Ding-wang Yu

Bio: Ding-wang Yu is an academic researcher from National University of Defense Technology. The author has contributed to research in topics: Band-pass filter & Return loss. The author has an hindex of 2, co-authored 4 publications receiving 73 citations.

Y-junction power divider based on substrate integrated waveguide

Abstract: The substrate integrated waveguide (SIW) plays a very important role in millimetre-wave and microwave integrated circuits and systems with low return loss and high Q-factor. Also, the half-mode substrate integrated waveguide (HMSIW) has been developed in recent years. A new Y-junction four-way power divider is proposed by integrating the 90° Y-junction SIW power divider and HMSIW power divider. Simulated and measured results show that the return loss of the input port is below -15 dB over 8.6 to 12.2 GHz and transmissions are about -7.6 dB ± 0.2 dB in the passband. So, it makes the 6 dB power divider used preferably in a broad bandwidth. The new power divider can be produced in batches and can be widely used in millimetre-wave and microwave circuits owing to its simple and novel structure.

Design of an X-band symmetrical window bandpass filter based on Substrate Integrated Waveguide

Abstract: Substrate Integrated Waveguide (SIW) is a new kind of microwave transmission structure appeared in recent years. The SIW technique makes it possible that a complete circuit including planar circuitry, transition, and rectangular waveguide are fabricated in a planar form using a standard printed circuit board (PCB). From analysis of the susceptance of symmetrical window and designing process of Chebyshev bandpass filter in rectangular waveguide, an X-band filter based on SIW is designed and fabricated in this article. The simulated results show that the bandwidth of the filter is 5%. The insertion loss is about 1.4 dB, and return loss is about 25 dB at 10 GHz. The measured insertion and return losses are about 2.9 dB and about 13 dB, respectively at mid-band frequency. The filter has a small insert loss and good frequency selective performances from 9.82GHz to 10.20GHz. It is suitable for designing millimeter-wave circuits, and can be produced with batches to be widely used in the microwave systems with the simple structure.

A novel bandpass filter based on Half-Mode substrate integrated waveguide (HMSIW)

Abstract: A novel branched-shaped bandpass filter structure of Half-Mode substrate integrated waveguide is presented. By etching branched-shaped resonators with different patch size, wide pass-band is obtained, the filter was fabricated with a single layer standard printed circuit board process. The measured results are in good agreement with the simulated results, that indicates the correctness and effectiveness of the design. The bandpass filter structure has the advantage of low insertion loss, compacted and good selectivity.

Half-mode substrate integrated waveguide omnidirectional slot antenna

Abstract: A half-mode substrate integrated waveguide (HMSIW) omnidirectional slot antenna is proposed for the first time by integrating four narrow wall radiating slot antenna elements and a four-way power divider. The slot antenna element realises energy radiation from the open side of the HMSIW by etching several pairs of transversal slots both on the upper and the lower surfaces of the HMSIW and alternately arranging the slot pairs. A novel HMSIW four-way power divider is achieved to feed the slot antenna elements by loading four big metallic vias to guide the microwave into the HMSIW branches. This omnidirectional slot antenna has an efficiency of 86%, a gain of 5.8 dBi and an out-of-roundness of ±1.5 dB at 3 GHz, which makes it a good candidate for wireless communication applications.

Miniaturized Substrate Integrated Waveguide (SIW) Power Dividers

Abstract: In this letter, compact substrate integrated waveguide (SIW) power dividers are presented. Both equal and unequal power divisions are considered. A quarter-wavelength long wedge shape SIW structure is used for the power division. Direct coaxial feed is used for the input port and SIW-to-microstrip transitions are used for the output ports. Four-way equal, unequal and an eight-way equal division power dividers are presented. The four-way and the eight-way power dividers provide −10 dB input matching bandwidth of 39.3% and 13%, respectively, at the design frequency $\text {f}_{0}= 2.4$ GHz. The main advantage of the power dividers is their compact sizes. Including the microstrip to SIW transitions, size is reduced by at least 46% compared to other reported miniaturized SIW power dividers.

Single-Layer Dual-Band Balanced Substrate- Integrated Waveguide Filtering Power Divider for 5G Millimeter-Wave Applications

Abstract: A single-layer substrate-integrated waveguide (SIW) filtering power divider (FPD) with fully differential operation at 28 and 39 GHz is proposed in this letter. This FPD consists of three SIW cavities where the differential and common modes of each cavity were properly designed to form three-pole dual passbands, facilitate deployment of isolation resistors, and introduce transmission zeros while attaining high in-band common-mode rejection. To improve the output return loss and isolation in dual bands, a novel and simple approach to find the proper location of isolation resistors is presented. At operating frequencies, the measured differential-mode input or output return loss, minimum insertion loss, isolation, and common-mode suppression are >14.1 dB, 14.9 dB, and >30.3 dB, respectively. The amplitude and phase imbalances between outputs are < 0.48 dB and <4.2°, respectively.

Four-Way Filtering Power Divider Using SIW and Eighth-Mode SIW Cavities With Ultrawide Out-of-Band Rejection

Abstract: A four-way filtering power divider (PD) based on a substrate-integrated waveguide (SIW) is presented. This structure is composed of two layers of the dielectric substrate. The eighth-mode SIW (EMSIW) technique is used to make four cavities in the upper substrate. In addition, an SIW cavity is provided in the lower substrate. To achieve an efficient transition between the two layers, four rectangular slots are etched on the middle metal planes. A circular slot is etched on the top metal layer of the EMSIW cavities to suppress the higher operating modes. To prove the validity, a four-way PD with a second-order bandpass filtering response is designed and fabricated. The measured results show that the PD achieves an insertion loss of 1.3 dB at 3.5 GHz, a return loss of higher than 17 dB, a 3-dB fractional bandwidth of 7.75%, and an out-of-band rejection of greater than 26 dB from 3.92 to 16.5 GHz. The results show that this PD has the advantages of compact size, high selectivity, and ultrawide out-of-band rejection.

A novel power divider integrated with siw and dgs technology

Abstract: In this paper, a novel power divider integrated with substrate integrated waveguide (SIW) and defected ground structures (DGS) techniques is proposed to provide both power dividing and flltering functions. The SIW technique holds advantages of low proflle, low-lost, mass-production, easy fabrication and fully integration with planar circuits. By integrating with defected ground structures (DGS) technique, the size and cost of system can be efiectively reduced as the proposed power divider has a function of flltering which leads to reduction of one fllter. In order to verify the design approach, the proposed power divider with equal power divisions at the center frequency of 8.625GHz is fabricated and measured. The measured results demonstrate that the insertion loss is less than 1.2dB and the input return loss less than 16dB across the bandwidth of 1.4GHz (FBW is 16%). Moreover, the imbalances of the amplitude and phase are less than 0.3dB and 0.5 degree, respectively.

Wideband SIW power divider with improved out-of-band rejection

Abstract: A wideband substrate integrated waveguide (SIW) power divider with enhanced out-of-band rejection is proposed. Periodic butterfly radial slots are etched on top layer of SIW to realise a pass-band combining with high-pass characteristics of SIW. An experimental circuit has been fabricated by the standard printed circuit board process. Simulated results are compared with measured data and good agreement is reported.