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Wireless sensor network (WSN) is a new research field developed in recent years, and its applications are drawing more and more attention of military, industry and academe. Such a research has both significant theoretic values and wide potential applications. The issue of wireless sensor network energy saving should be cause for concern primarily. But(More)
CTS (Continuous Transverse Stub) antenna radiates electromagnetic wave with its transverse stubs on transmission line, and its pattern in horizon plane is omnidirectional. This paper proposes a novel coaxial CTS structure, in which a monopole is applied in coaxial CTS antenna, instead of a matching load. This method may not only improve the radiation ratio,(More)
Log-periodic dipole antenna (LPDA) is a kind of frequency-independent antennas which is widely used. The design theory of the antenna is already mature. Although we can design the antenna with the best characteristic through the design theory, the size of the antenna is usually too large to be used. In this paper, we firstly establish the model of an(More)
In this paper, a new millimeter-wave transmit/receive antenna module for radar sensors was proposed. This antenna was designed operating at 24 GHz and intended for obstacle detection and short-range automotive applications. The transmitting part was implemented by a microstrip array antenna with 48-elements and improved with the concern of nonhomogeneous(More)
In order to release the increasing pressure of traffic flow in metropolises, this paper introduced a method of using high sensitivity microwave radiometric systems to monitor the traffic flow in all-weather conditions. In this method, radiometers were employed to detect and recognize the automobiles on the roads based on different behaviors of the(More)
Recently there is a big concern for the passive intermodulation (PIM) problems of wireless system. The PIM models, the general mathematic nonlinear models, especially those based on physical mechanism, are investigated in this paper. The network models for microwave systems are finally studied. The PIM suppression or mitigation methods are provided based on(More)
A new plasma monopole antenna is proposed in this paper. The cylindrical plasma antenna is fed by a metal ring. The impedance characteristics and radiation characteristics of the plasma antenna are calculated and analyzed. According to actual situation, a cylindrical plasma monopole antenna is designed and measured. The measurement results are similar to(More)
In this paper, a video wireless transmission system based on DVB-T is introduced with the DM642. Based on this system, the packing-unpacking TS stream device is designed in DSP, and the method to output TS stream by means of using EDMA, GPIO and serial peripheral interface (SPI) is proposed. This method which has been proved is an effective solution to(More)
The passive intermodulation (PIM) interference caused by antenna nonlinearity has a serious impact on the performance of the high power multi-frequency communication system, especially when the antenna is shared by the transmitter and the receiver at the same time. Theoretical analysis on the PIM was first discussed in this paper, and then the designed(More)
Production and application electromagnetic Pulse is paid more attention home and aboard. A novel switch-type exploding electromagnetic pulse generator is put forward in this paper. Based on its equivalent circuit theory, mathematics model is given and calculate. By proper parameter and structure design and optimize, this model can increase the(More)