Microwave antenna probe
View Patent ↗Example microwave antenna probes, radio frequency arrangements, and methods for controlling an antenna patch connected to a microwave transmission line are disclosed. The antenna patch and the microwave transmission line are attached on a printed circuit board. An example microwave antenna probe includes a metal body, a waveguide, and a cavity. The metal body includes a bottom face and a top face opposing the bottom face. The waveguide is formed in the metal body. The cavity is formed at the bottom face of the metal body and is coupled with the waveguide and configured to enable microwave transition between the microwave transmission line and the waveguide. The microwave antenna probe is configured to disable the antenna patch and to redirect an antenna feeding signal from the microwave transmission line via the cavity to the waveguide when the antenna patch is contacted by the bottom face of the metal body.
1 . A microwave antenna probe for controlling an antenna patch connected to a microwave transmission line, the antenna patch and the microwave transmission line being attached on a printed circuit board, the microwave antenna probe comprising:
a metal body comprising a bottom face and a top face, the top face opposing the bottom face;
a waveguide formed in the metal body; and
a cavity formed at the bottom face of the metal body, the cavity being coupled with the waveguide and configured to enable microwave transition between the microwave transmission line and the waveguide;
wherein the microwave antenna probe is configured to disable the antenna patch and to redirect an antenna feeding signal from the microwave transmission line via the cavity to the waveguide when the antenna patch is contacted by the bottom face of the metal body.
2 . The microwave antenna probe of claim 1 , wherein the cavity at the bottom face of the metal body is configured for placement above the microwave transmission line to enable the microwave transition via the cavity.
3 . The microwave antenna probe of claim 1 , the microwave antenna probe comprising a shim formed in the metal body, the shim separating the cavity from the waveguide, wherein the shim comprises at least one slot opening configured to enable the microwave transition between the cavity and the waveguide.
4 . The microwave antenna probe of claim 3 , wherein the at least one slot opening has a bowtie shape, a C-shape, a H-shape, a rectangular shape or any other geometrical shape.
5 . The microwave antenna probe of claim 1 , comprising:
a plurality of holes formed at the bottom face of the metal body, the plurality of holes being configured to suppress microwave signal leakage when the antenna patch is contacted by the bottom face of the metal body.
6 . The microwave antenna probe of claim 5 , wherein the plurality of holes are periodically distributed across the bottom face of the metal body.
7 . The microwave antenna probe of claim 1 , wherein the bottom face of the metal body forms a ground plane configured to short the antenna patch to ground when the antenna patch is contacted by the bottom face.
8 . The microwave antenna probe of claim 1 , comprising a clearance formed at the bottom face of the metal body between the cavity and a lateral side of the bottom face, wherein the clearance is configured for placement above the microwave transmission line and configured to avoid a short of the microwave transmission line when the antenna patch is contacted by the bottom face of the metal body.
9 . The microwave antenna probe of claim 1 , comprising mechanical attachment means configured to mechanically attach the bottom face of the metal body to the antenna patch by providing a detachable mechanical connection.
10 . The microwave antenna probe of claim 1 , wherein the waveguide comprises a WR-12 air-filled waveguide extending from the cavity at the bottom face of the metal body to the top face of the metal body.
11 . The microwave antenna probe of claim 1 , wherein the waveguide comprises a first section formed as an air-filled waveguide and a second section formed as a dielectric waveguide, wherein the waveguide is tapered at a transition from the air-filled waveguide to the dielectric waveguide.
12 . The microwave antenna probe of claim 1 , wherein a depth of the cavity is a quarter wavelength of the antenna feeding signal.
13 . The microwave antenna probe of claim 1 , wherein the metal body comprises a full metal body or a plastic core.
14 . The microwave antenna probe of claim 1 , wherein the antenna feeding signal comprises a microwave signal.
15 . A radio frequency arrangement, comprising:
a microwave antenna probe for controlling an antenna patch connected to a microwave transmission line, the microwave antenna probe comprising:
a metal body comprising a bottom face and a top face, the top face opposing the bottom face;
a waveguide formed in the metal body; and
a cavity formed at the bottom face of the metal body, the cavity being coupled with the waveguide and configured to enable microwave transition between the microwave transmission line and the waveguide;
wherein the microwave antenna probe is configured to disable the antenna patch and to redirect an antenna feeding signal from the microwave transmission line via the cavity to the waveguide when the antenna patch is contacted by the bottom face of the metal body; and
a printed circuit board comprising:
the antenna patch attached on the printed circuit board; and
the microwave transmission line connecting the antenna patch to an integrated circuit, wherein the microwave transmission line and the integrated circuit are attached on the printed circuit board,
wherein the microwave antenna probe is contacting the antenna patch by the bottom face of the metal body.
16 . The radio frequency arrangement of claim 15 , wherein the cavity at the bottom face of the metal body is configured for placement above the microwave transmission line to enable the microwave transition via the cavity.
17 . The radio frequency arrangement of claim 15 , wherein the microwave antenna probe comprises a shim formed in the metal body, the shim separating the cavity from the waveguide, wherein the shim comprises at least one slot opening configured to enable the microwave transition between the cavity and the waveguide.
18 . The radio frequency arrangement of claim 17 , wherein the at least one slot opening has a bowtie shape, a C-shape, a H-shape, a rectangular shape or any other geometrical shape.
19 . The radio frequency arrangement of claim 15 , wherein the microwave antenna probe comprises a plurality of holes formed at the bottom face of the metal body, the plurality of holes being configured to suppress microwave signal leakage when the antenna patch is contacted by the bottom face of the metal body.
20 . A method for controlling an antenna patch attached on a printed circuit board, the method comprising:
providing a microwave antenna probe, the microwave antenna probe comprising:
a metal body comprising a bottom face and a top face, the top face opposing the bottom face;
a waveguide formed in the metal body; and
a cavity formed at the bottom face of the metal body, the cavity being coupled with the waveguide and configured to enable microwave transition between a microwave transmission line attached on the printed circuit board and the waveguide;
contacting the antenna patch by the bottom face of the metal body;
disabling the antenna patch by the contact with the bottom face of the metal body; and
redirecting an antenna feeding signal from the microwave transmission line via the cavity to the waveguide by the contact with the bottom face of the metal body.