Luan Xiu-zhen

Millimeter wave circularly polarized substrate integrated waveguide antenna

A millimeter wave circularly polarized substrate integrated waveguide antenna is proposed. The proposed antenna is constructed by a quasi H-type radiating slot on the broad wall of a substrate integrated waveguide and the microstrip stepwise input and output impedance matching networks. Analysis and design approaches are given in the paper. With the help of the electromagnetic simulator, a circularly polarized antenna operated at Ka-band is designed. The designed results show that the centre frequency of the antenna is 30 GHz, the circularly polarized axial ratio at 30 GHz in the main beam direction is 0.36 dB, the 3 dB circularly polarized axial ratio bandwidth is 1.35 GHz, the -10 dB return loss bandwidth is 350 MHz.

Analysis and optimization design of compact microstrip patch antennas loaded with shorting pins

Based on the cavity model method, which proposes a theoretical analysis method for rectangular microstrip patch antennas loaded with shorting pins, we calculated the input impedance and return loss performance of a rectangular patch antenna loaded with a single shorting pin and a rectangular patch antenna loaded with two shorting pins. The calculated results were then compared with each other. Based on this analytical method, and using an optimization technique, we proposed a design method for this type of antenna, and designed a rectangular patch antenna loaded with a single shorting pin which meets mobile communication demands both in operating frequency and impedance.

Ultra-wideband bandpass filter based on ridged substrate integrated waveguide

A novel ridged substrate integrated waveguide bandpass filter for ultra-wideband application was proposed and designed in the paper. The bandpass filter was made up of ridged cavity resonators coupled by sections of stripline on the substrate in evanescent waveguide. In order to get ultra-wideband frequency responses, ridged substrate integrated waveguide structure and lower permittivity substrate were used. With the help of electromagnetic simulation software, the bandpass filter was designed. The designed results show that the -10dB return loss bandwidth of the bandpass filter is from 3.3GHz to10.7GHz, and good transmission frequency response is also obtained. The bandpass filter has lower loss, suits to be used in the ultrawideband integrated circuits.

Design of Pan-Camera Decoder in Digital Video Monitoring System Based on Embedded Microcontroller

This paper presents the design method of pan-camera decoder applying in digital video monitoring system including software and hardware. This decoder was based on embedded microcontroller C8051F330 and was mainly composed of regulated power supply circuit, serial communication interface circuit, watching dog circuit, input/output alarm circuit and pan-camera control circuit. It is connected with the UP computer by RS-485 serial communication protocols. This decoder can realizes the pan-camera automatic control, including pans up, down, left, right, level rotation movement and cameras focus, zoom, iris adjustment. Experimental results show that this decoder operates reliability and accurately.

A novel ridge substrate integrated waveguide antenna for WLAN application

A novel ridge substrate integrated waveguide slot array antenna for WLAN application is proposed and designed. In order to make substrate integrated waveguide work at lower frequency, a wide ridge which is made of two linear metallic via arrays and a metallic strip on the top of metallic via arrays is inserted in the longitudinal centerline of a substrate integrated waveguide. The wide ridge is equivalent to a solid metallic ridge. Based on the equivalent width analytical formula of substrate integrated waveguide, the calculating method and formula of equivalent ridge width are given in the paper. Two longitudinal slots are cut on the top of ridge substrate integrated waveguide to form an antenna for WLAN application. With the help of electromagnetic simulation software, the antenna is designed. The designed results show that the central frequency of the antenna is 5.2GHz, −10dB return loss bandwidth is from 5.12GHz to 5.345GHz, the maximal gain at 5.25GHz is 17.017dB, very suitable to WLAN application.

Effects of shorting pin on the Substrate Integrated Cylindrical Cavity

Substrate Integrated Cylindrical Cavity (SICC) can be used to design compact planar circuits. For the same size, SICC loaded with shorting pin can resonate at higher frequency than no shorting pin SICC. This property can be used to implement the millimeter wave circuits. In this paper, the effects of shorting pin on SICC are analyzed theoretically. With the help of electromagnetic simulation software, the effects of shorting pin position, radius and number on the resonant frequency of SICC are studied. Some results and conclusions are given in the paper, they will be useful for the SICC based millimeter wave device design.

Research on small circular microstrip patch antenna

The probe-fed circular microstrip patch antenna incorporating a single shorting post can significantly reduce the overall size of the antenna. This kind of antenna is seen as a promising candidate for miniaturized mobile telecommunication handsets. In this paper, an analytical theory for the impedance behaviour and radiation characteristics of the small circular patch is presented; the theoretical results agree with the experimental ones very well.

Mistracking detection on-line with spline wavelet and its characteristic analysis

This paper represents a mistracking detection method with wavelet transformation in marine radar processing. The data of the crossing targets are separated by means of the Lipschitz exponent when the tracking gates are aliasing. The real-time wavelet decomposition is derived and employed in the extraction of the local Lipschitz exponent to get a better property of real-time processing. It is demonstrated that the mistracking detection algorithm with the spline wavelet is accurate for the step edge of a time series and is unbiased under the situation of both additive and multiplicative noise.