Abstract
A compact wideband printed antenna with deca-band 4G/5G/WLAN for mobile phone devices is proposed in this paper. The complete structure is composed of a monopole antenna and a coupling strip, occupying a small C-shape PCB area of 27 × 10.8 mm2. This antenna, which is printed on FR4 substrate with 0.8 mm thickness and fed by a coaxial cable, can provide three wide operating bandwidths that cover 685–1012 MHz, 1596–2837 MHz, and 3288–3613 MHz for 4G/5G/WLAN communication systems. The gains and total radiation efficiencies of the antenna in the low, middle, and high bands are 1.4 dBi–2.5 dBi and 38%–47%, respectively. Besides, the measured results are in good agreement with the simulated results. Further experiments demonstrate that the proposed antenna exhibits a good performance for mobile phones.
Highlights
Rapid development of the wireless communication systems, especially the wide use of 2G/3G/4G devices and mobile phone antennas with small sizes and wide operating bands, are more attractive for practical applications
A compact wideband printed mobile phone antenna, covering the LTE (Long-Term Evolution) 700, GSM (Global System for Mobile Communications) 850, GSM900, DCS (Digital Cellular System) 1800, PCS (Personal Communications Service) 1900, UMTS (Universal Mobile Telecommunications System) 2100, LTE2300, LTE2500, and 5G (3300–3600 MHz), is of interest. These mobile phone antennas need to be able to operate at a wider scope of different frequencies and work in a very limited space
In order to cover the LTE/ WWAN (Wireless Wide Area Network) operation in the 700 MHz band, the radiating board in the printed monopole occupies a large volume, which may be folded to achieve a compact size in the mobile phone
Summary
Rapid development of the wireless communication systems, especially the wide use of 2G/3G/4G devices and mobile phone antennas with small sizes and wide operating bands, are more attractive for practical applications. Several techniques have been reported to widen the bandwidth and reduce the occupied space, including the multiple branches technique [7, 8], the reconfigurable method [9, 10], and the lumped-element matching method [11,12,13,14] Another popular technique is the coupled-fed method [15, 16], which provides a convenient matching tuning mechanism. By adding the staircase-shaped coupled ground strip, the interaction between the driven strip and the coupled strip may generate another resonant mode around 2260 MHz, thereby improving the impedance matching and widening the middle bandwidth.
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