Deqiang Yang

A novel teaching platform design with CAI for EM education

Computers and multimedia technology can greatly facilitate the visualization of abstract concepts and intangible objects such as electromagnetic waves. An educational design platform is proposed to assist undergraduate students in understanding these waves. At present, most electromagnetics courses still use traditional teaching design ideas, from mathematics to reason, and spend much time on formula deduction. Educational design overturns this idea thoroughly to learn with problems and solve experiments related to uncertain concepts; this design will help undergraduate students learn the basic characters of electromagnetic waves intuitively and more easily. Through the experiment‐simulation method, students can experimentally sample data and process data real‐time using simulation software. In this way, students can grasp the physical meaning of abstract concepts more accurately through experiments; furthermore, computer simulations can show the relationships between parameters more intuitively. Thus, the original intention of teaching aided design is exactly reflected: “see knowledge and learn knowledge.”

A Miniaturized Antenna by Loading Curved Branches for UWB Applications

In this paper, a compact Vivaldi antenna with a pair of curved branches is proposed. Compared to the traditional Vivaldi antenna, by adding a pair of curved branches, an additional resonant frequency is added in the low frequency band, and the bandwidth edge of the antenna at the low frequency band extends to 2.45 GHz, and the sidelobe level of the radiation pattern is reduced. In the operating band, the gain of the antenna is also improved a lot. In order to verify the validity of this proposed design, the proposed antenna model was fabricated and measured. The measured results show that this proposed antenna can cover a wide operating bandwidth of 2.45 GHz–11.5 GHz in a compact size of 30 mm × 36 mm and achieve good directional radiation characteristics. In the operating band, the measured gain is higher than 4 dBi. In addition, the measured group delay of this antenna is around 1.6 ns, and its variation is less than ±0.5 ns.

The Design of Multiband Semicircle Fractal Antenna Applied in the Wireless Communication

In this letter, a multiband communication antenna is presented. It is iterated a semicircle fractal structure to formation and achieved four resonant frequency. The overall size of the proposed antenna measures 30 × 32 × 0.50 mm3. The multiple iterated semicircle fractal antennas can be applied in multiple communication frequencies of the 2.3, 2.8, 4.1, 9.1 GHz at the same time. Using fractal structure design of fractal antennas not only can achieve the purpose of miniaturization, but also can satisfy the antenna work in multiple frequencies, have the ability to make communication more convenient.

A NOVEL MINIATURIZED VIVALDI ANTENNA FOR ULTRA-WIDEBAND APPLICATIONS

A novel Vivaldi antenna utilizing a tapered slot edge with a stepped structure (TSESS) to achieve miniaturization is presented in this paper. Compared with a conventional Vivaldi antenna of the same size, the proposed TSESS significantly extends the low-end bandwidth limitation and also improves the low-end antenna gain and radiation characteristics. The proposed antenna is fabricated and tested for validating the reliability of the design. The measured results show reasonable agreement with simulated ones. Moreover, a good time-domain response is indicated from the measured group delay, showing that the antenna meets the requirements of a UWB system.

A Compact Single-Layer Substrate-Integrated Waveguide (SIW) Monopulse Slot Antenna Array

In this study, a compact single-layer substrate-integrated waveguide (SIW) monopulse slot antenna array is designed. The antenna has a very simple structure and uses SIW-based cavity resonators, instead of a complex feeding network and monopulse comparator, to excite the slot array. The design decreases the size of the feeding network and monopulse comparator by applying cavity resonator principles to the monopulse slotted antenna array, resulting in an obvious improvement of the antenna aperture efficiency and structure complexity. This single-layer scheme, combined with a planar transmission line, is ideal for integration with planar circuits. A 16-element slot array prototype operating at 5.83 GHz is fabricated through a low-cost standard printed circuit board process to validate the design. The simulated and measured results are presented, and good agreement between them is obtained.

Research on pyramidal horn antenna using integrated optical E-field probe

In order to reducing the interference. A novel electric field probe utilizing integrated optical waveguide is designed for pyramidal horn antenna in this letter. The new optical probe detects the E-filed vector in the pyramidal horn and converts the field into light signal. Compared with the traditional probe, this design has the advantages of less interference on E-field, low transmission loss (0.2dB/km) and high immunity to electromagnetic interference. The principle and fabrication process of the optical probe are given. Experimental results show that the probe is very suitable for applying in pyramidal horn antenna.

Time-divided multi-channel technique for EM-TRM based object detection system in complex environment

Due to its so called “super resolution” characteristic, EM-TRM algorithm attracts much attention lately. However, research on practical object detection system based on EM-TRM algorithm is still in its early stage. This paper presents a time-divided multi-channel technique. Based on this technique, a low cost practical system for object detection in jungle area is then developed which includes system hardware components and software modules. Experiment results show that this EM-TRM time-divided multi-channel system yields good focusing both in single target test and multiple targets test.