Standard rectangular waveguide with RF port input transition
Disclosed herein is a waveguide with an RF port input transition. The waveguide includes: a tubular rectangular body having openings formed at opposite sides thereof, each of the openings having a flange therearound; multiple isolator ports formed at predetermined intervals in one wall of the rectangular body, the isolator ports each being switchable between open and closed states; multiple impedance matching ports formed at predetermined intervals in another wall of the rectangular body opposite the one wall, the impedance matching ports each being switchable between open and closed states; and a radiator port formed at a center of the one wall of the rectangular body.
1 . A waveguide configured to transition between a normal use mode and a measurement mode, the waveguide comprising:
a tubular rectangular body having openings formed at opposite sides thereof, each of the openings having a flange therearound;
multiple isolator ports formed at first predetermined intervals in a first wall of the rectangular body, wherein each isolator port is switchable between open and closed states to allow an RF isolator to be selectively coupled thereto, wherein an isolator port cover is coupled to a corresponding isolator port of the isolator ports when the corresponding isolator port is at the closed state, and wherein the isolator port cover is removed when the corresponding isolator port is at the open state;
multiple impedance matching ports formed at second predetermined intervals in a second wall of the rectangular body opposite the first wall, wherein each impedance matching port is switchable between open and closed states to allow an RF impedance matcher to be selectively coupled thereto, wherein an impedance matching port cover is coupled to a corresponding impedance matching port of the impedance matching ports when the corresponding impedance matching port is at the closed state, and wherein the impedance matching port cover is removed when the corresponding impedance matching port is at the open state; and
a radiator port formed at a center of the first wall of the rectangular body, wherein the radiator port is switchable between open and closed states to allow an RF radiator to be selectively coupled thereto, wherein the radiator port is fitted to the RF radiator when the radiator port is at the open state, and wherein the radiator port is blocked by a stopper when the radiator port is at the closed state,
wherein the waveguide is operable in the measurement mode for measuring RF characteristics of the rectangular body transmitting RF waves therein.
2 . The waveguide of claim 1 , further comprising:
in the measurement mode, the RF isolator coupled to one of the multiple isolator ports;
the RF impedance matcher coupled to one of the multiple impedance matching ports; and
the RF radiator coupled to the radiator port,
wherein the RF isolator and the RF impedance matcher are disposed opposite each other with respect to the RF radiator.
3 . The waveguide of claim 2 , wherein the RF radiator is provided in a form of a bar, wherein a height of the bar is related to a radiation frequency wave of the RF radiator by a relationship is represented as:
height
of
the
bar
=
1
4
λ
+
1
2
λ
×
n
,
wherein λ is a wavelength of the radiation frequency wave, and wherein n is an integer greater than or equal to 0.
4 . The waveguide of claim 2 , wherein the RF radiator has at least one shape selected from the group consisting of cylindrical, triangular, conical, and bow-tie shapes.
5 . The waveguide of claim 2 , wherein a distance between the RF radiator and the RF isolator is determined based on a radiation frequency wave, wherein the distance is determined by
distance
=
1
4
λ
+
1
2
λ
×
n
,
wherein λ is a wavelength of the radiation frequency wave, and wherein n is an integer greater than or equal to 0.
6 . The waveguide of claim 2 , wherein:
the first and second walls of the rectangular body are partially formed as a first assembly plate and a second assembly plate detachably connected to the rectangular body, respectively;
the first assembly plate is connected to the rectangular body with the RF isolator and the RF radiator coupled to the first assembly plate; and
the second assembly plate is connected to the rectangular body with the RF impedance matcher coupled to the second assembly plate.
7 . The waveguide of claim 1 , further comprising:
one or more measurement adapters each coupled to a corresponding one of the respective flanges of the two openings of the rectangular body and allowing a coaxial cable of a measuring instrument to be connected thereto.
8 . An RF heating apparatus comprising the waveguide configured to transition between a normal use mode and a measurement mode according to claim 1 .