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In this paper, two compact microstrip filters using open-loop resonators are presented. The first one is a single-band filter designed at 5.2GHz with a fractional bandwidths of 7.5%, and the second one is a dual-band filter operating at 2.4GHz and 5.2GHz with fractional bandwidths of 10% and 9%, respectively. The effective sizes are reduced by using multilayer liquid crystal polymer (LCP) technology...
In this paper, synthesis and design of hybrid-shaped cavity filters using substrate integrated waveguide (SIW) technique is proposed. Both triangular - and rectangular SIW cavities are combined for the first time in the design of band pass filter. Cross-coupling structures are realized in both proposed filters via two or three propagation paths. Measured results are presented and compared to those...
A novel umbrella-like structure is proposed with cap and additional plasmonic gold pillar blocking the nanohole arrays. We observed that the transmission efficiency is not reduced while the nanohole is blocked though the total light transmission area is reduced due to the additional gold pillar inside the hole. It can realize a giant transmission efficiency in the order of 87% that is much larger...
In this paper, a comprehensive study of different level hot carrier stress conditions for N-type symmetrical lateral double diffused MOS (ns-LDMOS) is carried out. It is noted that there are two peaks bulk current observed for different gate voltage due to Kirk effect happening. The experimental results show two turn-over of Idsat degradation with low Vgs (mainly caused by impact ionization current...
A broadband circularly polarised square slot antenna fed by a coplanar waveguide (CPW) from a corner of the slot is proposed. A checkshaped strip with its vertex connected to the protruded signal strip of the CPW is used to achieve circular polarisation. The measured 3 and 1 dB axial ratio bandwidths are 48 and 21.3%, respectively, and the input impedance bandwidth (|S11|⩽-10 dB) is 73.9%, which covers...
Several practical issues associated with achieving effective impedance performance in the finger joint space and stable grasping on a five-fingered dexterous hand are investigated in this work. A Multiprocessor structure based on field programming gate array (FPGA) is proposed to realize the high-level hand impedance controller. The key feature of the hardware system is a dual-processor architecture...
A position-based joint impedance controller and a DSP&FPGA-based multilevel control structure were developed to improve the capabilities of robot hand performing task in a variety of environments. Based on finite element analysis technologies, the new torque sensors and giant magnetoresistance (GMR) position sensors were designed and applied, and meet the challenge of joint torque measuring and...
This paper presents a new developed multisensory five-fingered dexterous robot hand: the DLR/HIT Hand II. The hand has an independent palm and five identical modular fingers, each finger has three DOFs and four joints. All the actuators and electronics are integrated in the finger body and the palm. By using powerful super flat brushless DC motors, tiny harmonic drivers and BGA form DSPs and FPGAs,...
This paper presents a new developed multisensory five-fingered dexterous robot hand : the DLR/HIT Hand II. The hand has an independent palm and five identical modular fingers, each finger has three DOFs and four joints. All the actuators and electronics are integrated in the finger body and the palm. By using powerful super flat brushless DC motors, tiny harmonic drives and BGA form DSPs and FPGAs,...
A novel GalnNAs/AlAs/AlGaAs double-barrier quantum-well-infrared-photo-detector was characterized by photoluminescence, x-ray diffraction, photoluminescence excitation, photocurrent spectra and dark current measurements. The photoluminescence peak at ~1.2 eV and the photocurrent peak at 1.24 mum originate from the interband transition and inter-subband transition, respectively, in the GalnNAs well...
In this paper, we developed a performance-enhanced, stand-alone dexterous robot hand with effective mechanical structure and lightweight control hardware. In the context, the paper shows the design methodology of HIT/DLR dexterous robot hand II controller using FPGA (field programmable gate array). Lower level controller is implemented in an FPGA and higher level controller is implemented in a DSP...
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