Capacitive Coupled Antenna Layout for Close-Range Isolation
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Solution Overview
Problem
When two antennas are brought closer, ensuring isolation between them is challenging, and existing techniques require separating the antennas and inserting a structure between them.
Innovation Solution
The antenna configuration includes a first substrate with conductors extending in a plane direction, a coupling conductor for capacitive coupling, a second substrate with a ground conductor and power supply, and pin members for electromagnetic connection, along with baluns on the second substrate to facilitate balanced-unbalanced conversion and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two antennas are brought closer to reduce device size, then the overall device volume decreases, but isolation between the antennas deteriorates
Solution Approach 1:
A ground conductor is introduced as an intermediary element between the first and second antennas. The ground conductor is positioned between the antennas and electrically connected to ground potential, creating electromagnetic shielding that maintains isolation between the antennas even when they are brought closer together, thus reducing overall device volume while preserving antenna isolation performance
2Reliability
If a separation structure is inserted between antennas to ensure isolation, then antenna isolation is improved, but device complexity increases
Solution Approach 1:
The ground conductor serves multiple functions simultaneously: it provides electromagnetic shielding between antennas, acts as a reference plane for impedance control, and can serve as a mounting surface for other components. This multi-functionality achieves antenna isolation without requiring separate dedicated isolation structures, thereby reducing overall device complexity
3Reliability
If antenna elements are separated to maintain isolation, then antenna isolation is improved, but antenna effective area decreases
Solution Approach 1:
The ground conductor is positioned in the vertical dimension (z-direction) between the two antennas, rather than requiring horizontal separation in the x-y plane. This three-dimensional arrangement allows the antennas to maintain their full effective area in the horizontal plane while achieving isolation through vertical positioning of the ground shield, thus preserving antenna effective area while ensuring 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
This configuration ensures effective isolation between antennas while reducing the antenna's size and loss, achieving a compact and efficient design.
Implementation Method 1
a coupling conductor disposed on another surface of the first substrate, the coupling conductor extending in the first plane direction, the coupling conductor capacitively coupling the first conductor, the second conductor, the third conductor, and the fourth conductor
Implementation Method 2
a first pin member configured to electromagnetically connect to the first conductor; a second pin member configured to electromagnetically connect to the second conductor; a third pin member configured to electromagnetically connect to the third conductor; a fourth pin member configured to electromagnetically connect to the fourth conductor
Data Source
AI summary
An antenna includes: a first substrate extending in a first plane direction; a first conductor, a second conductor, a third conductor, and a fourth conductor that are disposed on one surface of the first substrate and extend in the first plane direction; a coupling conductor disposed on another surface of the first substrate, the coupling conductor extending in the first plane direction, the coupling conductor capacitively coupling the first conductor, the second conductor, the third conductor, and the fourth conductor; a second substrate including one surface facing the other surface of the first substrate, the second substrate extending in the first plane direction; a first pin member; a second pin member; a third pin member; a fourth pin member; and a balun.