Transmit and receive diplexer for circular polarization
US4968957A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | May 31, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/034
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A diplexer for processing polarized energy at separate transmit and receive frequencies. The nature of the polarization may be circular, linear or elliptical depending upon the phasing associated therewith. The diplexer comprises a waveguide having first and second ports disposed at opposite ends thereof. A symmetrical bandpass resonator arrangement is disposed around the periphery of the waveguide and couples energy at the receive frequency out of the waveguide. A symmetrical bandstop resonator arrangement is also disposed around the periphery of the waveguide and filters energy at the receive frequency to prevent coupling of received energy to the second port. The bandpass resonators of each of the resonator arrangements generally include tuning members that control the amount of energy coupled from the waveguide and that adjust and balance the polarization components of the energy to maintain the polarization state thereof. A plurality of tuning rings may be diposed adjacent to the first port that compensate for the impedance mismatch caused by external components coupled to the waveguide. A tuning ring may also be provided at the second port that compensates for impedance misma…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.