TY - JOUR
T1 - Direction-of-Arrival Estimation Enhancement for Closely Spaced Electrically Small Antenna Array
AU - Yu, Xiaoju
AU - Xin, Hao
N1 - Funding Information:
Manuscript received August 25, 2016; revised March 8, 2017 and April 25, 2017; accepted April 29, 2017. Date of publication May 31, 2017; date of current version January 4, 2018. This work was supported in part by the U.S. Army Research Laboratory and in part by the U.S. Army Research Office under Grant W911NF-1-01-0285. (Corresponding author: Xiaoju Yu.) X. Yu was with the Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721 USA. She is now with Qualcomm Inc., San Diego, CA 92121 USA.
Publisher Copyright:
© 2017 IEEE.
PY - 2018/1
Y1 - 2018/1
N2 - In this paper, compact direction finding systems using a scatterer of a high dielectric constant in between adjacent closely spaced electrically small antennas are examined. By adding a high-permittivity scatterer, the directional sensitivity can be enhanced. However, due to limited physical dimension, an electrically small antenna has highly reactive impedance. To enhance the received power level, a matching network is included. The highest directional sensitivity satisfying a given power constraint is compared for with and without scatterer cases. In addition, widely used matching approaches such as multiport-conjugate matching (MCM), self-conjugate matching (SCM), and eigenmode decoupling matching are investigated to increase the received power. The impact of these matching networks on the directional sensitivity is studied. The power and the directional-sensitivity bandwidth after matching are also analyzed. Finally, the two-monopole and a high-permittivity scatterer system with SCM and MCM circuits is fabricated and tested.
AB - In this paper, compact direction finding systems using a scatterer of a high dielectric constant in between adjacent closely spaced electrically small antennas are examined. By adding a high-permittivity scatterer, the directional sensitivity can be enhanced. However, due to limited physical dimension, an electrically small antenna has highly reactive impedance. To enhance the received power level, a matching network is included. The highest directional sensitivity satisfying a given power constraint is compared for with and without scatterer cases. In addition, widely used matching approaches such as multiport-conjugate matching (MCM), self-conjugate matching (SCM), and eigenmode decoupling matching are investigated to increase the received power. The impact of these matching networks on the directional sensitivity is studied. The power and the directional-sensitivity bandwidth after matching are also analyzed. Finally, the two-monopole and a high-permittivity scatterer system with SCM and MCM circuits is fabricated and tested.
KW - Biologically inspired
KW - direction-of-arrival (DoA) estimation
KW - electrically small antenna array
KW - matching networks
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U2 - 10.1109/TMTT.2017.2704932
DO - 10.1109/TMTT.2017.2704932
M3 - Article
AN - SCOPUS:85040307727
SN - 0018-9480
VL - 66
SP - 477
EP - 484
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
IS - 1
M1 - 7936495
ER -