Monopole/crossed slot single antenna direction finding system
US5402132A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1994 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Aug 12, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/29
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A direction finding system utilizing a single monopole/crossed slot antenna in combination with associated electronic circuitry. Each of the four ports of the antenna are connected to amplitude varying elements whose outputs are combined by a power combiner. A microcontroller stores the signal. The microcontroller also generates the signals which control the amplitude variation supplied by each of the amplitude varying elements. Two configurations of the amplitude varying elements are provided by predetermined settings within the microcontroller. The two settings are selected to configure the antenna on two distinct reception patterns, each with a predetermined angular offset from a reference direction. In operation the antenna will be configured for a first reception pattern. The signals received will be detected, quantified, and stored by the microcontroller which subsequently reconfigures the antenna for a second reception pattern. A second signal is received by the antenna in the second configuration and again is detected, quantified, and stored by the microcontroller. The microcontroller determines the difference between the two signals and, based upon a predetermined calibrat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.