Yuandan Dong

Half Mode Substrate Integrated Waveguide: A New Guided Wave Structure for Microwave and Millimeter Wave Application

In this paper, a new guided wave structure of half mode substrate integrated waveguide (HMSIW) for microwave and millimeter wave application is proposed for the first time. The principle of the HMSIW is described, and its propagation characteristics are simulated and measured. The measured results at microwave and millimeter wave bands show that the attenuation of it is less than that of conventional microstrip and even SIW, but its size is nearly half of a SIW. Thus, we can further compress the size of a microwave or millimeter wave integrated circuit based on this new guided wave structure.

Half Mode Substrate Integrated Waveguide (HMSIW) Bandpass Filter

This letter presents the design and experiment of the half mode substrate integrated waveguide (HMSIW) bandpass filters. Three-pole and five-pole HMSIW filters are simulated by using CST software and fabricated with a single layer standard printed circuit board process. Different external-coupling approaches are adopted in the design of the two filters. The measured results are in good agreement with the simulated results. Low insertion loss and good selectivity are achieved

Analysis of Planar Ultrawideband Antennas With On-Ground Slot Band-Notched Structures

Planar ultrawideband (UWB) antennas with on-ground band-notched structures are studied in this paper. Two different slot resonators, which feature quarter-wavelength and half-wavelength configurations, are embedded into the arc shaped ground plane of the circular disk patch antennas in order to obtain the desired band-rejection around 5.8 GHz. Their principles and characteristics are analyzed and compared in detail providing designers with in-depth understanding and useful design information. By choosing the quarter-wavelength slot resonator, the first spurious stopband can be pushed up to 3 f 0 (f 0 stands for the center frequency of the notch) and this antenna retains a super wide working band which spans from 1.62 GHz to 17.43 GHz. Performance in both the frequency domain and time domain for this antenna has been investigated carefully. The transmission response of a transceiving antenna system and their corresponding transient analysis are discussed at the end of this paper.

Development of Ultrawideband Antenna With Multiple Band-Notched Characteristics Using Half Mode Substrate Integrated Waveguide Cavity Technology

Investigations on planar ultrawideband (UWB) antenna with multiple band-notched characteristics based on half mode substrate integrated waveguide technology are presented. The proposed antenna consists of a planar UWB monopole antenna and a half mode substrate integrated waveguide cavity which can generate multiple stopbands by proper arrangement. Planar antennas with dual, triple and quadruple notched bands are designed and implemented. The notched frequencies and their bandwidths can be adjusted according to specification by altering the cavity and feed line independently. These antennas are fabricated with two-layer printed circuit board (PCB) process. Sharp and high band rejection, narrow frequency notches are achieved, which are in good agreement with the simulated results. This technique is suitable for designing wideband antenna with multiple frequency notches or for creating multiband antennas.

Compact ultra-wideband antennas with multiple notches

In this paper, the compact ultra-wideband (UWB) antenna with multiple notches (stopbands) is implemented based on a back loaded multi-modes substrate integrated waveguide (SIW) cavity and associated with L-type resonators. Three sharp notches at 2.4 GHz, 3.5 GHz and 5.8 GHz are achieved in simulation and also experiment, which can then be applied in the UWB communication systems with the anti-jamming ability or low interference ability to other wireless systems, such as the 2.4 GHz WLAN, 3.5 GHz WiMax or 5.8 GHz WLAN etc.

UWB Bandpass Filter with Multiple Frequency Notched Bands

In this paper, an Ultra-Wide Band (UWB) bandpass filter with multiple frequency band-notched characteristics is investigated. The filter is realized by combining a series of coplanar waveguide (CPW) periodic structure (PS) etched on the surface of a substrate integrated waveguide (SIW) with some split ring resonators (SRRs) placed near the input or output feed lines. The prototypes of UWB (5 GHz-10.5 GHz) bandpass filters with two and three notched bands are implemented and measured. The measured data are in agreement with the simulated results.

Band-notched ultra-wideband antenna designed and optimized by current distribution analysis

A novel ultra-wideband (UWB) antenna with two frequency notches is designed and implemented. Current distribution analysis is used to optimize the performance. Three examples are presented to validate the analysis. It is shown that by investigating the current distribution of the antenna, we can clearly find how to place a tuning stub to obtain the band-notched function.

Measurement and characterization of wideband channel for in-vehicle environment

This paper presents the results of wideband channel measurement campaigns conducted in vehicle environment. A frequency range of 0.5 – 16 GHz was measured using a vector network analyzer. Typical in-vehicle scenarios, including line-of-sight (LOS), non-line-of-sight (NLOS), different distance, impact of passengers, were considered. The objective of this work is to obtain a better assessment of the potentials of in-vehicle communications by characterizing the wideband in-vehicle communication channels. Results showed that the energy arrives in clusters, and that the abundant scatters and absorber caused dense multipath scattering. Further analysis of the results showed the power delay profile could be basically modeled by a Saleh-Valenzuela (S-V) model. It is also noticed that delay spread and thus the coherence bandwidth depended only slightly on the distance, mainly on the structure of the car interior and layout of the passengers.

Compact Ultra-Wideband Antenna with Multiple Stop Bands

In this paper, some recent research advances in compact ultra-wideband antenna with multiple stop bands for UWB wireless communications or shared for multiple wireless communication systems are reviewed.

A Novel Millimeter Wave Substrate Integrated Waveguide Filter Using TE 301 Mode Cavities

A novel millimeter wave filter based on substrate integrated waveguide (SIW) technology is presented. TE301 mode cavity is used in the design in order to improve the quality (Q) factor of the filter. Some corrective measures are taken to compensate for the unsymmetrical transmission response produced by parasitic coupling from the non-resonant mode. Measured results show that the stopband rejection of this filter is better than -45 dB. Sharp transition characteristic in both the lower side and the upper side demonstrates high selectivity of this filter.