Design of a planar tunable antenna based on the rectangular aperture

Abstract

In this paper, a coplanar waveguide (CPW)-fed planar antenna with frequency tuning capability and broadband characteristic is proposed. The antenna consists of a CPW feeding line, an arrow-shaped stub, a rectangular aperture, and two symmetric square apertures carved on the ground plane. Based on the narrow slot etched out, two varactors are employed as tunable elements to load into the slot. With the configuration adopted, the low frequency narrow band and the high frequency wide band are obtained. Results show that the low frequency tunable channel ranging from 1.5 to 2.05 GHz is achieved while the high frequency wide band maintaining. Further, the measured radiation patterns and gains exhibit relatively stable characteristics.

Keywords:

• planar antenna
• coplanar waveguide (CPW)
• narrow band
• frequency tuning
• broadband characteristic

Funding

This work is supported by the National Natural Science Foundation of China (NNSF) [grant number 61271090], and the National 863 Project of China [grant number 2012AA012305].