Antennas for handheld electronic devices with conductive bezels
A handheld electronic device may be provided that contains wireless communications circuitry. The handheld electronic device may have a housing and a display. The display may be attached to the housing using a conductive bezel. The handheld electronic device may have one or more antennas for supporting wireless communications. A ground plane in the handheld electronic device may serve as ground for one or more of the antennas. The ground plane and bezel may define an opening. A rectangular slot antenna or other suitable slot antenna may be formed from or within the opening. One or more antenna resonating elements may be formed above the slot. An electrical switch that bridges the slot may be used to modify the perimeter of the slot so as to tune the communications bands of the handheld electronic device.
1. A handheld electronic device, comprising:
a housing having a peripheral conductive member; and
a hybrid antenna in the housing, wherein the hybrid antenna comprises:
a ground plane;
a slot formed in the ground plane, wherein the slot has at least one resonating frequency;
a resonating element above the slot and above the ground plane; and
a switchable component that bridges the slot and that adjusts the resonating frequency of the slot, wherein the slot has at least one edge formed from a portion of the peripheral conductive member.
2. The handheld electronic device defined in claim 1 wherein the switchable component comprises a diode.
3. The handheld electronic device defined in claim 1 wherein the switchable component comprises a p-i-n diode.
4. The handheld electronic device defined in claim 1 further comprising:
control circuitry that generates control signals and that provides the control signals to the switchable component to tune the slot.
5. The handheld electronic device defined in claim 1 , wherein the peripheral conductive member comprises a bezel, wherein the slot has at least a first edge formed from the ground plane and has at least a second edge formed from the bezel.
6. The handheld electronic device defined in claim 1 wherein the peripheral conductive member comprises a bezel, wherein the slot is formed by an opening between the bezel and the ground plane.
7. The handheld electronic device defined in claim 1 wherein the resonating element comprises an inverted-F resonating element.
8. A handheld electronic device, comprising:
a housing; and
a hybrid antenna in the housing, wherein the hybrid antenna comprises:
a ground plane;
a slot formed in the ground plane, wherein the ground plane completely surrounds and encloses the slot and wherein the slot has at least one resonating frequency;
a resonating element above the slot and above the ground plane; and
a switchable component that bridges the slot and that adjusts the resonating frequency of the slot.
9. A handheld electronic device, comprising:
a housing; and
a hybrid antenna in the housing, wherein the hybrid antenna comprises:
a ground plane;
a slot formed in the ground plane, wherein the slot has opposing first and second ends and at least one resonating frequency;
a resonating element above the slot and above the ground plane; and
a switchable component that bridges the slot and that adjusts the resonating frequency of the slot, wherein the switchable component bridges the slot at an intermediate location along the slot between the first and second ends of the slot.
10. The handheld electronic device defined in claim 9 , wherein the switchable component comprises a switch, the slot has a first perimeter when the switch is open, the slot has a second perimeter when the switch is closed, and the second perimeter is less than the first perimeter.
11. The handheld electronic device defined in claim 9 further comprising:
a bezel, wherein the slot has at least a first edge formed from the ground plane and has at least a second edge formed from the bezel.