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This paper presents a 2.4GHz 10-inch tablet computer antenna design on IPD process. The antenna radiation efficiency and miniaturized area are optimized by metal region and clean region. The metal region comprises μm gap between the open radiating strip and the short grounded strip. The miniature 10mm × 10mm antenna area can provide 1.25dBi peak gain and 80% radiation efficiency for WLAN 2.4GHz tablet...
A low-noise low-power direct conversion receiver with a differential RF VGA is demonstrated using 0.18um CMOS technology. A topology that uses a differential inductor load for a differential RF VGA is employed for the single-to-differential conversion. Since the common-mode rejection ratio of a differential variable gain amplifier is increased by the mutual magnetic coupling in a differential inductor...
In this paper, a novel diplexer with a common square ring resonator for WCDMA system is proposed. A square ring resonator is perturbed by a square patch, and two degenerated modes are excited. Each mode is designed for an individual channel of the diplexer. Then two hairpin resonator is designed and coupled to the common dual-mode resonator. In order to improve the coupling between common resonator...
This paper investigates the radial inserted permanent magnet magnetic coupling design based on additive manufacturing (namely 3D printing). 3D printing prevents the use of adhesives or rivets in the manufacturing process of integrating the main structure; thus, the flux leakage is cut down compared with traditional magnetic coupling. Likewise, a honeycomb structure is applied to the shoe parts of...
In the past decade, a number of interesting designs have been proposed to generate artificial magnetism at optical frequencies using plasmonic metamaterials, but owing to the planar configurations of typically fabricated metamaterials, the magnetic response is mainly driven by the incident electric field. Here, we fabricated vertical split-ring resonators (VSRRs) which behave as magnetic metamolecules...
We present vertical split-ring resonators (VSRRs) which behave as magnetic metamolecules sensitive to both the incident electric and magnetic fields upon excitation. A couple of potential applications such as VSRR-based highly sensitive refractive-index sensor and metasurface for light manipulation in optical communication frequency will also be demonstrated.
A novel distributed multi-fiber side coupling scheme was integrated on single laser diode stack (LDS) by using the grating coupler. The launched power was 100.2 W from a 231.6 W continuous-wave LDS at 976 nm.
This paper presents a new method for improving the positioning precision of micro-assembly system. The spatial positioning precision is extremely requested for the micro-manufacturing applications. Therefore, develop an optimum method to improve the positioning precision and become the important issue for micro-manufacturing. In this paper, an effective method that combines the B-Spline command generator...
A sub-wavelength gold-embedded silica binary grating for side coupling light emission from a 976-nm high-power laser diode array into the 400-μm-diameter inner cladding of a double-clad fiber was demonstrated with near 50% overall coupling efficiency.
Genetic algorithms and the descendant methods have been deemed robust, effective, and practical for the past decades. In order to enhance the features and capabilities of genetic algorithms, tremendous effort has been invested within the research community. One of the major development trends to improve genetic algorithms is trying to extract and exploit the relationship among decision variables,...
A polarization independent grating coupler for coupling the light from an optical fiber into a silicon-on-insulator (SOI) waveguide with a coupling efficiency independent of the polarization of the incident light was proposed. Such a polarization independent grating coupler can be achieved by superimposing the grating couplers which were originally designed for coupling solely the TE and the TM modes...
Resonances degrade the product's EMI or immunity performance at resonance frequencies. Near field scanning techniques, like EMI scanning or susceptibility scanning determine the local behaviour, but fail to connect the local behaviour to the system level behaviour. Resonating structures form part of the coupling paths, i.e., identifying them will aid in understanding system level behaviour of products...
Electrostatic discharge (ESD) can cause interference or damage in circuits in many ways e.g., by E- or H-field coupling or via conduction paths. Although we can roughly estimate the voltage and current at the injection point during an ESD event, the real offending parameter is mostly the ESD current spreading throughout the system. Those currents can be simulated if great simplifications of the system...
Memory cores usually occupy a significant portion of the chip area of a complex system-on-chip. Thus, the yield of memory cores dominates the yield of the chip. Diagnosis and repair are two important techniques for memory yield improvement. In this paper, we propose two efficient diagnosis algorithms for drowsy static random access memories (SRAMs). The first diagnosis algorithm, March D2, can be...
This paper demonstrates a trifilar-coupling QVCO with two coupling paths provided by the trifilar transformers. These two coupling paths achieve the output voltage swing optimization and the quadrature signal generation, respectively. Consequently, the trifilar-coupling QVCO using 0.35-mum SiGe HBT technology achieves the 188-dBc/Hz FOM at a 2-V supply.
The steam and water system of boiler is always divided into a drum level control system and a main steam temperature control system independently. The coupling is existed actually between these two loops, but it is often ignored by engineer or system designer. In this paper, the coupling between the drum level control system and the main steam temperature control system is determined by the controlled...
A trifilar-coupling quadrature voltage-controlled oscillator (QVCO) is demonstrated using 0.35-mum SiGe heterojunction bipolar transistor (HBT) technology. The trifilar transformer consisting of one primary coil and two secondary coils is used in this work to separate the collector and base bias for output voltage swing optimization and also to replace a conventional transistor-coupling method for...
A slot waveguide directional coupler-based polarization splitter designed on SOI platform is proposed and analyzed. The geometry of the slot waveguide directional coupler allows significant birefringence for the polarization splitting to be achieved with a suitable design. The polarization splitting in an SOI waveguide device as short as 30 mum can be realized.
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