less than 2.5 mm.
- 8. The dual-directional coupler of claim 6 wherein said module is a surface mount device.
- 9. The dual-directional coupler of claim 1 further comprising a ceramic substrate.
- 10. A method for measuring true transmitted radio frequency power with a dual-directional coupler and producing an output signal representative of said true transmitted power comprising a first detector, a second detector, a differential amplifier having a first and second input and an RF coupling section having an input and output terminal, wherein the first detector is coupled to the first input of said differential amplifier, the second detector is coupled to the second input of said differential amplifier, the first detector is coupled to the input of said coupling section, the second detector is coupled to the output of said coupling section, the method comprising the steps of:
detecting RF power at the input of the coupling section using said first detector and generating a representative voltage at the first input of the differential amplifier, detecting RF power at the output of the coupling section using said second detector and generating a representative voltage at the second input of the differential amplifier, and combining said first and second detector voltages using the differential amplifier; and generating a signal proportional to said voltages.
- 11. The method according to claim 8 further comprising the step of converting an analog output voltage of the differential amplifier to a digital word.
- 12. A dual-directional coupler comprising:
a substrate; a stripline, attached to said substrate, for propagation RF signals from an input to an output; a coupling section, attached to said substrate, and positioned parallel to said stripline, for coupling incident and reflected RF signals from the stripline; where said substrate has a length and width of less than 2.5 cm by 2.5 cm.
- 13. The dual-directional ooupler of claim 12 wherein said substrate is ceramic.
- 14. The dual-directional coupler of claim 12 wherein said RF coupling section has a length of 0.22 cm.
- 15. The dual-directional coupler of claim 12 wherein said RF coupling section has a width of 0.30 mm.
- 16. The dual-directional coupler of claim 12 wherein said RF coupling section has a parallel spacing of 0.30 mm from said RF transmission line.
- 17. The dual-directional coupler of claim 12 further comprising:
a first detector coupled to a first end of said coupling section; and a second detector coupled to a second end of said coupling section.
- 18. The dual-directional coupler of claim 17 further comprising a differential amplifier coupled to said first and second detectors.
Parent Case Info
[0001] This application claims the benefit of U.S. Provisional Application No. 60/186,546 filed Mar. 2, 2000, which is herein incorporated by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60186546 |
Mar 2000 |
US |