Effects of Reentry Plasma Sheath on GPS Patch Antenna Polarization Property

Table 1

Collision frequencies in different typical altitudes (𝑇 = 2000 K).

Altitude/kft	70	82	100	156
Collision frequency/GHz	23.00	13.18	5.71	0.42
Altitude/kft	175	202	233	250
Collision frequency/MHz	175.0	49.92	11.82	5.37