Antenna card for controlling and tuning antenna isolation to support carrier aggregation

An antenna, coupled current technology, applied in the third generation partnership project long-term evolution network, wireless or cellular communication antenna field, can solve the problem of mutual coupling increase

CN106025548AInactive Publication Date: 2016-10-12INTEL IP CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-10-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an antenna card for controlling and tuning antenna isolation to support carrier aggregation. 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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Description

technical field

[0001] Some embodiments relate to antennas for wireless or cellular communications. Some embodiments relate to Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) networks. Background technique

[0002] Mutual coupling between multiple antennas disposed on the same platform of a mobile device is a limiting factor for multiple-input multiple-output (MIMO) antenna designs, which require a modest level of isolation. These antennas use the entire printed circuit board (PCB) for radiation and the mutual coupling increases significantly when considered for use in the low frequency bands in Long Term Evolution (LTE). In specific applications, even higher levels of isolation than currently used are required. As an example, at least one architecture requires 25dB isolation as antenna isolation required for all operating frequency bands (even low frequency bands). There is a need for an antenna isolation structure capable of controlling antenna iso...

Examples

Embodiment Construction

[0018] Antenna isolation is very important for the antenna front end of smartphones and similar mobile devices. Therefore, the development of reliable, general and practical isolation mechanisms is the key to success. Practical problems arise when implementing decoupling methods into products. Many methods rely on well-defined near-field distributions and symmetries to achieve decoupling. Perturbations in the near field will seriously hinder performance. From a smart device front-end antenna perspective, the most difficult requirement is in-band continuous carrier aggregation (CA), since the system relies on narrowband tuned antennas for isolation. In this context, a narrowband antenna refers to an antenna that covers a smaller portion of the frequency band than either the RX antenna or the TX antenna at any given moment.

[0019] For the low frequency bands (699-960MHz) used in LTE, the antenna uses essentially the entire printed circuit board (PCB) for radiation, and the ...