Antenna stack
An antenna stack includes a glass cover having an outer face, an inside face opposite the outer face, and a body therebetween. The glass cover additionally has a cavity formed therein, extending into the body from the inside face. The antenna stack further includes an antenna patch positioned within the cavity, and a waveguide layer. The waveguide layer includes polycrystalline ceramic underlying the glass cover. Conductive vias extend through the polycrystalline ceramic and partition the waveguide layer to form feed channels through the polycrystalline ceramic, and major surfaces of the polycrystalline ceramic are overlaid with a conductor having openings that open to the feed channels. The antenna patch is spaced apart from the waveguide layer to facilitate evanescent wave coupling between the feed channels and the antenna patch.
1. An antenna stack, comprising,
a glass cover having an outer face, an inside face opposite the outer face, and a body therebetween, the glass cover additionally having a cavity formed therein extending into the body from the inside face;
an antenna patch positioned within the cavity; and
a waveguide layer comprising polycrystalline ceramic underlying the glass cover, wherein conductive vias extend through the polycrystalline ceramic and partition the waveguide layer to form feed channels through the polycrystalline ceramic, and wherein major surfaces of the polycrystalline ceramic are overlaid with a conductor having openings in the conductor that open to the feed channels extending through the polycrystalline ceramic;
wherein the antenna patch is physically spaced apart from the waveguide layer a distance to facilitate evanescent wave coupling between the feed channels and the antenna patch.
2. The antenna stack of claim 1 , wherein combined thickness of the glass cover and waveguide layer is less than 0.6 millimeters.
3. The antenna stack of claim 1 , wherein the conductor comprises indium tin oxide and the laminate antenna stack is at least partially translucent in the visible spectrum.
4. The antenna stack of claim 1 , further comprising circuitry underlying the waveguide layer and positioned adjacent the major surface of the waveguide layer opposite the glass cover, wherein the circuitry is coupled to the feed channels.
5. The antenna stack of claim 4 , further comprising a glass backplate welded directly to the glass cover, wherein the waveguide layer and circuitry are hermetically sealed between the glass cover and the glass backplate.
6. The antenna stack of claim 1 , wherein the antenna patch is one of a plurality of antenna patches positioned within the body of the glass cover, the plurality of antenna patches forming an active antenna array, wherein depths of antenna patches of the plurality vary with respect to one another relative to the inside face of the glass cover.
7. The antenna stack of claim 1 , wherein the antenna patch is one of a plurality of antenna patches positioned within the body of the glass cover, the plurality of antenna patches forming an active antenna array, wherein orientation angles of antenna patches of the plurality vary with respect to one another.