TY - JOUR
T1 - Electrically Small, Planar, Frequency-Agile, Beam-Switchable Huygens Dipole Antenna
AU - Wu, Zhentian
AU - Tang, Ming Chun
AU - Ziolkowski, Richard W.
N1 - Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Contract 62061006, in part by the Graduate Scientific Research and Innovation Foundation of Chongqing, China under Contract CYB20066, in part by the Chongqing Natural Science Foundation under Contract cstc2019jcyjjqX0004, and in part by the Australian Research Council under Grant DP160102219.
Publisher Copyright:
© 2021 IEEE.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - An electrically small, planar, frequency-agile, beam-switchable Huygens dipole antenna is investigated in this article. The near-field resonant parasitic (NFRP) design incorporates an Egyptian axe dipole (EAD) and a capacitively loaded loop (CLL) that function as the electric and magnetic NFRP elements, respectively. A varactor diode is integrated into each of these NFRP elements to facilitate simultaneous tuning of its operating frequency and switching its main beam direction. By changing the capacitance values of these two varactor diodes, the antenna realizes two independent, antipodal, unidirectional endfire radiating states with similar realized gain (RG) and front-to-back ratio (FTBR) values within virtually the same frequency-agile ranges. The experimental results demonstrate that the developed antenna exhibits a 5% frequency-agile fractional impedance bandwidth in both of its two oppositely directed endfire states. The antenna is electrically small at the highest frequency of this bandwidth (kahigh < 0.86) and has measured relatively high radiation efficiency (RE >67.7%), peak RG (2.1-3.19 dBi), and FTBR (5.61-13.4 dB) values, together with stable and uniform radiation patterns, over this frequency-agile range.
AB - An electrically small, planar, frequency-agile, beam-switchable Huygens dipole antenna is investigated in this article. The near-field resonant parasitic (NFRP) design incorporates an Egyptian axe dipole (EAD) and a capacitively loaded loop (CLL) that function as the electric and magnetic NFRP elements, respectively. A varactor diode is integrated into each of these NFRP elements to facilitate simultaneous tuning of its operating frequency and switching its main beam direction. By changing the capacitance values of these two varactor diodes, the antenna realizes two independent, antipodal, unidirectional endfire radiating states with similar realized gain (RG) and front-to-back ratio (FTBR) values within virtually the same frequency-agile ranges. The experimental results demonstrate that the developed antenna exhibits a 5% frequency-agile fractional impedance bandwidth in both of its two oppositely directed endfire states. The antenna is electrically small at the highest frequency of this bandwidth (kahigh < 0.86) and has measured relatively high radiation efficiency (RE >67.7%), peak RG (2.1-3.19 dBi), and FTBR (5.61-13.4 dB) values, together with stable and uniform radiation patterns, over this frequency-agile range.
KW - Beam-switchable antennas
KW - electrically small antennas (ESAs)
KW - frequency-agile antennas
KW - Huygens dipole antennas (HDAs)
KW - planar antennas
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U2 - 10.1109/TAP.2021.3090580
DO - 10.1109/TAP.2021.3090580
M3 - Article
AN - SCOPUS:85113271155
VL - 69
SP - 8271
EP - 8281
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
SN - 0018-926X
IS - 12
ER -