Abstract

A new method to design wideband differentially driven dual-polarized antenna with high common-mode suppression and high port isolation is presented. The presented antenna can be equivalent as a combination of a six-port power divider and four crossed folded dipoles. The six-port power divider is composed of two orthogonal input ports and four equal magnitude output ports. Detailed analysis illustrates that the six-port power divider can have wide bandwidth and high isolation under odd-mode excitation and high common-mode suppression under even-mode excitation. Therefore, based on the wideband and high even-mode suppressed six-port power divider, a wideband differentially driven dual-polarized antenna is developed with high common-mode suppression. To validate the design concept, the proposed antenna was designed, fabricated, and measured. The measured results prove that the antenna has a wide impedance bandwidth of 1.64–3.0 GHz (58.6%) for the return loss higher than 15 dB and isolation higher than 35.4 dB. In addition, very high common-mode suppression is achieved for the measured common-mode reflection coefficient higher than −0.87 dB over the entire bandwidth. With stable antenna gain and half-power beamwidth, the developed antenna is suitable for base station applications.

Highlights

  • A Wideband Differentially Driven Dual-Polarized Antenna by Using IntegratedDetailed analysis illustrates that the six-port power divider can have wide bandwidth and high isolation under odd mode excitation and high common mode suppression under even mode excitation

  • DUAL-POLARIZED antennas have attracted many attentions owing to their advantages of low multi-fading effect and high channel capacity to the wireless communication systems, such as base stations, satellites, and radars systems [1]-[2]

  • This paper proposed a novel method of designing a wideband differentially driven dual-polarized antenna with high common mode suppression

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Summary

A Wideband Differentially Driven Dual-Polarized Antenna by Using Integrated

Detailed analysis illustrates that the six-port power divider can have wide bandwidth and high isolation under odd mode excitation and high common mode suppression under even mode excitation. Based on the wideband and high even mode suppressed six-port power divider, a wideband differentially driven dual-polarized antenna is developed with high common mode suppression. The measured results prove that the antenna has a wide impedance bandwidth of 1.64-3.0 GHz (58.6%) for the return loss higher than 15 dB and isolation higher than 35.4 dB.

INTRODUCTION
Configuration
Equivalent Circuit
Wideband Six-Port Power Divider
Even-Odd Mode Analysis
Antenna Design
Antenna Verification
Comparison
CONCLUSION

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