Multiple band antenna structures
Various antenna designs are presented that can be used to provide for wireless communication in electronic devices, such as wearable electronic devices. Various embodiments provide antenna structures and designs that can support multiple frequency bands in a relatively compact space. Various embodiments utilize a ring antenna forming a portion of an outer perimeter of the housing, the ring antenna including a plurality of connections coupled the PCB, the plurality of connections. The plurality of connections include at least one feed connection coupled to at least one signal source on the PCB, respectively, and at least one ground connection coupled to a ground point on the PCB. In some embodiments, the connections may be inductively or capacitively loaded. The ring antenna may include a single feed connection or multiple feed connections respectively coupled to different signal sources.
1. An electronic device, comprising:
a housing;
a display module positioned within the housing;
a printed circuit board (PCB) positioned within the housing, the PCB having one or more signal sources mounted thereon;
a split ring antenna forming a portion of an outer perimeter of the housing, wherein the split ring antenna is evenly and symmetrically split, and wherein the split ring antenna comprises a plurality of connections electrically coupled the PCB, the plurality of connections comprising:
a first feed connection coupled to a first signal source on the PCB;
a second feed connection coupled to a second signal source on the PCB; and
a ground connection coupled to a ground point on the PCB.
2. The electronic device of claim 1 , wherein the ground connection is coupled through a capacitor to the PCB, and wherein the first feed connection, the second feed connection, and the ground connection are DC isolated to the PCB.
3. The electronic device of claim 1 , wherein the ground connection is coupled through a matching circuit to the PCB.
4. The electronic device of claim 1 , wherein the first feed connection is coupled to a GPS signal source on the PCB.
5. The electronic device of claim 4 , wherein the distance between the first feed connection and the ground connection is approximately a half-wavelength at GPS frequencies.
6. The electronic device of claim 1 , wherein the second feed connection is coupled to a WiFi signal source on the PCB.
7. The electronic device of claim 1 , wherein the first feed connection is coupled to a GPS signal source on the PCB, and the second feed connection is coupled to a WiFi signal source on the PCB.
8. The electronic device of claim 1 , wherein the split ring antenna is positioned between two portions of the housing.
9. An electronic device, comprising:
a housing;
a display module positioned at an opening of the housing;
a printed circuit board (PCB) positioned within the housing, the PCB having one or more signal sources mounted thereon;
a split ring antenna forming at least a portion of an outer perimeter of the housing, wherein the split ring antenna is evenly and symmetrically split, and comprises a first portion and a second portion separated by portions of the housing, the split ring antenna comprising a plurality of connections coupled the PCB, the plurality of connections comprising:
a first feed connection coupled to a first signal source on the PCB;
a second feed connection coupled to a second signal source on the PCB; and
a ground connection coupled to a ground point on the PCB.
10. The electronic device of claim 9 , wherein the first portion of the split ring antenna comprises a first feed connection coupled to a GPS signal source on the PCB and a first ground connection.
11. The electronic device of claim 9 , wherein the second portion of the split ring antenna comprises the second feed connection coupled to a WiFi signal source on the PCB.
12. The electronic device of claim 9 , wherein the second portion of the split ring antenna comprises the second feed connection coupled to a WiFi signal source on the PCB and a second ground connection.
13. The electronic device of claim 9 , where the plurality of connections includes four connections, and wherein two feed connections and two other connections are respectively positioned in different quadrants of the split ring antenna.
14. The electronic device of claim 9 , wherein the split ring antenna is positioned between two portions of the housing.
15. The electronic device of claim 9 , wherein the ground connection is coupled to the PCB through a matching circuit.
16. The electronic device of claim 9 , wherein the ground connection is coupled through a capacitor to the PCB and all connections are DC isolated to the PCB.
17. A wearable computing device, comprising:
a device housing;
an attachment mechanism connected to the device housing and enabling the wearable computing device to be worn by a user;
an electronics module a processor and one or more signal sources;
a power source;
a display for displaying content under instruction of the processor;
a split ring antenna forming a portion of an outer perimeter of the housing, wherein the split ring antenna is evenly and symmetrically split, and comprises a plurality of connections coupled the PCB, the plurality of connections comprising:
a first feed connection coupled to a first signal source on the PCB;
a second feed connection coupled to a second signal source on the PCB; and
at least one ground connection coupled to a ground point on the PCB.
18. The wearable computing device of claim 17 , wherein the plurality of connections includes four total connections positioned respectively in different quadrants of the split ring antenna.
19. The wearable computing device of claim 17 , wherein the ground connection is coupled through a capacitor to the PCB and all connections are DC isolated to the PCB.
20. The wearable computing device of claim 17 , wherein the first feed connection is coupled to a GPS signal source on the PCB, and the second feed connection is coupled to a WiFi signal source on the PCB.
21. The wearable computing device of claim 17 , wherein the split ring antenna comprises a first portion and a second portion separated by gaps or portions of the housing.
22. The wearable computing device of claim 21 , wherein the ground connection is coupled through a capacitor to the PCB and the first feed connection, second feed connection, and ground connection are DC isolated to the PCB.