Microwave multiplexer with multimode filter
US4777459A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 8, 1987 |
| Grant date | Oct 11, 1988 |
| Priority date | — |
| Expiry date | Jun 8, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A microwave multiplexer has a set of independently tuneable signal channels coupled to a common waveguide. Each of the channels has input and output 3 dB couplers which are joined by cylindrical radiators carrying circularly polarized waves. Both TE and TM waves are propagated within a plurality of resonant cavities within each of the filters. Coupling between the cavities is provided by an array of slots and an array of probes wherein the slots couple TE waves and the probes couple TM waves. Adjustment of the slots and the probes provides for independent coupling coefficients for the two propagation modes. A set of coaxial line probe structures connect between the input and output couplers to end cavities of a filter for the launching of TM waves, there being discs in the end cavities adjacent the probes for converting energy of a TM wave to a TE wave, thereby providing both the TM and the TE wave propagation. There results a greater versatility in the coupling allowing for greater compaction of signal channel with reduced weight and bulk to the multiplexer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.