Antenna card for controlling and tuning antenna isolation to support carrier aggregation
First Claim
1. An antenna device comprising:
- a first antenna on a ground plane;
a second antenna on the ground plane, the first antenna and the second antenna operating in a frequency band; and
at least one slot in the ground plane, the at least one slot located between and separated from the first antenna and the second antenna and not resonant in the frequency band, wherein the at least one slot provides a radio frequency isolation between the first antenna and the second antenna via a path of variable electrical length that provides a coupling current between the first antenna and the second antenna, wherein the at least one slot is configured to operate as a variable reactance to vary the electrical length of the path, wherein at least some of the coupling current runs through the slot when the variable reactance tunes the slot for maximum radio frequency isolation.
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Accused Products
Abstract
An apparatus and method to provide isolation between a first antenna and a second antenna, each of which is located on a ground plane. A slot that is tunable by a variable reactance is located on the ground plane, the slot not being appreciably resonant at the operating frequency of the first antenna and the second antenna. The antennas operate in an orthogonal mode. Varying the slot reactance varies the electrical distance over which the coupling current between the two antennas flows. Increased RF isolation to a desired magnitude results by maintaining the orthogonality at desired bands. The RF isolation can be measured and a departure from the desired magnitude of isolation causes the reactance to be varied to increase the RF isolation back to the desired magnitude. The antennas and the slot are placed at locations on the ground plane of high current density.
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Citations
27 Claims
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1. An antenna device comprising:
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a first antenna on a ground plane; a second antenna on the ground plane, the first antenna and the second antenna operating in a frequency band; and at least one slot in the ground plane, the at least one slot located between and separated from the first antenna and the second antenna and not resonant in the frequency band, wherein the at least one slot provides a radio frequency isolation between the first antenna and the second antenna via a path of variable electrical length that provides a coupling current between the first antenna and the second antenna, wherein the at least one slot is configured to operate as a variable reactance to vary the electrical length of the path, wherein at least some of the coupling current runs through the slot when the variable reactance tunes the slot for maximum radio frequency isolation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. User Equipment (UE) comprising:
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a one radio comprising signal processing circuitry; a first antenna on a ground plane and a second antenna on the ground plane, the first antenna and the second antenna operating in a frequency band, the first antenna and the second antenna coupled to the signal processing circuitry to send and receive radio signals; and a UE component for providing antenna isolation, the UE component including at least one slot in the ground plane, the at least one slot located between and separated from the first antenna and the second antenna and not resonant in the frequency band, wherein the at least one slot provides radio frequency isolation between the first antenna and the second antenna via a path of variable electrical length that provides coupling current between the first antenna and the second antenna, wherein the at least one slot is configured to operate as a variable reactance to vary the electrical length of the path, wherein at least some of the coupling current runs through the slot when the variable reactance tunes the slot for maximum radio frequency isolation. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification