Indirect Coupler for Multi-Antenna Isolation in Compact Wireless Devices
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Solution Overview
Problem
Modern wireless devices face challenges in accommodating multiple antennas due to space constraints, leading to compromised antenna performance due to interference and limited volume availability, especially when trying to place antennas next to other components like USB connectors and buttons.
Innovation Solution
The use of an indirect coupler that electromagnetically couples multiple antenna elements operating at different frequencies within the same volume, allowing for improved bandwidth and isolation between antennas, enabling efficient communication even when placed closely together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple antennas are placed in limited device space, then antenna quantity increases to support MIMO and carrier aggregation, but antenna performance deteriorates due to interference and coupled interference from nearby components
Solution Approach 1:
A coupler element is introduced as an intermediary component between the first and second antenna elements. This coupler element mediates the electromagnetic interaction between the antennas, enabling them to be placed in close proximity while maintaining isolation. The coupler element acts as a buffer that manages the electromagnetic fields, preventing direct interference between the antenna elements and allowing multiple antennas to coexist in limited space without compromising performance
2Reliability
If antenna volume is increased to improve performance, then S11 and radiated efficiency improve, but device volume increases which is not acceptable for smartphones
Solution Approach 1:
The coupler element is integrated within the same volume as the antenna elements, merging the coupling function into the existing antenna structure rather than requiring separate dedicated space. The coupler element shares the limited device volume with the antenna elements, allowing the system to achieve good isolation and performance without increasing the overall device volume. This merging approach enables multiple antennas to be packed closely together in the circumferential region of the smartphone
3Adaptability or versatility
If antennas are placed near other components like USB connector and buttons, then device layout flexibility improves, but antenna performance worsens due to coupled interference
Solution Approach 1:
The coupler element serves as a protective intermediary that shields the antenna elements from interference caused by nearby components such as USB connectors and buttons. By positioning the coupler element between the antennas and other components, it creates an electromagnetic buffer zone that reduces coupled interference, allowing the antennas to be placed in flexible locations around the device circumference without compromising performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances antenna performance by maintaining good isolation and efficiency between antennas with overlapping frequency ranges, reducing interference and allowing for compact antenna configurations in limited device spaces.
Implementation Method 1
an indirect coupler configured to indirectly couple the first antenna element with a feed signal component for transmitting and receiving communications
Implementation Method 2
a first antenna element, located within a first antenna volume of a body, configured to operate at a first resonant frequency range. A second antenna element is located within a second antenna volume of the body that is adjacent to the first antenna element... configured to operate at a second resonant frequency range that is a subset of the first resonant frequency range
Data Source
AI summary
A first antenna element is indirectly coupled to communication signals via a coupler that is located within a same volume of a body. A second antenna element is proximate to and adjacent the first antenna element. The first antenna element is configured to operate in a first frequency range and the second antenna element is configured to operate within a subset of the first frequency range concurrent with or simultaneously to the first antenna element. The coupler can operate to couple multiple antenna elements operating at different frequencies within the same volume of the body.