Active UHF/VHF antenna
An active antenna for UHF/VHF signal receiving is described, the active antenna being capable of configuration in one of a plurality of possible modes. The active antenna includes an antenna element configured for multiple resonances in the UHF/VHF bands, and capable of generating multiple radiation modes as well as active impedance matching using a microprocessor and multi-port switch having variable or multiple selectable modes. The active antenna may include a second antenna element arranged in a right-angle orientation with respect to the first antenna element. The first antenna element, second antenna element, or a combination may be selected for receiving signals in at a desired frequency. A three-dimensional antenna assembly is also described. Each of the examples illustrate an active beam steering antenna capable of UHF/VHF signal receiving.
1. An active antenna, comprising:
a first substrate;
a first antenna element positioned on the first substrate adjacent to a ground plane, the first antenna element coupled to a first conductor at a first filter, the first antenna element further coupled to a second conductor at a second filter, the first antenna element configured for multiple resonances in the UHF and VHF bands;
a first parasitic element positioned adjacent to the first antenna element and the ground plane, wherein the first parasitic element is coupled to the ground plane at a first multi-port switch;
the first multi-port switch configured to open-circuit, short-circuit, or reactively load the first parasitic element;
the first multi-port switch coupled to a first processor, and the first processor configured to further couple with a television receiver circuit,
wherein the first processor is configured to receive channel selection information from the television receiver circuit, and using an algorithm resident in the first processor, determine an optimal mode of the active antenna, and communicate control signals to the first multi-port switch for configuring the active antenna in the optimal mode.
2. The active antenna of claim 1 , wherein the first processor is further configured to control a first matching circuit for matching the first antenna element at a first antenna feed.
3. The active antenna of claim 1 , wherein the first filter comprises an LC circuit.
4. The active antenna of claim 1 , wherein the second filter comprises a low pass filter.
5. The active antenna of claim 1 , wherein the second conductor is further coupled to a third conductor at a third filter.
6. The active antenna of claim 5 , wherein the third filter comprises an inductor.
7. The active antenna of claim 5 , wherein the third conductor is further coupled to the ground plane at a second multi-port switch.
8. The active antenna of claim 7 , wherein each of the first and second multi-port switches are coupled to the first processor and configured to receive control signals therefrom for independently controlling a state of each of the first and second multi-port switches.
9. The active antenna of claim 5 , wherein each of the first through third filters individually comprises: a passive reactive component, a tunable reactive component, a plurality of reactive components, or a combination thereof.
10. The active antenna of claim 1 , wherein the first antenna element comprises a first bypass junction for providing a reduced electrical path for high frequency signals.
11. The active antenna of claim 1 , wherein the optimal mode is determined by the algorithm based on receive signal strength indicator (RSSI) sampled from the active antenna in up to each of a plurality of possible modes.
12. The active antenna of claim 11 , wherein the optimal mode is the mode of the antenna with optimum RSSI from all available modes.
13. The active antenna of claim 11 , wherein the optimal mode is the first mode discovered by the first processor achieving a minimum acceptable RSSI.
14. The active antenna of claim 1 , further comprising a first ground plane extension disposed adjacent to the first antenna element.
15. The active antenna of claim 1 , further comprising a second antenna element and a second parasitic element positioned adjacent to the second antenna element, wherein the second antenna element is oriented perpendicular with respect to the first antenna element.
16. The active antenna of claim 15 , wherein the second antenna element and the second parasitic element are configured as mirror opposites of the first antenna element and the first parasitic element.
17. The active antenna of claim 15 , further comprising a two-port switch coupled to each of the first and second antenna elements and further coupled to the processor, wherein the two-port switch is configured to select the first antenna element, the second antenna element, or a combination of the first and second antenna elements for signaling.
18. The active antenna of claim 1 , further comprising a second substrate oriented perpendicular with respect to the first substrate, the second substrate comprising a second antenna element and a second parasitic element disposed thereon.
19. The active antenna of claim 18 , wherein the second antenna element is arranged at a ninety degree angle with respect to the first antenna element.
20. The active antenna of claim 19 , wherein the second antenna element is further arranged as a mirror image with respect to the first antenna element.
21. The active antenna of claim 19 , wherein the second antenna element is further rotated with respect to the first antenna element.