Metamaterial diplexers, combiners and dividers
View Patent ↗A wireless device having a CRLH structure incorporates a power combiner/divider and diplexer. In one embodiment, circuit parameters are selected to achieve impedance matching using a transmission line structure.
1. A wireless device, comprising:
a plurality of antenna elements having Composite Right/Left Hand (CRLH) structures;
a power combiner/divider circuit coupled to each of the plurality of antenna elements, the power combiner/divider circuit having a plurality of feed paths, each having a diode; and
a diplexer having a downstream end coupled to the power combiner/divider circuit, the diplexer having an upstream end operable to select between a plurality of paths for processing multiple frequency bands, a frequency band on one of the paths being different from a frequency band of a different path.
2. The wireless device of claim 1 , wherein the power combiner/divider circuit comprising a CRLH structured transmission line.
3. The wireless device of claim 2 , wherein the diplexer comprises a plurality of switches.
4. The wireless device of claim 3 , wherein at least one of the plurality of switches supports transmit and receive signals.
5. The wireless device of claim 3 , wherein a first switch of the plurality of switches is adapted to process signals in a first frequency band, and a second switch of the plurality of switches is adapted to process signals in a second frequency band.
6. The wireless device of claim 3 , wherein the plurality of switches are single pole double throw switches.
7. The wireless device of claim 1 , wherein the power combiner/divider comprises:
a branch point coupled to the diplexer; and
a plurality of feed paths coupled to the branch point, the plurality of feed paths coupled to the plurality of antenna elements.
8. The wireless device of claim 1 , wherein the diplexer comprises multiple diplexer paths, wherein a first diplexer path supports multiple transmit frequency bands and the second diplexer path supports multiple receive frequency bands.
9. The wireless device of claim 8 , further comprising a switching element coupled between the diplexer and the power combiner/divider, wherein the switch is used to select the first diplexer path for transmission of signals or to select the second diplexer path to receive signals.
10. A wireless device comprising:
an antenna element,
a power combiner/divider transmission line coupled to the antenna element; and
a plurality of diplexers coupled to the power combiner/divider transmission line;
wherein each of the plurality of diplexers includes:
a downstream end coupled to the power combiner/divider transmission line; and
an upstream end operable to select between a plurality of paths for processing multiple frequency bands, a frequency band on one of the paths being different from a frequency band of a different path.
11. The wireless device as in claim 10 , wherein the power combiner/divider transmission line is a zero degree component.
12. The wireless device as in claim 11 , wherein the power combiner/divider transmission line is a Composite Right Left Hand (CRLH) structure.
13. The wireless device as in claim 12 , wherein the device supports dual band operation.
14. The wireless device as in claim 13 , wherein each of the plurality of diplexers is coupled to the power combiner/divider transmission line at a port point having a first impedance value.
15. The wireless device as in claim 14 , wherein each of the plurality of diplexers has a diplexing point having a second impedance value.
16. The wireless device as in claim 12 , wherein the power combiner/divider comprises a plurality of unit cells, and wherein each unit cell has equivalent circuit parameters corresponding to an associated phase.
17. The wireless device as in claim 16 , wherein a capacitance element is coupled between each of the diplexers and the power combiner/divider transmission line.
18. The wireless device as in claim 17 , wherein a feed capacitance is coupled between the power combiner/divider transmission line and the antenna element.
19. The wireless device as in claim 16 , wherein the associated phase is selected from the values of ±2k×180° (k=0, 1, 2 . . . ).
20. The wireless device as in claim 19 , wherein the equivalent circuit parameters and corresponding associated phases provide impedance matching between the plurality of diplexers and the antenna element.