Abstract
A novel two-iteration binary tree fractal bionic structure antenna is proposed for the third generation (3G), fourth generation (4G), WLAN, and Bluetooth wireless applications in the paper, which is based on the principles of conventional microstrip monopole antenna and resonant coupling technique, combined with the advantages of fractal geometry. A new fractal structure was presented for antenna radiator, similar to the tree in nature. The proposed antenna adapted two iterations on a fractal structure radiator, which covers mobile applications in two broad frequency bands with a bandwidth of 44.2% (1.85–2.9 GHz) for TD-SCDMA, WCDMA, CDMA2000, LTE33-41, and Bluetooth frequency bands, and 11.5% (4.9–5.5 GHz) for WLAN frequency band. The proposed antenna was fabricated on a G10/FR4 substrate with a dielectric constant of 4.4 and a size of 50 × 40 mm2. The good agreement between the measurement results and the simulation results validate that the proposed design approach meet the requirements for various wireless applications.
Highlights
In recent years, due to the rapid development in wireless communication technology and applications, the demand for multiband wireless mobile terminals has been increasing. erefore, it is necessary to design the multiband, compact, low profile, and low-cost antennas, and many types of antennas have been proposed to achieve multiband functions
Various methods have been studied to obtain multiband enhancement, including slot-loaded technologies [3,4,5], coupling feed technologies [6, 7], loading the matching network [8], and fractal technologies [9]. e desired resonant frequency band is produced by controlling the current path and resonant mode of the antenna radiator
With the miniaturization of the terminal device, the radiator is usually bent and folded to increase the antenna electrical length to make the antenna operate at lower frequencies [12]. e bending and folding method of the antenna radiator structure is used to increase the electrical length of the antenna to achieve miniaturization of the antenna [13,14,15]
Summary
Received 29 July 2019; Revised 25 October 2019; Accepted 22 November 2019; Published 9 January 2020. A novel two-iteration binary tree fractal bionic structure antenna is proposed for the third generation (3G), fourth generation (4G), WLAN, and Bluetooth wireless applications in the paper, which is based on the principles of conventional microstrip monopole antenna and resonant coupling technique, combined with the advantages of fractal geometry. A new fractal structure was presented for antenna radiator, similar to the tree in nature. E proposed antenna adapted two iterations on a fractal structure radiator, which covers mobile applications in two broad frequency bands with a bandwidth of 44.2% (1.85–2.9 GHz) for TD-SCDMA, WCDMA, CDMA2000, LTE33-41, and Bluetooth frequency bands, and 11.5% (4.9–5.5 GHz) for WLAN frequency band. E good agreement between the measurement results and the simulation results validate that the proposed design approach meet the requirements for various wireless applications A new fractal structure was presented for antenna radiator, similar to the tree in nature. e proposed antenna adapted two iterations on a fractal structure radiator, which covers mobile applications in two broad frequency bands with a bandwidth of 44.2% (1.85–2.9 GHz) for TD-SCDMA, WCDMA, CDMA2000, LTE33-41, and Bluetooth frequency bands, and 11.5% (4.9–5.5 GHz) for WLAN frequency band. e proposed antenna was fabricated on a G10/FR4 substrate with a dielectric constant of 4.4 and a size of 50 × 40 mm2. e good agreement between the measurement results and the simulation results validate that the proposed design approach meet the requirements for various wireless applications
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