Loop Antenna Magnetic Coupling for Radio Isolation
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Solution Overview
Problem
Existing loop antennas in mobile devices often require separate antennas for cellular and complementary wireless systems, leading to space and cost inefficiencies, as well as potential interference between radio systems.
Innovation Solution
A loop antenna design featuring a loop element with a feed contact and a ground contact, where an open-ended conductor is magnetically coupled around the ground contact, allowing for the integration of both radio systems using the same physical antenna structure without physical connection, thereby achieving isolation through magnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate antennas are used for cellular and complementary wireless systems, then radio system isolation is achieved, but device space consumption and manufacturing cost increase
Solution Approach 1:
The patent combines cellular and complementary wireless system antennas into a single shared antenna structure. The loop antenna element serves both radio systems simultaneously, eliminating the need for separate physical antennas and reducing overall device space consumption while maintaining proper signal isolation through selective coupling mechanisms.
Solution Approach 2:
The shared antenna structure is designed to perform multiple functions - serving both cellular and complementary wireless systems (such as GPS, WLAN, Bluetooth) through a single physical antenna element. This multi-functional approach allows one antenna to replace what would traditionally require multiple separate antennas, reducing both space and cost.
2Object-affected harmful factors
If separate antennas are used for cellular and complementary wireless systems, then radio system isolation is achieved, but manufacturing cost increases due to additional components
Solution Approach 1:
The patent merges the antenna structures for cellular and complementary wireless systems into a single shared antenna, eliminating the need for multiple separate antennas, additional contact springs, and extra filtering components. This consolidation directly reduces manufacturing complexity and material costs.
Solution Approach 2:
The invention extracts and eliminates unnecessary components such as additional contact springs and excessive filtering elements that would be required in a multi-antenna design. By using a shared antenna with selective coupling, the design removes redundant parts, simplifying manufacturing and reducing cost.
3Area of stationary object
If a shared antenna structure is used for both radio systems, then space and cost efficiency are improved, but radio system isolation deteriorates
Solution Approach 1:
The patent introduces an intermediary coupling mechanism - a magnetic coupling element or transformer - that mediates between the shared antenna and the different radio systems. This intermediary enables selective coupling to the loop antenna element, allowing one radio system to access the antenna while isolating the other, thereby maintaining proper signal isolation despite the shared physical structure.
Solution Approach 2:
The invention utilizes parameter changes in the coupling mechanism to control which radio system accesses the shared antenna at different times or under different conditions. By adjusting coupling parameters (such as magnetic coupling strength or circuit configuration), the system dynamically controls signal paths to maintain isolation between cellular and complementary wireless systems while sharing the same antenna structure.
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 design provides effective isolation between cellular and complementary wireless systems, reducing the need for additional filtering and contact springs, resulting in cost savings and improved industrial design, while enhancing GPS antenna radiation characteristics and reducing head loss for WLAN antennas.
Implementation Method 1
an open ended conductor that is magnetically coupled around the ground contact
Data Source
AI summary
A loop antenna with a magnetically coupled element is described. In an embodiment, the loop antenna comprises a loop element that has a feed contact and a ground contact. The loop antenna further comprises an open ended conductor that is magnetically coupled around the ground contact.