Abstract
Rotary transformers can be effectively used for low-noise amplifier (LNA) or down-converter power supply and control signal transmission in scanning-antenna applications. Three air-core designs, utilizing a square wave at audio frequencies, using HCMOS logic and giving a 5 V/0.6 A dc power feed, are discussed. The constructions allow further installation of RF rotary joints or other coaxial hardware up to a diameter of 100 mm. They add about 30 to 80 mm to the overall height of the antenna, depending on application and requirements. Bearing replacement with such a transformer is also possible, if adequate tolerances are met and suitable coil-support materials are selected.
| Original language | English |
|---|---|
| Article number | 5687521 |
| Pages (from-to) | 164-167 |
| Number of pages | 4 |
| Journal | IEEE Antennas and Propagation Magazine |
| Volume | 52 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1 Oct 2010 |
| MoE publication type | A4 Article in a conference publication |
Keywords
- measurement radar
- radar
- radar power supply
- radar scanner
- rotary joint
- Rotary transformer
- transformers