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The design approach of a loop-dipole combined antenna for wearable applications is proposed. In order to mitigate the antenna's performance deterioration caused by the human body, additional loops are incorporated with a wideband dipole. The loops can i) widen the impedance bandwidth by minimizing the reactance of the antenna, ii) increase the antenna's directivity and iii) act as wearable accessories...
A novel, dual-mode planar circularly polarized (CP) antenna with an end-fire radiation beam in parallel with its plane is proposed and numerically investigated. The antenna consists of an aperture and a printed dipole. A pair of stubs are unilaterally loaded along the dipole, and used to generate a dual-mode radiation characteristic. As simulated, it is observed that the impedance bandwidth (20log|S11|...
A complementary antenna for wearable applications is proposed. By introducing a loop-monopole combined structure, unidirectional beam is obtained and the interaction between the antenna and the human body can be potentially mitigated. The antenna's operation principle is analyzed and validated at first. Then, prototypes are designed and measured. When the antenna is placed in free space, an impedance...
A planar wideband balanced antipodal dipole element is proposed. It consists of two parallel printed dipole elements with a balanced antipodal structure. By properly choosing the separation between the dipoles and the length of them, a unidirectional radiation pattern is achieved. Prototypes are fabricated and measured. It is shown that an impedance bandwidth from 4.2 to 13.5 GHz about 105.1% is achieved...
A dual-frequency rectifier with adaptive power is proposed for the rectenna of a microwave power transmission system. It operates at 900MHz and 2.4GHz (GSM and ISM bands) on a wide and low input power condition. A FET works as an adaptive switch for changing the working modes of the rectifier according to the level of the input power. A cross-shaped match stub matches the two impedances of the diode...
The channel impulse response (CIR) under indoor stair environment is modeled. In this model, the amplitude and phase of the CIRs are described as Weibull and uniform distributed random variables, respectively. The CIRs can be simulated using the proposed model. Then, Orthogonal Frequency Division Multiplexing (OFDM) communication system is implemented on the measured and simulated channels. Based...
The genetic variation information file of glycine max is adopted as experimental data in this paper. The genetic variation information of soybean is processed and the corresponding algorithm is paralleled by the OpenMP parallel technology. The experiment extracted the corresponding biologic information of population individuals from genetic variation information, implemented corresponding process...
Soybean genotypes are adopted as the data source and the Tajima's D statistical method is parallel implemented by OpenMP technology. This method is used for testing neutral mutation hypothesis of DNA polymorphism. By setting the sliding window size, all chromosomes containing the massive windows with multiple SNP sites are parallel processed, then the number of individual in sample, the number of...
Based on the inverse effect of magnetic controlled shape memory alloy (MSMA), a vibration sensor, which can convert mechanical signals into electrical signal, is developed, and an induced voltage model of vibration sensor is proposed in the paper. Induced voltages are calculated respectively when excitation force has different frequency and amplitude, the calculated values is agreed with the measured...
We report single output tunable DFB semiconductor laser arrays in series and grating-matrix configuration designed by reconstruction equivalent chirp (REC) technique. By using interference lithography and photolithography for the grating fabrication, tunable laser arrays with good performance are experimentally realized with low cost.
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