Abstract
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%.
| Original language | English (US) |
|---|---|
| Article number | 6484100 |
| Pages (from-to) | 421-424 |
| Number of pages | 4 |
| Journal | IEEE Antennas and Wireless Propagation Letters |
| Volume | 12 |
| DOIs | |
| State | Published - 2013 |
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Keywords
- Directivity
- electrically small antennas (ESAs)
- front-to-back ratio (FTBR)
- negative impedance converter (NIC)
- non-Foster element
- parasitic element
ASJC Scopus subject areas
- Electrical and Electronic Engineering
Cite this
Augmenting a modified egyptian axe dipole antenna with non-foster elements to enlarge its directivity bandwidth. / Tang, Ming Chun; Zhu, Ning; Ziolkowski, Richard W.
In: IEEE Antennas and Wireless Propagation Letters, Vol. 12, 6484100, 2013, p. 421-424.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Augmenting a modified egyptian axe dipole antenna with non-foster elements to enlarge its directivity bandwidth
AU - Tang, Ming Chun
AU - Zhu, Ning
AU - Ziolkowski, Richard W
PY - 2013
Y1 - 2013
N2 - 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%.
AB - 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%.
KW - Directivity
KW - electrically small antennas (ESAs)
KW - front-to-back ratio (FTBR)
KW - negative impedance converter (NIC)
KW - non-Foster element
KW - parasitic element
UR - http://www.scopus.com/inward/record.url?scp=84876147287&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84876147287&partnerID=8YFLogxK
U2 - 10.1109/LAWP.2013.2254103
DO - 10.1109/LAWP.2013.2254103
M3 - Article
VL - 12
SP - 421
EP - 424
JO - IEEE Antennas and Wireless Propagation Letters
JF - IEEE Antennas and Wireless Propagation Letters
SN - 1536-1225
M1 - 6484100
ER -