Multiple antenna diversity for wireless LAN applications
First Claim
Patent Images
1. An antenna system comprising at least two antennas for providing diversity operation, the antenna system comprising:
- a first antenna having first signal polarization characteristic and a first radiation pattern shape;
a second antenna, independently excitable from the first antenna at a different time, the second antenna exhibiting a second signal polarization characteristic and a second radiation pattern shape, the first signal polarization characteristic having a different orientation than the second signal polarization characteristic and the first radiation pattern having a different shape than the second radiation pattern; and
wherein the signal polarization and radiation pattern presented by the antenna system are selectable, wherein the antenna system transmits a first signal with the first signal polarization characteristic and the first radiation pattern shape when the first antenna is excited or transmits a second signal with the second signal polarization characteristic and the second radiation pattern shape when the second antenna is excited.
12 Assignments
0 Petitions
Accused Products
Abstract
An antenna system comprising a plurality of antennas designed and oriented to provide one or more of radiation pattern, signal polarization and spatial diversity. The various diversity operational characteristics are achieved by using similar antennas physically oriented to provide the diversity attributes or by using dissimilar antennas, that is, antennas having different radiation pattern and/or signal polarization characteristics.
77 Citations
15 Claims
-
1. An antenna system comprising at least two antennas for providing diversity operation, the antenna system comprising:
-
a first antenna having first signal polarization characteristic and a first radiation pattern shape; a second antenna, independently excitable from the first antenna at a different time, the second antenna exhibiting a second signal polarization characteristic and a second radiation pattern shape, the first signal polarization characteristic having a different orientation than the second signal polarization characteristic and the first radiation pattern having a different shape than the second radiation pattern; and wherein the signal polarization and radiation pattern presented by the antenna system are selectable, wherein the antenna system transmits a first signal with the first signal polarization characteristic and the first radiation pattern shape when the first antenna is excited or transmits a second signal with the second signal polarization characteristic and the second radiation pattern shape when the second antenna is excited. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An antenna system comprising at least two meanderline antennas for providing diversity operation, the antenna system comprising:
-
a first meanderline antenna; a second meanderline antenna oriented with respect to the first meanderline antenna to present a different signal polarization and radiation pattern with respect to the first meanderline antenna; a controller for selecting the operative antenna from between the first meanderline antenna and the second meanderline antenna based on a provided signal quality metric, wherein a selected antenna is independently and separately excited such that the antenna system transmits a first signal having a first signal polarization orientation and a first radiation pattern shape when the first antenna is selected and having a second signal polarization orientation and a second radiation pattern shape when the second antenna is selected; wherein the first and the second meanderline antennas are mounted on a planar structure, and wherein the first and the second meanderline antennas are connected to a common ground plane disposed on the planar structure. - View Dependent Claims (11, 12)
-
-
13. A antenna system comprising a plurality of antennas for providing diversity operation, the antenna system comprising:
-
a first pair of antennas having different signal polarization orientation characteristics from each other; a second pair of antennas having different radiation pattern shape characteristics from each other; and a controller for determining an operative antenna from the first pair of antennas and for determining an operative antenna from the second pair of antennas such that the antenna system presents a desired signal polarization characteristic and a desired radiation pattern characteristic. - View Dependent Claims (14, 15)
-
Specification