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A novel method based on an artificial magnetic conductor (AMC) structure is presented to improve radiation performances of low-temperature co-fired ceramics (LTCC) antennas. A millimeter-wave (mmW) LTCC patch antenna using AMC structures is designed, achieving a wide bandwidth of 26%, a high gain of 8.27 dBi, and a high radiation efficiency of 86.2%. Based on the antenna element, an 4 4 array...
This paper presents a novel compact dual-band printed quadrifilar helix antenna (PQHA) for application in Compass Navigation Satellite System (CNSS) of China. This antenna is consisted of two quadrifilar helix elements that are arranged at inner and outer cylinder. It works at the B1 (1.561GHz) and S (2.492GHz) bands. Each four spiral arms is excited by a series feed network in equal magnitude and...
We investigate the performance of linear equalization combined with MLSE in long-haul transmission. In the nonlinear regime with high launch powers Q-factor improvement up to 1.4 dB is demonstrated with a quaternary state model.
N-InP/p-InAlGaAs/N-InAlAs light emitting transistors (LETs) operating at ~1.55 mum were investigated. Both carbon (C) and zinc (Zn) were used as the p-type dopant of the base layers. It was found that C stays in place while Zn diffuses into the emitter and the base active region, resulting in compromised electrical performance and light output intensity. On the other hand, due to a short minority...
The capabilities of the Dynamic Thermal Electron Quantum Medium FDTD (DTEQM-FDTD) model in simulating semiconductor media and devices are illustrated. Both transient and steady-state carrier dynamics, along with associated physical phenomena are obtained. Using the same computational model, the operational dynamics of a Fabry-Perot laser cavity are further illustrated.
The dynamic thermal electron quantum medium FDTD (DTEQM-FDTD) model is used to demonstrate ultrafast carrier dynamics in saturable gain and absorber media. The same model is then used to simulate a passive mode locked laser.
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