| In recent years,As the developing of technology in mobile communication and the upgrading of LTE criterion.Miniaturized,intelligent,multi-function and multi-network communication mode have become the development tendency of mobile terminal equipment.As the key element for transmitting and receiving electromagnetic wave signals to the mobile terminal,the function of antenna not only affect the performance of channel but also play a decisive role in the overall performance of mobile terminals.So research and design full netcom antenna with miniature and good performance for the mobile terminal unit has a great engineering application value.In this thesis,three kinds of 4G full netcom antenna for the mobile terminal are proposed.The works and research contents are as follows:A novel miniaturized five frequency LTE antenna with overall size of 102mm X 10mm × O.8mm is proposed.The monopole antenna which made up by radiation stubs,short circuit parasitic unit and reference ground.The short circuit parasitic unit connected with reference ground via a metal patch.The antenna can achieve suitable bandwidth at low frequency and high frequency by loading short circuit parasitic unit and multimode resonance of radiation stubs between short circuit parasitic unit.THe measured-6dB impendence bandwidth of the antenna prototype is 0.81?1.05 GHz,1.90?2.73GHz.The antenna has a simple structure,wide bandwidth,small size and good radiation performance.A novel miniaturized antenna with the overall size of 98mm×14mm×1mm for full Netcom mobile terminal devices is proposed.The antenna consists of irregularly shaped reference ground plane and high-frequency randiated branch,and is fed with coaxial cable.The low-frequency of the antenna is achieved by fundamental mode of the reference ground plane.The high-frequency is accomplished by the fundamental mode of the high frequency radiated branch and the higher modes excited in the branch of reference ground plane.The bandwidth and gain of the antenna are enhanced by regulating the width of the radiation branch and the radiation area of the reference ground.The measured-6dB impendence bandwidth of the antenna prototype is0.82?0.99GHz,1.66?2.84GHz,which covers the bands of the GSM850/900/DCS1800/PCS1900/UMTS/LTE2300/LTE2500 compeletly.The Antenna have merits of simple structure,wide frequency range,high gain compared with conventional antennas,and obtain good engineering application value.A miniaturized antenna of full netcom for POS terminal application is proposed.The antenna consists of planar monopole antenna and parasitic coupling stubs.The lower-frequency of the antenna is achieved by the coupling between E-shaped and short parasitic branch.The higher-frequency is accomplished by the fed E-shaped branch,inverted C-shaped branch and parasitic element,and the higher-frequency bandwidth is expanded effectively by using multimode microwave resonance of parasitic stubs.The total size of antenna is 61mm×30mm.The measured-6dB impendence bandwidth of the antenna prototype is 0,8?1.0GHz,1.45?2.90GHz,which covers the bands of the GSM850/900/DCS1800/PCS1900/UMTS/LTE2300/LT E2500compeletly.The antenna has merits of simple structure,wide frequency range and miniaturization.Meanwhile,it can obtain good Total Radiated Power(TRP)and Total Isotropic Sensitivity(TIS)performance for the specific POS terminal application,and gain the good value of engineering application. |
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