Low cost microstrip phase detector
US5909129A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | May 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D13/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low-cost microstrip phase detector that is photo-etched onto a circuit board is disclosed. The phase detector is used to detect the phase difference between two high-power radio frequency (RF) signals. One RF signal enters a delay line causing the signal to experience a 180.degree. phase shift. The other RF signal is not phase shifted. Both RF signals are then input into a Wilkinson combiner circuit. The structure of the Wilkinson combiner is such that there is no voltage output from the combiner when the two input signals are exactly 180.degree. out of phase. When the original signals (before the delay line) are in-phase, there is no voltage output from the combiner. However, when the original signals are out-of-phase to begin with, they do not enter the Wilkinson combiner with a 180.degree. phase difference. Instead, the phase difference is greater than or less than 180.degree., depending on whether one input signal leads or lags the other input signal. The signals are not fully dissipated in the balancing resistors, but produce a resultant output voltage from the combiner. This output voltage is proportional to the phase difference and amplitude of the input RF signals. The ou…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.