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There is strong recent interest in exploiting the millimeter wave (mmWave) frequencies for cellular communication. For signal transmission studies, one needs a channel model that can simulate the spatial variation of mmWave channel impulse responses (CIRs) in treated operating environments. We consider reconstruction of spatially varying CIRs by interpolation over a set of existing CIR snapshots for...
Second-harmonic generation of ultrashort pulses in the sufficiently chirped quasi-phase-matching (QPM) gratings is shown to obtain conversion efficiency approaching 100% with increasing pump intensities, and the wide bandwidth of the pulses is also preserved.
The authors report the fabrication of high-performance planar InGaAs P-I-N buried heterostructure photodetectors (BH-PDs) by introducing mesa etching and refilling with semi-insulating InP. It was found that measured 3-dB bandwidth for the fabricated BH-PD was 12.4 GHz. For a given bandwidth of 1 kHz and a given bias of -5 V, it was found that noise equivalent powers our InGaAs P-I-N BH-PD were 6...
A novel design of a printed ring-slot antenna with circular polarisation (CP) is first proposed. The CP radiation of the slot antenna is achieved by a series microstrip-line feed configuration. Using the single CP slot antenna as an array element, the 1times2 and 2times2 slot arrays are constructed and measured. To obtain wider CP bandwidth, phase sequential rotation technique is applied to the feed...
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