Study Of Metamaterials-based Antenna On USB Dongle

As basic key element of mobile terminal products, the antenna is becomingincreasingly important with the rapid development of wireless communication.Miniaturization of mobile device is the common goal both for the designers andconsumers, which makes the design of miniaturized antenna has become urgent.Because the2G and3G spectrums are coexisting in current communication system,antenna on small mobile terminals must cover more bands and meanwhile it has smallersize. The development of modern mobile technology and the diversity of equipmentfunction require the communication system with higher communication quality andspeed. While the Multi-input and Multi-output (MIMO) technology can achieve thisgoal by using multiple antennas as transmitters and receivers. The application of MIMOtechnology on mobile devices is very difficult because of its requirement of the size andperformance of the antenna as well as the isolation. This paper proposes the design ofthe antenna with miniaturization, multi-band, high performance and high isolation ofMIMO system on wireless USB dongle platform, according to the zeroth-orderresonance principle based on the composite right/left-handed transmission line theory.This paper discusses the performance parameters of the antenna, and mainlydescribes the specific absorption rate (SAR) and its relevant theory on the wireless USBdongle platform. The basic principle and the characteristics of the left hand materials arediscussed in detail. Moreover, the basic characteristics and implementation method ofthe composite right/left-handed transmission line theory are analyzed. At the same timethis paper gives detailed description for the basic principle and basic performance ofMIMO communication technology.In this paper, an antenna with small size and high performance on the USB dongleplatform is proposed. The proposed antenna operators in double resonant circuit modesin parallel according to the zeroth-order resonance theory. The operation frequency bandof this antenna covers multiple communication frequency bands, from745to1045MHzand1915to2700MHz. This antenna has the monopole-typed radiation pattern and highradiation efficiency. The actual measurement data of the fabricated antenna validates theproposed design.The decoupling methods of MIMO system have been studied in the introduction ofthis paper. A MIMO system consisting of two proposed metamaterial antennas on theUSB dongle platform is designed. This MIMO system can simultaneously operate awide bandwidth covering the LTE band13(746-787MHz), GSM850/900(824-960MHz) and LTE7(2500-2690MHz) and has a good isolation across the operation band. Themeasured isolation between two antenna elements are less than-8dB over the lowerband and-16dB across the upper band, respectively. Good radiation patterncharacteristic and the total efficiency as high as40%are observed. ECC parameters andthe SARs of the system satisfy the engineering standard. In words, the proposed antennais applicable to4G USB dongle applications since its small size and good efficiency foreach band.