CHOKE FOR AN OVEN
A choke is disclosed. The choke is configured to attenuate propagation of an electromagnetic (EM) wave between a cavity and a door adjacent to an opening of the cavity. The choke includes one or more choke components having a mechanical wave attenuating structure.
1 - 24 . (canceled)
25 . A choke configured to attenuate propagation of an electromagnetic (EM) wave between a cavity and a door adjacent to an opening of the cavity, comprising:
one or more choke components having a wave attenuating structure, wherein the wave attenuating structure comprises at least one reactive element attached to an inner surface of the one or more choke components and situated perpendicular to a propagation direction of the electromagnetic wave.
26 . The choke of claim 25 , wherein the at least one reactive element includes teeth.
27 . The choke of claim 25 , wherein at least one of the one or more choke components includes a folded waveguide.
28 . The choke of claim 25 , wherein the choke is configured to attenuate propagation of the electromagnetic (EM) wave within a band of frequencies.
29 . The choke of claim 28 , wherein at least one of the one or more choke components has a dimension equal to or less than λ/4, wherein λ is a wavelength associated with a central frequency in the band of frequencies.
30 . The choke of claim 28 , wherein the band of frequencies has a central frequency between 800-1000 MHz.
31 . The choke of claim 28 , wherein the band of frequencies has a bandwidth of at least 200 MHz.
32 . The choke of claim 25 , wherein at least one of the one or more choke components has a dimension of less than λ/4, wherein λ is a wavelength of the electromagnetic wave.
33 . The choke of claim 25 , wherein the one or more choke components comprise a first choke component and a second choke component, wherein the first choke component has a first wave attenuating structure comprising at least one reactive element attached to an inner surface of the first choke component.
34 . The choke of claim 33 , wherein the second choke component has a second wave attenuating structure comprising at least one reactive element attached to an inner surface of the second choke component.
35 . The choke of claim 25 , wherein at least one of the one or more choke components comprises a dielectric material.
36 . The choke of claim 25 , wherein the choke further comprises a dielectric cover.
37 . The choke of claim 25 , wherein the choke is configured to attenuate propagation of the electromagnetic (EM) wave for at least one frequency at which a calculated S 21 parameter is −45 dB or less.
38 . The choke of claim 25 , wherein the choke is configured to attenuate propagation of the electromagnetic (EM) wave for at least one frequency at which a calculated normalized Z in parameter is 1 or less.
39 . A multi-level choke system comprising at least two chokes each according to claim 25 .
40 . The multi-level choke system of claim 39 , wherein each of the at least two chokes is configured to attenuate a propagation of a different band of frequencies having different central frequencies.
41 . The multi-level choke system of claim 39 , wherein the at least two chokes are configured to attenuate a propagation of frequency bands having substantially the same central frequency.
42 . A door for a radiofrequency (RF) oven, the door comprising one or more chokes each according to claim 25 .
43 . The door of claim 42 , the door having a maximal width of λ/5, wherein λ is a wavelength of a central frequency of an attenuated band of frequencies.
44 . An RF oven that includes a door comprising a choke according to claim 25 .