SFCFOS Uniform and Chebyshev Amplitude Distribution Linear Array Antenna for K-Band Applications

Abstract

In this study, a compact series-fed center-fed open-stub (SFCFOS) linear array antenna for K-band applications is presented. The antenna is composed of a single-line 10-element linear array. A symmetrical Chebyshev amplitude distribution (CAD) is used to obtain a low sidelobe characteristic against a uniform amplitude distribution (UAD). The amplitude is controlled by varying the width of the microstrip patch elements, and open-ended stubs are arranged next to the last antenna element to use the energy of the radiating signal more effectively. We insert a series-fed stub between two patches and obtain a low mutual coupling for a 4.28-mm center-to-center spacing (0.7λ at 21 GHz). A prototype of the antenna is fabricated and tested. The overall size of the uniform linear array is 7.04 × 1.05 × 0.0563 λg3 and that of the Chebyshev linear array is 9.92 × 1.48 × 0.0793 λ g3. The UAD array yields a |S11| < −10 dB bandwidth of 1.33% (20.912–21.192 GHz) and 1.45% (20.89–21.196 GHz) for the CAD. The uniform array design gives a −23 dB return loss, and the Chebyshev array achieves a −30.68 dB return loss at the center frequency with gains of 15.3 dBi and 17 dBi, respectively. The simulated and measured results are in good agreement.

Keywords

• Chebyshev Amplitude Distribution (CAD)
• Linear Array
• Microstrip
• Series-Fed Center-Fed Open-Stub (SFCFOS)
• Uniform Amplitude Distribution (UAD)