Multi-functional CRLH antenna device
This application relates to a multi-functional Composite Right and Left Handed CRLH antenna device. A conductive element of a wireless device is incorporated into the antenna structure for reuse. In one embodiment a peripheral feature, such as a key dome, is incorporated into the antenna device. In this way, the antenna structure includes portions which are multi-functional.
1. A metamaterial antenna device comprising:
a substrate structure;
one or more metallization layers supported by the substrate structure and structured to include:
a cell patch comprising a first switch contact;
a second switch contact configured to be bridged to the first switch contact when a switch is actuated;
a first ground electrode formed in one of the one or more metallization layers and conductively coupled to the cell patch through a conductive path; and
a feed structure coupled to the cell patch;
wherein the cell patch, the feed structure, and at least part of the substrate structure are configured to form a Composite Right/Left Handed (CRLH) antenna device structured to provide multiple resonant operating frequencies; and
wherein one or more of the first switch contact or the second switch contact is coupled to the first ground electrode using a frequency-selective coupling configured to suppress a shift in the multiple resonant operating frequencies between a state when the first and second switch contacts are isolated from each other as compared to a state where the first and second switch contacts are bridged.
2. The metamaterial antenna device as in claim 1 , wherein the cell patch is capacitively coupled to the feed structure.
3. The metamaterial antenna device as in claim 2 , wherein the capacitive coupling between the feed structure and the cell patch forms a Left Hand (LH) capacitance.
4. The metamaterial antenna device as in claim 3 , wherein the conductive path is structured to provide an inductive load to the cell patch, wherein the inductive load forms a Right Hand (RH) inductance.
5. The metamaterial antenna device as in claim 4 , wherein the RH inductance is structured to induce a RH resonant frequency, and the LH capacitance is structured to induce a LH resonant frequency lower than the RH resonant frequency.
6. The device as in claim 5 , wherein a RH capacitance is formed between the cell patch and the first ground electrode, wherein the cell patch is positioned so as to reduce the RH capacitance.
7. A method, comprising:
providing a substrate structure including one or more metallization layers;
forming a cell patch comprising a first switch contact on one of the one or more metallization layers;
forming a second switch contact on one of the one or more metallization layers, the second switch contact configured to be bridged to the first switch contact when a switch is actuated;
forming a first ground electrode on one of the one or more metallization layers, the first ground electrode conductively coupled to the cell patch through a conductive path; and
forming a feed structure on one of the one or more metallization layers, the feed structure coupled to the cell patch;
wherein the cell patch, the feed structure, and at least part of the substrate structure form a Composite Right/Left Handed (CRLH) antenna device structured to provide multiple resonant operating frequencies; and
wherein one or more of the first switch contact or the second switch contact is coupled to the first ground electrode using a frequency-selective coupling configured to suppress a shift in the multiple resonant operating frequencies between a state when the first and second switch contacts are isolated from each other as compared to a state where the first and second switch contacts are bridged.
8. The method as in claim 7 , wherein
the cell patch is capacitively coupled to the feed structure.
9. The metamaterial antenna device of claim 2 , wherein the feed structure and the cell patch are located on the same metallization layer of the substrate structure.
10. The metamaterial antenna device of claim 1 , wherein the cell patch is located on a first metallization layer of the substrate structure; and
wherein the first ground electrode is located on a second metallization layer of the substrate structure.
11. The metamaterial antenna device of claim 10 , wherein the first ground electrode is located outside of a footprint of the cell patch projected from the first metallization layer of the substrate structure to the second metallization layer of the substrate structure.
12. The metamaterial antenna device of claim 10 , comprising a second ground electrode located on the first metallization layer of the substrate structure.
13. The metamaterial antenna device of claim 1 , wherein the first switch contact comprises an outer conductive ring;
wherein the second switch contact comprises an inner electrode located on the same metallization layer as the outer conductive ring; and
wherein the second switch contact is located within an enclosed region formed by the outer conductive ring of the first switch contact.
14. The metamaterial antenna device of claim 1 , comprising one or more of an inductor or a capacitor coupled between the first switch contact and another switch contact, the one or more of the inductor or the capacitor configured to suppress conductive coupling of a communication signal between the cell patch comprising the first switch contact and another switch contact.
15. The method of claim 7 , wherein the cell patch is located on a first metallization layer of the substrate structure;
wherein the first ground electrode is located on a second metallization layer of the substrate structure; and
wherein the first ground electrode is located outside of a footprint of the cell patch projected from the first metallization layer of the substrate structure to the second metallization layer of the substrate structure.
16. The metamaterial antenna device of claim 1 , wherein the cell patch comprising the first switch contact is coupled to the first ground electrode using a frequency-selective coupling including an inductor and a capacitor.
17. The metamaterial antenna device of claim 16 , wherein one or more of the inductor or the capacitor includes a lumped component.
18. The metamaterial antenna device of claim 1 , wherein the second switch contact is coupled to the first ground electrode using a frequency selective coupling including an inductor and a capacitor.
19. The metamaterial antenna device of claim 18 , wherein one or more of the inductor or the capacitor includes a lumped component.
20. The method of claim 7 , wherein the cell patch comprising the first switch contact is coupled to the first ground electrode using a frequency-selective coupling including an inductor and a capacitor.
21. The method of claim 7 , if wherein the second switch contact is coupled to the first ground electrode using a frequency selective coupling including an inductor and a capacitor.