Ice accretion on stratospheric airships, which affects the net buoyancy and reduces the ascent speed, thereby leading to component failure and further necessitating flight termination, has received considerable attention. In this study, the formation of ice occurred when the airship hit supercooled water droplets during the non-forming ascending process. Theoretical descriptions of an ice accretion model, a thermal model, and a dynamic model for airships were established to estimate the flight performance with ice mass. Then, validation of the simulation and the cloud chamber test was carried out, which indicated that the temperature, liquid water content (LWC), and pressure considerably influenced the ice mass. A lower temperature had a positive effect on ice accretion. The mass of ice accretion increased with the increase in LWC. Ice did not form easily under low pressure due to evaporation and sublimation. Finally, the effects of the ambient LWC and initial helium mass were analyzed. It was shown that an LWC of 0.5 g/m³ resulted in severe degradation of the ascent performance. When the initial helium mass was not sufficient, the airship landed due to ice accumulation. However, redundant inflation increased the ice mass and lowered the cruising altitude.

A novel coplanar waveguide-fed triple-band antenna with omni directional radiation patters in the azimuth plane is proposed. The proposed antenna consists of a rectangular patch monopole with a Π-shaped slot. It can provide three separate impedance bandwidths of 27%, range from 2.22 to 2.89GHz; bandwidth of 15%, range from 3.18 to 3.71GHz; and bandwidths of 22%, range from 5.09 to 6.33GHz, respectively, covering all the 2.4/5.2/5.8GHz WLAN bands and 2.5/3.5/5.5GHz WiMAX bands.