Dual-Mode Antenna Layout for Compact Isolation in Shared Volume
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Solution Overview
Problem
Conventional antenna arrangements in electronic devices face challenges with limited space due to large displays, leading to reduced performance and inefficient coupling between antennas, especially when using inverted F antennas (IFA), which require significant volume and narrow operation bandwidth.
Innovation Solution
An antenna arrangement comprising a differential mode antenna and a common mode antenna, sharing a single radiating element, with specific current amplitude and phase relations to minimize mutual coupling, allowing compact placement and improved isolation, enabling operation in multiple frequency ranges including 5G NR bands n77 and n79, and WLAN5.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If inverted F antennas (IFA) are placed close to each other to reduce volume, then the antenna volume is reduced, but the isolation between antennas deteriorates and efficiency is reduced
Solution Approach 1:
The patent combines two separate IFA antennas into a single integrated antenna structure that supports both differential mode and common mode operations. The differential mode antenna elements and common mode antenna elements share the same physical space and radiating structures, achieving volume reduction while maintaining isolation through mode separation rather than physical separation.
Solution Approach 2:
The integrated antenna structure serves multiple functions: it operates as a differential mode antenna for one frequency range and as a common mode antenna for another frequency range. The same physical structure performs multiple antenna functions, eliminating the need for separate antenna volumes while maintaining performance through proper mode excitation and isolation.
2Reliability
If decoupling structures such as neutralization lines are introduced between antennas to improve isolation, then antenna isolation is improved, but the operation bandwidth is reduced and the antenna volume is increased
Solution Approach 1:
Instead of adding separate decoupling structures between two antennas, the patent merges the antenna functions into a single integrated structure where decoupling is achieved through mode separation. The differential mode and common mode operations are isolated by their excitation schemes and current distributions, not by additional decoupling elements, thus preserving bandwidth and avoiding volume increase.
Solution Approach 2:
The patent changes the operational parameters by utilizing two different excitation modes (differential and common mode) with different current amplitude and phase relations. This parameter change allows the same physical structure to achieve isolation without adding decoupling structures, thereby maintaining wide bandwidth and compact volume.
3Area of stationary object
If antennas are packed closely in a shared space to maximize display area, then the display area is increased, but the antenna efficiency is reduced due to coupling
Solution Approach 1:
The patent merges multiple antenna functions into a single compact structure that can be placed in the limited space available next to the display. By combining differential mode and common mode antenna elements in one integrated structure, the display area is maximized while antenna efficiency is maintained through mode-based isolation rather than spatial separation.
Solution Approach 2:
The integrated antenna structure provides universal functionality by supporting both differential mode and common mode operations, allowing a single compact antenna to replace what would traditionally require multiple separate antennas. This multi-functionality enables close packing near the display without sacrificing efficiency, as the different modes provide natural isolation.
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
The solution achieves a compact antenna arrangement with improved efficiency and isolation, reducing volume by at least 50% compared to IFA, with 2dB better N79 and WLAN5 efficiencies, and over 6dB improved isolation, supporting multiple frequency bands.
Implementation Method 1
at least one differential antenna feed (4) configured to induce differential mode currents (I1, I2) in the radiating element (3)
Implementation Method 2
at least one common antenna feed (5) configured to induce common mode currents (I3, I4) in the radiating element (3)
Data Source
Figure 1
Figure 2a~2b
Figure 3a
AI summary
An antenna arrangement (1) comprising a differential mode antenna (1a) and a common mode antenna (1b), the antenna arrangement (1) comprising an antenna structure (2) comprising one radiating element (3), at least one differential antenna feed (4) configured to induce differential mode currents (I1, I2) in the radiating element (3), and at least one common antenna feed (5) configured to induce common mode currents (I3, I4) in the radiating element (3). The antenna structure (2) is configured to excite a first radiofrequency range and a second radiofrequency range in response to the differential mode currents (I1, I2) and the common mode currents (I3, I4). The antenna arrangement (1) further comprises at least one first antenna element (6) operably coupled to the differential antenna feed (4), such that the differential mode antenna (1a) is formed, and at least one second antenna element (7) operably coupled to the common antenna feed (5), such that the common mode antenna (1b) is formed,. The first antenna element (6) and the second antenna element (7) are configured to excite a third radiofrequency range in response to the differential mode currents (I1, I2) and/or the common mode currents (I3, I4). This arrangement makes it possible to locate two antennas in the same given volume while maintaining a high level of isolation between the antennas.