| 摘要 |
PCT No. PCT/US96/11758 Sec. 371 Date Mar. 14, 1997 Sec. 102(e) Date Mar. 14, 1997 PCT Filed Jul. 17, 1996 PCT Pub. No. WO97/04495 PCT Pub. Date Feb. 6, 1997A distributed microwave window (12) couples microwave power in the HE11 mode between a first large diameter waveguide (32) and a second large diameter waveguide (34), while providing a physical barrier between the two waveguides, without the need for any transitions to other shapes or diameters. The window comprises a stack of alternating dielectric (14) and hollow metallic (16) strips, brazed together to form a vacuum barrier. The vacuum barrier is either transverse to or tilted with respect to the waveguide axis. The strips are oriented to be perpendicular to the transverse electric field of the incident microwave power. The metallic strips are tapered on both sides of the vacuum barrier, which taper serves to funnel the incident microwave power through the dielectric strips (14). A suitable coolant flows through a coolant channel (18) that passes through the metallic strips (16). The microwave window further includes an impedance matching transition (15) between the tapered metal vanes and insulating dielectric material used to create the vacuum barrier of the window. Such impedance matching transition comprises one or more quarter wave ( lambda /4) matching sections in the individual vane structure that achieves the required impedance match. The effect of such impedance match is to render the dielectric material, e.g., sapphire, non resonant. Such non-resonance significantly widens the bandwidth of the window.
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