A Low-Profile Dual-Polarized Omnidirectional Antenna for LTE Base Station Applications

A novel low-profile dual-polarized omnidirectional antenna is proposed in this communication, which is designed for 1.7-2.7 GHz LTE band operation. The horizontally polarized (HP) omnidirectional radiation is realized by a circular slot array. Eight stepped-impedance slots are fed by a one to eight...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2021-09, Vol.69 (9), p.5974-5979
Main Authors: Wen, Sichao, Xu, Yizhen, Dong, Yuandan
Format: Article
Language:English
Subjects:
Antenna feeds
Antenna radiation patterns
Antennas
Dual polarization (waves)
Dual-polarized antenna
Horizontal polarization
horizontal polarization (HP)
Impedance matching
low profile
LTE
Metal sheets
omnidirectional antenna
Omnidirectional antennas
Power dividers
Radiation
Reflector antennas
Slot antennas
Vertical polarization
vertical polarization (VP)
wideband antenna
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Summary:A novel low-profile dual-polarized omnidirectional antenna is proposed in this communication, which is designed for 1.7-2.7 GHz LTE band operation. The horizontally polarized (HP) omnidirectional radiation is realized by a circular slot array. Eight stepped-impedance slots are fed by a one to eight T junction power divider with equal amplitudes and phases. On the other hand, the vertically polarized (VP) omnidirectional radiation is realized by using the characteristics of the TM 0n mode of the cylindrical cavity, where eight shorting copper sheets are used to excite TM 01 and TM 02 modes. A one to four T junction power divider is used to feed the VP unit and achieve good impedance matching. The HP antenna is used to replace the top metal disk of the VP antenna unit, and eight slots are etched on the ground of the vertical polarization unit. It substantially solves the problem of matching deterioration when the horizontal polarization antenna is placed close to the ground. Besides, a special feeding method is employed to avoid the feeding intersection, which commonly appears in dual-polarized antennas. The antenna achieves an isolation around 35 dB and it has a low profile of 0.07\lambda _{\mathrm {min}} , with \lambda _{\mathrm {min}} being the free space wavelength at the lowest operation frequency. The proposed antenna has an omnidirectional beam, which is very suitable for indoor ceiling base station applications.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2021.3061108