Abstract
A small dual-band monopole antenna with coplanar waveguide (CPW) feeding structure is presented in this paper. The antenna is composed of a meandered monopole, an extended conductor tail, and an asymmetrical ground plane. Tuning geometrical structure of the ground plane excites an additional resonant frequency band and thus enhances the impedance bandwidth of the meandered monopole antenna. Unlike the conventional monopole antenna, the new resonant mode is excited by a slot trace of the CPW transmission line. The radiation performance of the slot mode is as similar as that of the monopole. The parametrical effect of the size of the one-side ground plane on impedance matching condition has been derived by the simulation. The measured impedance bandwidths, which are defined by the reflection coefficient of −6 dB, are 186 MHz (863–1049 MHz, 19.4%) at the lower resonant band and 1320 MHz (1490–2810 MHz, 61.3%) at the upper band. From the results of the reflection coefficients of the proposed monopole antenna, the operated bandwidths of the commercial wireless communication systems, such as GSM 900, DCS, IMT-2000, UMTS, WLAN, LTE 2300, and LTE 2500, are covered for uses.
Highlights
Because of the recent demand to incorporate more communication services, multiband antennas that are designed with sufficient bandwidths to cover operating bands are presently very important topics of research
The monopole antenna, especially the coplanar waveguide (CPW) feeding structure, has received much attention owing to its attractive advantages such as low profile, light weight, broad impedance bandwidth, and easy fabrication [1,2,3,4,5,6]
The design and simulation of the proposed CPW-fed monopole antenna were conducted by using the EM software ANSYS High Frequency Structure Simulator (HFSS)
Summary
Because of the recent demand to incorporate more communication services, multiband antennas that are designed with sufficient bandwidths to cover operating bands are presently very important topics of research Among these antennas, the monopole antenna, especially the CPW feeding structure, has received much attention owing to its attractive advantages such as low profile, light weight, broad impedance bandwidth, and easy fabrication [1,2,3,4,5,6]. By tuning the width of the CPW ground plane, it is found that the impedance bandwidth with dual-band operation is achieved. A triple-band antenna with a LI-shaped radiating topology and coplanar waveguide (CPW) feeding is presented in [6] Both resonance numbers and impedance bandwidths are improved by utilizing the monopole structure. The radiation mechanism of the proposed antenna is explained by the distribution of the electric and magnetic current distributions
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