Simplified Printed Log-Periodic Dipole Array Antenna Fed by CBCPW

Guohua Zhai,Qiuyan Yin,Jianjun Gao,Shouzheng Zhu,Yong Cheng

doi:10.1155/2013/548610

Abstract

A novel simple approach for designing single-layer printed log-periodic dipole array (PLPDA) antenna fed by conductor-backed coplanar waveguide (CBCPW) is presented. The PLPDA antenna has the merits of wide bandwidth, low profile, and stable radiation pattern, which should be fed by the balanced line. The balanced line, created by the geometric features of the CBCPW, provides a balun with a considerably wide bandwidth with low profile, broad bandwidth, low insertion loss, and so forth. The prototype of the proposed CBCPW-fed printed log-periodic array at Ka band is designed and fabricated; the measured data are in good agreement with the simulated results.

Highlights

As an end-fire type antenna, the log-periodic dipole array (LPDA) antenna has the merits of fixed peak radiation and stable radiation pattern within the operating frequency, so it is one of the candidates for the modern wireless communications system
A single-layer slot printed log-periodic dipole arrays (PLPDA) antenna fed by coplanar waveguide (CPW) was proposed [14], the CPW transmission line has been widely used in the monolithic millimeter-wave integrated circuits (MMIC), but this transmission line suffers from high insertion loss in the transition, radiation loss, serious crosstalk, and lower power handling capability because of its open structure
All of the measured results shown below include the losses of 50 Ω conductor-backed coplanar waveguide (CBCPW) insertion loss, the 2.4 mm to 3.5 mm adapters, and the SMA connectors

Summary

Introduction

As an end-fire type antenna, the log-periodic dipole array (LPDA) antenna has the merits of fixed peak radiation and stable radiation pattern within the operating frequency, so it is one of the candidates for the modern wireless communications system. The fabrication cost is reduced by using single-layer printed circuit, so the single-layer PLPDA antennas with two coaxial cables as the feeding network were proposed [12, 13]. The printed dipoles of the PLPDA antenna mentioned above are all cross-symmetrically spaced along the parallel feed lines on both sides of the dielectric substrate. It necessitates two sides of the substrate to be etched. The feed lines of the PLPDA antenna are printed on only one side of the dielectric substrate This novel antenna alleviates the deign complexity, reduces the cost, and can be easy to integrate with MMIC

CBCPW PLPDA

Experimental Results

Conclusion