Complete outdoor radio unit for LMDS
US6640084B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Nov 29, 2000 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Apr 3, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/0058
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The complete outdoor radio unit for LMDS is a light weight, compact transceiver featuring planar circuitry. The transceiver uses cross polarization through an orthomodal transducer and frequency offset between transmit and receive to provide isolation between the transmitter and receiver. The transceiver includes three printed circuit boards directly attached by thermally conductive epoxy to a heat sink which forms part of the antenna dish/transceiver housing for effective heat transfer. Two of the waveguides are used as receiver and transmitter transmission lines into the orthomodal transducer, and two of the waveguides are used as bandpass filters. The transceiver also includes a DC—DC converter in the power supply which is modified to connect the base plate to the heat sink for compactness and improved heat transfer, and a frequency synthesizer with a phase locked loop hardwired to a single reference frequency for compact size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.