Quadrifilar helix antenna tuning using pin diodes
US4554554A · kind A · utility
82Cited by
1References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1983 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Sep 2, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/145
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna is tuned in separate discrete frequency bands by changing the ctrical length of the antenna. PIN diodes are placed at predetermined locations on the antenna coaxial cable radiating elements. When it is desired to shorten the antenna for a higher frequency band use, the diodes are biased short circuiting segments of the antenna. When the lower frequency band use is desired, diodes are unbiased so that the diodes act like a very small capacitance shunted by a large resistance which is essentially an open circuit permitting the entire length of the antenna to operate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.