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Astudy on Base Station Omni-directionalantennas for MIMO Communications

Author: ShenShuangFeng
Tutor: BaoYaMing
School: Nanjing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: Omnidirectional antenna Printed dipole Bow-tie antennas Impedance equivalent model
CLC: TN828.6
Type: Master's thesis
Year: 2012
Downloads: 38
Quote: 0
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Abstract


With the development of communication and information technology , the number of mobile subscribers increased gradually , wireless communication resources gradually reduced . Based on the multiple-input , multiple - output (MIMO) communication technology IMT-Advanced system has a fast transfer rate , high spectrum efficiency to receive widespread attention . The base station antenna signal conversion device as a wireless system , its research has important practical significance . This study and designed to meet the system indicators base station omnidirectional antenna operating in four bands . This design printed dipole as a radiating element, arranged in the vertical plane and the horizontal surface constituting an antenna array . Printed media board sided parallel wire transmission line feed antenna array , the input of the gradient transmission line impedance matching . After a detailed analysis of the impact of the structural parameters of the performance of the antenna , the selection of the optimal parameter size to meet the target requirements . Due to the the butterfly antenna on the current current decay is slower than the rectangular oscillator , it has a wide band characteristic . The rectangle oscillator butterfly transducer instead butterfly oscillator able to work simultaneously on two frequency bands , to achieve the widening of the operating band of the antenna . Using the combined method of transmission line theory and circuit theory , this paper presents the design of the antenna impedance equivalent circuit model . The antenna array series feed , equivalent series circuit forms the circuit impedance element is the radiation impedance of each antenna element . Weak coupling between the antenna unit , the equivalent circuit model can be used to solve the impedance of the antenna array . The proposed antenna array and the impedance of the equivalent circuit model, the feasibility of providing the basis for the design of the antenna and the impedance matching .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > Antenna: zoning > Mobile communications antenna
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