Low impedance loop antennas
US6160525A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jan 28, 1999 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Jan 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Low impedance loop antennas utilize a loop separated into a plurality of radiating segments fed in parallel. A four point feed loop antenna, including radiating segments 12, 13, 14, 15 had a measured input impedance varying from 1.8 to 5.8 Ohms over a range of 5 to 15 MHz, without excessive radiation Q degradation. An incorporated feed network includes transmission line segments, with conductors on opposite surfaces of a thin substrate, connecting the radiating segments to a centrally mounted coaxial connector for parallel excitation. Operating bandwidth of the loop antenna is determined by the characteristic impedance of the transmission line feed segments. Low impedance loop antennas which are small relative to operating wavelength can be fabricated on a thin flexible substrate for field transport and use. Incorporation of the antenna into a jacket or other clothing enables field use while minimizing restriction of activity of the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.