Battery Connection Tab Radiating Element for RF Isolation
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Solution Overview
Problem
The use of battery connection tabs as antennas in tire pressure monitoring devices and other mobile devices leads to signal interference due to parasitic impedance variations over time, making it difficult to model and stabilize radiofrequency performance.
Innovation Solution
An additional connection tab is secured to the battery terminal to form a radiating element with an existing connection tab, allowing radiofrequency signals to pass around the battery without traversing its interior, thus isolating the antenna from the battery's internal parasitic impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If connection tabs are used as antennas, then device complexity and manufacturing cost are reduced, but radiofrequency performance deteriorates due to parasitic impedance variations
Solution Approach 1:
The invention divides the antenna system into two separate functional parts: the connection tabs remain dedicated to electrical power supply functions, while a distinct radiating element (such as a printed circuit board trace or separate antenna structure) handles radiofrequency signals. This segmentation eliminates the interference between power transmission and RF signal functions, resolving the parasitic impedance issue while maintaining manufacturing simplicity.
Solution Approach 2:
The invention extracts the antenna function from the connection tabs by introducing a separate radiating element. The connection tabs are taken out from their dual role and dedicated solely to electrical connection, while the RF antenna function is assigned to a separate structure that does not suffer from battery parasitic impedance effects.
2Ease of manufacture
If connection tabs are positioned on either side of the battery, then electrical connection is simplified, but signal quality deteriorates as signals pass through the battery
Solution Approach 1:
The invention introduces an intermediary radiating element that mediates between the connection tabs and the RF signal transmission. This intermediary structure allows RF signals to be transmitted without passing through the battery, eliminating the harmful parasitic impedance effects while maintaining the simple side-positioned connection tab arrangement for ease of manufacture.
3Ease of manufacture
If battery dimensions and materials are fixed, then manufacturing is simplified, but antenna performance deteriorates due to unmodelable parasitic impedance
Solution Approach 1:
The invention extracts the RF antenna function from the battery structure itself by introducing a separate radiating element. This allows the battery to maintain fixed dimensions and materials for simplified manufacturing, while the antenna performance is determined by the separate radiating element that is not affected by battery parasitic impedance variations.
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 eliminates the dependence on battery aging parameters and chemical characteristics, stabilizing radiofrequency performance and simplifying manufacturing by preventing signal interference within the battery.
Implementation Method 1
at least one third connection tab is fixed to one of the terminals of the battery in order to transmit or receive radiofrequency signals in combination with the connection tab that is secured to the same terminal of the battery
Data Source
AI summary
Disclosed is a battery having a positive terminal and a negative terminal and two electrical connection tongues, each tongue secured to one of the terminals thereof. The battery also includes at least one additional connection tongue secured to one of the terminals thereof, forming a radiating element with the electrical connection tongue secured to the same terminal of the battery.