Electronic devices with probe-fed dielectric resonator antennas
An electronic device may be provided with a phased antenna array and a display cover layer. The phased antenna array may include a probe-fed dielectric resonator antenna. The antenna may include a dielectric resonating element mounted to a flexible printed circuit. A feed probe may be formed from a patch of conductive traces on a sidewall of the resonating element. The feed probe may excite resonant modes of the resonating element. The resonating element may convey corresponding radio-frequency signals through the display cover layer. An additional feed probe may be mounted to an orthogonal sidewall of the resonating element for covering additional polarizations. Probe-fed dielectric resonator antennas for covering different polarizations and frequencies may be interleaved across the phased antenna array.
1. An electronic device comprising:
a printed circuit;
a dielectric column mounted to the printed circuit;
a dielectric cover layer overlapping the dielectric column;
a conductive patch on the dielectric column; and
a radio-frequency transmission line coupled to the conductive patch, wherein the conductive patch is configured to excite the dielectric column to radiate radio-frequency signals at a frequency between 10 GHz and 300 GHz through the dielectric cover layer.
2. The electronic device defined in claim 1 , wherein the conductive patch is configured to excite the dielectric column to radiate the radio-frequency signals with a first linear polarization, the electronic device further comprising:
an additional conductive patch on the dielectric column; and
an additional radio-frequency transmission line coupled to the additional conductive patch, wherein the additional conductive patch is configured to excite the dielectric column to radiate additional radio-frequency signals at the frequency and with a second linear polarization orthogonal to the first linear polarization.
3. The electronic device defined in claim 2 , further comprising:
ground traces on the printed circuit, wherein the ground traces define a slot that is aligned with the dielectric column, the slot being configured to match an impedance of the radio-frequency transmission line to an impedance of the dielectric column.
4. The electronic device defined in claim 2 , wherein the radio-frequency transmission line comprises a signal trace and the conductive patch comprises a trace that is patterned on the dielectric column and coupled to the signal trace.
5. The electronic device defined in claim 4 , wherein the trace is configured to match an impedance of the radio-frequency transmission line to an impedance of the dielectric column.
6. The electronic device defined in claim 4 , wherein the signal trace comprises a matching stub configured to match an impedance of the radio-frequency transmission line to an impedance of the dielectric column.
7. The electronic device defined in claim 4 , wherein the conductive patch is coupled to the signal trace with solder.
8. The electronic device defined in claim 1 , further comprising:
a dielectric substrate mounted to the printed circuit and laterally surrounding the dielectric column, wherein the dielectric column has a first dielectric constant and the dielectric substrate has a second dielectric constant that is at least 10.0 less than the first dielectric constant.
9. The electronic device defined in claim 1 , further comprising:
a housing with a rear housing wall and peripheral conductive housing structures that extend from the rear housing wall to the dielectric cover layer; and
a display module that emits light through the dielectric cover layer, wherein the printed circuit runs along the rear housing wall, and the dielectric column is configured to convey the radio-frequency signals through a portion of the dielectric cover layer that is between the display module and the peripheral conductive housing structures.
10. The electronic device defined in claim 9 , wherein the display module comprises a notch, the notch having edges defined by the display module and the peripheral conductive housing structures, the electronic device further comprising:
an image sensor aligned with the notch, wherein the dielectric column is aligned with the notch and is configured to convey the radio-frequency signals through the notch.
11. An electronic device comprising:
a printed circuit;
a dielectric column mounted to the printed circuit;
a dielectric substrate mounted to the printed circuit and laterally surrounding the dielectric column;
a dielectric cover layer overlapping the dielectric column; and
a radio-frequency transmission line on the printed circuit and configured to convey radio-frequency signals at a frequency between 10 GHz and 300 GHz, wherein the radio-frequency transmission line is configured to excite an electromagnetic resonant mode of the dielectric column, the dielectric column being configured to form a waveguide for the radio-frequency signals that directs the radio-frequency signals through the dielectric cover layer.
12. The electronic device defined in claim 11 , further comprising:
an additional dielectric column laterally surrounded by the dielectric substrate, wherein the additional dielectric column is configured to form an additional waveguide for additional radio-frequency signals that directs the additional radio-frequency signals through the dielectric cover layer.
13. The electronic device defined in claim 12 , wherein the dielectric column and the additional dielectric column form a portion of a phased antenna array.
14. The electronic device defined in claim 11 , further comprising:
a first conductive patch configured to excite the dielectric column to radiate the radio-frequency signals with a first linear polarization; and
a second conductive patch configured to excite the dielectric column to radiate the radio-frequency signals with a second linear polarization.
15. The electronic device defined in claim 14 , wherein the dielectric column has a lower surface coupled to the printed circuit, a first side surface coupled to the first conductive patch, and a second side surface that is adjacent to the first side surface and coupled to the second conductive patch.
16. The electronic device defined in claim 11 , wherein the radio-frequency transmission line comprises a matching stub configured to match an impedance of the radio-frequency transmission line to an impedance of the dielectric column.
17. An electronic device comprising: a housing; a display in the housing; a dielectric a dielectric cover layer overlapping the display; and a millimeter wave antenna configured to convey radio-frequency signals at a given frequency through the dielectric cover layer, wherein the millimeter wave antenna has a dielectric resonating element and first and second feed probes on the dielectric resonating element, the first feed probe being configured to excite the dielectric resonating element to radiate the radio-frequency signals with a first linear polarization, and the second feed probe being configured to excite the dielectric resonating element to radiate the radio-frequency signals with a second linear polarization orthogonal to the first linear polarization.
18. The electronic device defined in claim 17 , wherein the millimeter wave antenna is in a first set of antennas configured to convey first radio-frequency signals at the given frequency, the electronic device further comprising:
a second set of antennas configured to convey second radio-frequency signals at a second frequency through the dielectric cover layer, wherein the antennas in the second set are interleaved among the antennas in the first set.
19. The electronic device defined in claim 18 , wherein each antenna in the second set has an additional dielectric resonating element and third and fourth feed probes on the additional dielectric resonating element, the third feed probe being configured to excite the additional dielectric resonating element to radiate the second radio-frequency signals with the first linear polarization, and the fourth feed probe being configured to excite the additional dielectric resonating element to radiate the radio-frequency signals with the second linear polarization.
20. The electronic device defined in claim 18 , wherein the given frequency comprises a frequency between 24 GHz and 31 GHz and the second frequency comprises a frequency between 37 GHz and 41 GHz.