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In order to study the ship navigation deflection, the motion model of the ship is established on the basis of CFD (computational fluid dynamics), for the numerical calculation and simulation of the motion state of S60 ship model in different water depths. Meanwhile, the calculation result is compared with the experimental data for verification, and it turns out that the two matches well. Afterwards,...
In this paper, balanced bandpass filter (BPF) with controllable dual passband performance is presented. Based on the voltage distribution of traditional half-wavelength resonator, the stub-loaded theory with independently controlled differential-mode resonances is presented and applied to design dual-band balanced BPF with independently controlled passband locations. Then, except for the main coupling...
This presentation overviews recent advances in the designs of low profile circular patch antennas with monopole like radiation patterns. This type of antennas can provide omnidirectional radiation patterns in the azimuth plane. Techniques for the enhancement of the bandwidths are discussed. The antennas can be designed for linear and circular polarizations.
This paper introduces a broadband and compact output combiner for Doherty power amplifier. A grounded quarter-wavelength QJA) line is added to the output of the peaking amplifier, which helps to compensate the bandwidth limiting effect happened in the conventional combiner. Frequency response analysis indicates that stable impedance is achieved across a wide band for the carrier PA. For demonstration,...
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