Transition between rectangular and relatively large circular waveguide for a UHF broadcast antenna
US4630316A · kind A · utility
Inventor
Key dates
| Filing date | Apr 12, 1983 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Apr 12, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/16
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A high power TV antenna for operation at the ultra high frequency (UHF) frequency F includes a radiating antenna located at the top of a tower structure (often hundreds of feet high), a transmitter at the bottom of the tower and a main circular waveguide transmission line of diameter Dl between the transmitter and the antenna carried by the tower; the feed to and/or from the transmission line including transition sections such that wave propagation in the transition sections is below cutoff for the TM01 mode while it is above cutoff for the dominant TE11 mode while wave propagation in the main circular waveguide transmission line of diameter Dl is substantially totally in the dominant TE11 mode even while it is above cutoff for the TM01 mode, whereby the transition sections tend to inhibit wave propagation in the system in the undesired TM01 mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.