| 摘要 |
PCT No. PCT/EP89/01483 Sec. 371 Date May 23, 1991 Sec. 102(e) Date May 23, 1991 PCT Filed Dec. 5, 1989 PCT Pub. No. WO90/06665 PCT Pub. Date Jun. 14, 1990.An antenna system for producing a millimeter wave beam having a Gaussian distribution uses a high power source and a partial mode converter operatively coupled to the source and reviving from the source a Tm,n mode wave which might either be TEm,n or TMm,n'. The converter delivers a mixture of modes including the mode Tm,n at a relative power rate of 70 to 85% and at a relative phase 0, and at least one of the following additional modes, namely Tm,n-1 at a relative power rate of 10 to 20% and at relative phase (pi), and TEm,n+1 at a relative power rate of 10 to 20% and at relative phase (pi). The mixture of modes is applied to a collimation reflector (3, 10), having a concentration point (5) constituting the antenna system outlet. The antenna system can convert any Tm,n mode into a linearly polarized narrow beam of very high power (about 1 MW) and and of high frequencies above 100 GHz.
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