Cavity backed slot antenna with in-cavity resonators
AssigneeVayyar Imaging Ltd.
InventorsNaftali Chayat, Doron Cohen
Life of this patent
Estimating the term…
Abstract
A compact wideband RF antenna for incorporating into a planar substrate, such as a PCB, having at least one cavity with a radiating slot, and at least one transmission line resonator disposed within a cavity and coupled thereto. Additional embodiments provide stacked slot-coupled cavities and multiple coupled transmission-line resonators placed within a cavity. Applications to ultra-wideband systems and to millimeter-wave systems, as well as to dual and circular polarization antennas are disclosed.
Claims16
A radio-frequency (RF) waveguide launcher for a planar substrate, the waveguide launcher comprising:
- a dielectric material within the planar substrate;
- a plurality of electrically-conductive layers within the planar substrate;
- a cavity within the planar substrate, the cavity containing a portion of the dielectric material and bounded by portions of the electrically-conductive layers and by vertical sidewalls formed of electrically-interconnected portions of the electrically-conductive layers;
- a waveguide launcher feed, for electromagnetically coupling the waveguide launcher to RF circuitry;
- a radiating slot in the cavity, for electromagnetically coupling the cavity to an RF field within a waveguide;
- and
- at least two transmission line resonators disposed within the cavity such that the at least two transmission line resonators are respectively situated in different electrically-conductive layers;
- wherein:
- at least one of the transmission line resonators is electromagnetically coupled to the waveguide launcher feed;
- at least one of the transmission line resonators is electromagnetically coupled to the cavity;
- and
- at least two of the transmission line resonators are electromagnetically-coupled to each other.
A radio-frequency (RF) waveguide launcher for a planar substrate, the waveguide launcher comprising:
- a dielectric material within the planar substrate;
- a plurality of electrically-conductive layers within the planar substrate;
- at least two cavities within the planar substrate, each cavity containing a portion of the dielectric material and bounded horizontally at the top and at the bottom by respective portions of two different electrically-conductive layers, and bounded vertically at all sides by vertical sidewalls formed of electrically-interconnected portions of the electrically-conductive layers;
- a waveguide launcher feed, for electromagnetically coupling the waveguide launcher to RF circuitry;
- a radiating slot in one of the at least two cavities, for electromagnetically coupling the one cavity to an RF field within a waveguide;
- and
- at least one transmission line resonator disposed within at least one of the cavities;
- wherein:
- the cavities are vertically stacked within the planar substrate;
- each cavity is vertically adjacent to another cavity of the at least two cavities;
- each cavity shares a common electrically-conductive layer with an adjacent cavity;
- each common electrically-conductive layer has disposed therein a slot which electromagnetically couples a cavity to the adjacent cavity thereof;
- at least one of the transmission line resonators is electromagnetically coupled to the waveguide launcher feed;
- and
- at least one of the transmission line resonators is electromagnetically coupled to one of the cavities.
Dependencies are inferred from the claim text.