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Research on the Passive Wireless Temperature Sensor Hardware System Using Passive SAW Resonator

Author: WangJunFeng
Tutor: LiPing
School: Chongqing University
Course: Instrument Science and Technology
Keywords: Single-port SAW resonator Passive wireless sensor Antenna miniaturization Helical antenna antenna parameters Resonant frequency
CLC: TP212
Type: Master's thesis
Year: 2004
Downloads: 366
Quote: 5
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Abstract


SAW sensor has the advantage of passive wireless sensing, can be used for fast-moving objects, such as non-contact measurement of rotating objects. Framework of a passive wireless temperature sensing system based on SAW resonator. Main system hardware, the resonant frequency of the antenna design and antenna parameters. This selection of single-port SAW resonator as the sensing element. Single-port SAW resonator structure and temperature sensing principle is introduced, and constitute a summary based on the single-port SAW resonator structure or the traditional sensing system hardware. Optional sinusoidal burst by analyzing the resonator response to the different excitation signal as the excitation signal, overcomes the pulse signal as the excitation signal when there is low efficiency and the sensing distance near disadvantages. For systems using dual conversion constitute a complex circuit structure shortcomings posed by traditional systems analysis, this paper, single-conversion systems constitute program. System design also uses additional band-pass filter, to improve system isolation and AGC amplification technology tools to enhance the detection distance. The experiments validate the feasibility of the system design. Electronic circuits from the high-frequency electromagnetic compatible design principle, electromagnetic compatibility design system. The paper describes the specific design of the entire hardware system. Given in the realization of the antenna system, i.e. base antenna (the antenna connected to the system referred to as a base antenna) and mobile design of the antenna (the antenna connected with the resonator called mobile antenna). The base antenna half-wave oscillator to achieve due to the requirements of the work environment; mobile antenna miniaturization antenna. The chronological design to achieve a two miniaturized antenna: a short dipole antenna; alternative the dipole antenna rallying achieve the spiral structure of the antenna is a helical antenna. In the same axial dimensions, and the helix structure of the antenna to increase the effective length of the antenna to achieve the purpose of improving antenna efficiency. To achieve a good match of the base antenna and transmission lines, the moving antenna and the resonator. Comparing two small antenna, in the same test conditions, designed to achieve the spiral structure of the antenna exhibits a better performance than the short-dipole antenna, the experimental results show that the helical structure antenna amplifier average output power of O.15W detection distance, can be achieved over 6m short dipole antenna detection distance of only 2m. The mobile antenna parameters change the resonant frequency of a preliminary analysis. Since the resonant frequency will be influenced by the impedance of the antenna, therefore, the use of different mobile antennas and resonators matching connection, in the case of the same with other detection conditions, the resonant frequencies are different; simultaneously the face of the impedance of the antenna is also an impact, when changing the height of the level of the mobile antenna, in the case of the same with other detection conditions, the resonant frequency will change.

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