TY - JOUR
T1 - Wideband Differentially Fed Dual-Polarized Antenna by Using Three-Strip Transmission Lines
AU - Wen, Le-Hu
AU - Gao, Steven
AU - Luo, Q.
AU - Sanz-Izquierdo, Benito
AU - Ren, Xiaofei
AU - Wu, Jian
N1 - © 2020 IEEE. This is the accepted manuscript version of an article which has been published in final form at https://dx.doi.org/10.1109/TAP.2020.3044629
PY - 2021/7/1
Y1 - 2021/7/1
N2 - A new method of designing a wideband differentially fed dual-polarized antenna by using three-strip transmission lines (TS-TLs) is presented. A wideband power divider composed of four TS-TLs is firstly proposed and illustrated by using its equivalent circuit. Based on the proposed power divider, a wideband differentially fed dual-polarized antenna with four in-band resonances is developed. To enhance the out-of-band selectivity, two radiation nulls with quasi-elliptic response are obtained by utilizing the specifically designed structures in the TS-TL based power divider. The first radiation null at the lower out-of-band is produced by the resonance from the center strip of TS-TL and shorting coaxial cable. The second radiation null at the upper out-of-band is produced by the resonance from the slot formed by the dipole arm and the outer strip of TS-TL. Combining with the high 2nd-order harmonic suppression owing to the differentially fed method, the presented differentially fed antenna is demonstrated that it not only has high in-band selectivity covering 1.67-2.91 GHz, but also has high out-of-band suppressions of 33.8 dB and 20.6 dB over the frequency bands of 0.6-1 GHz and 3.3-5 GHz. In addition, stable gain and beamwidth are achieved for base station applications.
AB - A new method of designing a wideband differentially fed dual-polarized antenna by using three-strip transmission lines (TS-TLs) is presented. A wideband power divider composed of four TS-TLs is firstly proposed and illustrated by using its equivalent circuit. Based on the proposed power divider, a wideband differentially fed dual-polarized antenna with four in-band resonances is developed. To enhance the out-of-band selectivity, two radiation nulls with quasi-elliptic response are obtained by utilizing the specifically designed structures in the TS-TL based power divider. The first radiation null at the lower out-of-band is produced by the resonance from the center strip of TS-TL and shorting coaxial cable. The second radiation null at the upper out-of-band is produced by the resonance from the slot formed by the dipole arm and the outer strip of TS-TL. Combining with the high 2nd-order harmonic suppression owing to the differentially fed method, the presented differentially fed antenna is demonstrated that it not only has high in-band selectivity covering 1.67-2.91 GHz, but also has high out-of-band suppressions of 33.8 dB and 20.6 dB over the frequency bands of 0.6-1 GHz and 3.3-5 GHz. In addition, stable gain and beamwidth are achieved for base station applications.
KW - Differentially fed antenna
KW - dual-polarized antenna
KW - power divider
KW - three-strip transmission line
UR - http://www.scopus.com/inward/record.url?scp=85098792681&partnerID=8YFLogxK
U2 - 10.1109/TAP.2020.3044629
DO - 10.1109/TAP.2020.3044629
M3 - Article
SN - 0018-926X
VL - 69
SP - 4172
EP - 4177
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 7
ER -