Rf waveguide windows

One side of the ceramic faces the vacuum of the linac. The other side faces the pressurized waveguide that leads to the RF power source magnetron, klystron, ….

This allows the linac to be connected to the RF power source without those two devices having to share vacuum space. RF power can travel through vacuum and gas while the linac and magnetron only function in high vacuum. RF windows make this arrangement possible and provide infinite packaging options for the linac and magnetron combo.

In a Radiotherapy Linac, these packaging options make the overall machine, and therefore the entire radiotherapy suite, smaller and considerably less expensive for the hospital. Additionally, separating the linac and magnetron makes servicing both of them significantly easier. RF Windows. Impedance Matched to Minimize Reflection. Copper, Stainless and Ceramic. Looking to get it right the first time? Come Work With Us. Our window designs are available with a variety of materials. MCi has a long-standing history of incorporating both air cooling and liquid cooling into our microwave components.

Generally, cooling style is a decision based upon average power levels. For custom assemblies, please contact our sales team at sales microwavetechniques.

The design library of components offered by the Microwave Techniques group is unparalleled to any other portfolio in the RF industry. Keep in mind that despite their simple appearance, modern coaxial cables are highly engineered, precisely manufactured assembles of center conductor, interposed dielectric, outer shield, and protective insulation demanding high levels of material and production consistency.

Cables for higher frequencies with lower loss and better stability are relatively new developments. The first magnetrons in WWII operated in the MHz range we now consider that a low frequency, but it was very new territory at the time , and used waveguides, as coaxial cables for that frequency did not exist.

A: Waveguides were independently developed in the early s by researchers at MIT and Bell Labs, as frequencies moved up into the tens and hundreds of MHz and power levels increased to hundreds of watts and even kW levels. Waveguide principles center on three attributes of the E-fields electric and H-fields magnetic of EM energy:. A: As a consequence of these rules, only certain modes of propagation exist.

Discussions about the different types of waveguide modes often indicate the specific transverse electric TE and transverse magnetic TM modes with integers after them: TE m,n. The numerals M and N can take on separate values from 0 or 1 to infinity. These indicate the wave modes within the waveguide. What is designated as dominant transverse electric mode 10 or TE 10 the mode with the lowest cutoff frequency is the basic mode of energy propagation in a rectangular waveguide. In that mode, the electric field lines do cross the transverse plane, and they are all vertical Figure 2.

In other words, the E-field lines are normal at right angles to the longer waveguide wall while the H-field lines are normal to the short wall. Q: I am familiar with transmission lines; how does a waveguide differ from a transmission line? A: Circular ones can be used but they are less common.

For circular waveguides, the dominant mode of energy propagation is the TE 11 mode.