Adaptive receive and omnidirectional transmit antenna array
View Patent ↗An adaptive antenna used in a receive only mode with a separate omnidirectional transmit antenna. The arrangement is especially effective for small, handheld wireless devices. The transmit antenna maybe integrated with the receive array by utilizing a horizontally polarized transmit and vertically polarized receiver ray. In other embodiments, the transmit antenna may be physically separate and not integrated with the receive array. In either case there is separate receive and transmit signal port as an interface to radio transceiver equipment. The use of an adaptive antenna in the receive only direction has the potential to increase forward links capacity to levels equal to or greater than reverse link capacity. This allows for a significant increase in the overall number of users that may be active at the same time in a wireless system.
1. An adaptive antenna array intended for use in a mobile communication device comprising:
an adaptive directional receive antenna array for signal reception; and
an omnidirectional transmit antenna for signal transmission;
the adaptive directional receive antenna array and the transmit antenna being integrated into a housing of a hand portable device.
2. A device as in claim 1 wherein the adaptive receive array comprises at least one parasitic element.
3. A device as in claim 1 wherein the transmit antenna comprises a radiating element disposed at a different polarization with respect to at least one of a plurality of elements of the receive array.
4. A device as in claim 3 wherein the receive array is vertically polarized and the transmit antenna is horizontally polarized.
5. A device as in claim 3 wherein the transmit antenna polarization is orthogonal to receive array polarization.
6. A device as in claim 1 wherein the omnidirectional transmit antenna is physically separated from the receive array.
7. A device as in claim 1 wherein the mobile communication device is used with Time-Division Duplex system, whereby the array is used during transmit time periods be forced to operate in a directive mode during at least some of a receive time period.
8. A device as in claim 1 wherein the device uses a Code Division Multiple Access modulation.
9. A device as in claim 1 wherein an Orthogonal Frequency Division Multiplex modulation is used.
10. A device as in claim 1 wherein the omnidirectional transmit antenna and the adaptive receive antenna array are integrated on a single dielectric substrate.
11. A device as in claim 1 wherein the omnidirectional transmit antenna is located at a base of the housing of the hand portable device and the receive array is located in a top portion of the housing.
12. A device as in claim 1 wherein the omnidirectional transmit antenna and the receive array are both located in a top portion of the housing of the handheld portable device.
13. A device as in claim 1 wherein the omnidirectional transmit antenna is bent.
14. A device as in claim 1 wherein the omnidirectional transmit antenna is attached to a rear portion of the housing.
15. A device as in claim 14 whererin the omnidirectional transmit antenna includes a hinge for extending and retracting a length of the transmit antenna.
16. A device as in claim 1 wherein the adaptive directional receive antenna array comprises an active antenna element and at least one passive antenna element.
17. A device as in claim 16 comprising a switch for coupling the at least one passive antenna element to one or more impedances in order to affect the directivity of the the adaptive directional receive antenna array.
18. A device as in claim 1 wherein a portion of the adaptive directional receive antenna array extends through the housing of the hand portable device.
19. An adaptive antenna array intended for use in a mobile communication device comprising:
an adantive directional receive antenna array for signal reception; and
an omnidirectional transmit antenna for signal transmission, the omnidirectional transmit antenna being physically separated from the receive array. the omnidirectional transmit antenna being located at the base of a handheld unit where the receive array is located in a top portion.