Waveguide-to-microstrip transition with through holes formed through a waveguide channel area in a dielectric board
The invention relates to microwave technology and can be used in measuring technology and wireless communication. The technical result is a waveguide-to-microstrip transition which provides reduced signal transmission losses and increased working bandwidth together with a low wave reflection coefficient. A contacting metal layer is arranged on an upper surface of a dielectric circuit board around a micro-strip probe, without electrical contact with the micro-strip probe and a micro-strip transmission line and forming an internal area on the dielectric circuit boar being a waveguide channel area. A closed waveguide section having a slot in the area of the microstrip transmission line is arranged on the contacting metal layer. At least one metallized transition through-hole is formed along a perimeter around the area of the waveguide channel in the metal layers and in the dielectric circuit board, and at least one non-metallized through-hole is formed inside the waveguide channel area.
1. A waveguide-to-microstrip transition comprising: an input waveguide piece having a through-hole defining an open waveguide channel, a short-circuited waveguide piece having a blind cavity defining a closed waveguide channel, and a dielectric board placed between the input and short-circuited waveguide pieces; wherein a microstrip transmission line, a microstrip probe formed as an extension of the microstrip transmission line, and a contact metal layer are located on a top surface of the dielectric board, wherein the contact metal layer surrounds the microstrip probe with no electrical connection to the microstrip probe and the microstrip transmission line and forms an internal area on the dielectric board, the internal area being a waveguide channel area; wherein the short-circuited waveguide piece is located on the contact metal layer and has a recess in the area of the microstrip transmission line, wherein a ground metal plane surrounding the waveguide channel area is located on a bottom surface of the dielectric board, the input waveguide piece being mounted on the ground metal plane, wherein at least one metallized transition through-hole is provided along the circumference around the waveguide channel area in the contact metal layer, ground metal plane and in the dielectric board, and wherein at least two non-metallized through-holes are provided within the waveguide channel area on the dielectric board.
2. The transition according to claim 1 , wherein an integrated circuit is mounted on the dielectric board, the integrated circuit is configured to electrically connect to the microstrip transmission line by means of surface-mount technology.
3. The transition according to claim 2 , wherein the dielectric board has a special cavity therein provided for receiving the integrated circuit to be mounted therein, the integrated circuit being configured to have electrical contact with the microstrip transmission line.
4. The transition according to claim 1 , wherein the dielectric board includes at least two dielectric layers with the ground metal plane disposed in-between the at least two dielectric layers, the ground metal plane being a ground lead of the microstrip transmission line.
5. The transition according to claim 1 , wherein the microstrip probe has a circular, sectoral, rectangular or trapezoidal longitudinal section.
6. The transition according to claim 1 , wherein the waveguide channel has a rectangular, circular or elliptical cross-section.
7. The transition according to claim 1 , wherein the closed waveguide channel has a rectangular, circular or trapezoidal longitudinal cross-section.
8. The transition according to claim 1 , wherein at the least one non-metallized through-hole is symmetrically located at each side of the microstrip probe within the waveguide channel area on the dielectric board.
9. The transition according to claim 1 , wherein the dielectric board, the ground metal plane and the contact metal layer have metallized mounting through-holes to provide connection between the board and the input and short-circuited waveguide pieces.
10. The transition according to claim 1 , wherein the input waveguide piece is electrically connectable with a horn antenna.
11. The transition according to claim 1 , wherein the input waveguide piece is electrically connectable with a diplexer.
12. The transition according to claim 1 , wherein the dielectric board is fabricated using technology selected from a group comprising: printed circuit board technology; low temperature co-fired ceramic technology; laser transfer printing technology; thin-film technology; liquid crystal polymer technology.
13. The transition according to claim 1 , wherein the input and short-circuited waveguide pieces are each made of a dielectric material covered with metal.
14. The transition according to claim 1 , wherein the input and short-circuited waveguide pieces are each made of metal.
15. The transition according to claim 1 , wherein the open and closed waveguide channels are partially or fully filled with a dielectric material.