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Dual Polarization 2 × 2 Array Ku-Band Antenna with Improved Polarization Purity.

Tae-Hak Lee1, Hyungseok Nam2, Jungwon Seo2

  • 1Department of Electrical and Electronic Engineering, Yuhan University, Bucheon 14780, Republic of Korea.

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Summary
This summary is machine-generated.

This study introduces a Ku-band patch array antenna with dual-polarization capabilities. The novel feed network achieves excellent cross-polarization performance and high gain for both vertical and horizontal polarizations.

Keywords:
Ku-bandarray antennacross-polarizationdual-polarizationlinear polarizationmicrostrippower divider

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Area of Science:

  • Electromagnetics and Wave Propagation
  • Antenna Theory and Design
  • Microwave Engineering

Background:

  • Dual-polarization antennas are crucial for modern wireless communication systems, offering increased spectral efficiency.
  • Traditional dual-polarization feed networks often involve complex structures, increasing manufacturing costs and design challenges.
  • Achieving high cross-polarization discrimination (XPD) is essential for reliable signal transmission in dual-polarized systems.

Purpose of the Study:

  • To present a novel and simplified feed network for a Ku-band 2x2 patch array antenna.
  • To enable independent vertical and horizontal polarization operation with a compact feed structure.
  • To achieve superior cross-polarization performance and high gain across the operating bandwidth.

Main Methods:

  • Design and simulation of a 2x2 patch array antenna utilizing a cooperative feed network.
  • Implementation of a feed structure with two serially connected power dividers on a single plane.
  • Utilizing microstrip lines for element placement and signal routing to enhance performance.
  • Fabrication and measurement of the prototype antenna to validate simulation results.

Main Results:

  • The proposed antenna supports dual-polarization (vertical and horizontal) through a simple feed network.
  • Achieved a cross-polarization ratio better than 30 dB across the operating band.
  • Demonstrated a realized gain greater than 10 dB for both polarization modes.
  • The fabricated antenna operated at a center frequency of 14.9 GHz with a 6.8% fractional bandwidth.

Conclusions:

  • The presented Ku-band patch array antenna with its cooperative feed network offers an effective solution for dual-polarization applications.
  • The simplified feed structure reduces complexity and cost while maintaining high performance.
  • Measurement results confirm the antenna's suitability for wireless communication systems requiring high isolation and gain.