Dual band antenna having separate matched inputs for each band
US4672685A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1986 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Jan 3, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q5/35
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This dual input antenna system has a first input which provides an impedance match over a first range of frequencies and a second input which provides an impedance match over a second range of frequencies. This effectively enables a narrow band antenna to operate and provide a matched condition at two separate frequency ranges. First and second longitudinal radiating elements are connected at respective ends by an approximate 1/2 wavelength transmission line. The other end of each radiating element is connected by transmission lines to a receive filter and transmit filter, respectively. The receive and transmit filters provide a substantial reactance outside of the respective passbands. The wavelengths of the first and second transmission lines are selected to transform the reactance of each filter into a value which will provide a match condition for the other transmission line at the respective frequency ranges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.