Augmenting a modified egyptian axe dipole antenna with non-foster elements to enlarge its directivity bandwidth
- Publication Type:
- Journal Article
- Citation:
- IEEE Antennas and Wireless Propagation Letters, 2013, 12 pp. 421 - 424
- Issue Date:
- 2013-04-17
Closed Access
| Filename | Description | Size | |||
|---|---|---|---|---|---|
| 06484100.pdf | Published Version | 677.69 kB |
Copyright Clearance Process
- Recently Added
- In Progress
- Closed Access
This item is closed access and not available.
Non-Foster elements are introduced to augment an Egyptian axe dipole (EAD) antenna-based system in order to expand its directivity bandwidth. The frequency-agile properties of the original antenna system are investigated near 300 MHz by linearly and discretely changing the values of its internal reactive element. The curve-fit reactance versus frequency curve is established. It is reproduced approximately by augmenting the antenna system with two non-Foster elements implemented internally in one of its near-field parasitic elements and with negative impedance convertor (NIC) designs. It is demonstrated that the resulting electrically small antenna system is capable of achieving excellent unidirectional radiation performance, including a broadside directivity in the range from 5.78 to 6.24 dB with more than a 20 dB front-to-back ratio (FTBR) over a 13% instantaneous fractional bandwidth. The corresponding half-power beamwidths in the E-and H-planes, respectively, are 78° and 138° the radiation efficiency exceeds 65%. © 2002-2011 IEEE.
Please use this identifier to cite or link to this item: