Stamped Interdigital RF Filter with Folded Tuned Elements
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Solution Overview
Problem
Existing RF filters, particularly interdigital bandpass filters, face challenges in achieving high performance while being cost-effective and scalable for high-volume applications. They often require expensive manufacturing techniques, such as machining or specialized PCB materials, and may not effectively handle high signal power or provide sharp roll-off characteristics.
Innovation Solution
The development of an interdigital bandpass RF filter using low-cost, high-volume metal stamping techniques, where the filter structure is configured with a filter chamber and tuned elements that are folded into a shape occupying space between a top lid and a ground plane, or located above the ground plane on a single side. This configuration connects to a printed circuit board (PCB) via pins, forming a mostly enclosed structure that mitigates RF signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional machining or specialized PCB materials are used to manufacture interdigital bandpass filters, then high performance and sharp roll-off characteristics are achieved, but manufacturing cost increases and scalability for high-volume applications decreases
Solution Approach 1:
The patent replaces traditional mechanical machining processes with metal stamping technology to manufacture interdigital bandpass filters. This substitution enables high-volume production at lower costs while maintaining the required manufacturing precision for filter performance through precision stamping dies and controlled forming processes.
Solution Approach 2:
The patent changes the manufacturing parameters by transitioning from low-volume machining operations to high-volume stamping processes. This includes modifying material forms (from stock removal to formed sheets), adjusting production rates, and optimizing stamping parameters to achieve both cost-effectiveness and the sharp roll-off characteristics required for filter performance.
2Reliability
If traditional machining techniques are used to create interdigital filters, then high performance is achieved, but scalability for high-volume applications is limited
Solution Approach 1:
The patent replaces traditional mechanical machining with metal stamping technology, which inherently supports high-volume production. The stamping process can produce multiple filters simultaneously through progressive dies and automated feeding, dramatically increasing productivity and scalability while maintaining consistent filter performance through precise die design and control.
3Object-affected harmful factors
If enclosed filter chamber structure with folded tuned elements is used, then RF signal interference is mitigated and sharp roll-off characteristics are achieved, but device complexity increases
Solution Approach 1:
The patent implements nesting by folding the tuned elements into a compact configuration that occupies space within the filter chamber between the top lid and ground plane. This nested arrangement creates an enclosed structure that mitigates RF interference while maintaining a compact overall form factor, effectively managing the complexity through spatial organization rather than adding separate components.
Solution Approach 2:
The patent utilizes the third dimension by folding tuned elements vertically within the filter chamber space. This dimensional approach allows the elements to be compactly arranged between the top lid and ground plane, creating an enclosed structure for interference mitigation without increasing the filter's footprint, thus managing complexity through efficient spatial utilization.
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 achieves a high-performance bandpass filter with improved cost-effectiveness and scalability, capable of handling high signal power and providing sharp roll-off characteristics, thereby effectively mitigating RF signal interference between specific frequency ranges.
Implementation Method 1
an interdigital bandpass RF filter can be produced using progressive-die stamping or other suitable forming techniques
Implementation Method 2
an outer perimeter that connects to a ground plane present on the connection medium, wherein the ground plane forms a bottom of the filter chamber
Implementation Method 3
a plurality of tuned elements including first tuned elements and last tuned elements
Data Source
AI summary
A bandpass filter can be configured, which includes a filter structure that includes a filter chamber and a group of tuned elements including first tuned elements and last tuned elements, wherein the first tuned elements and the last tuned elements include a pin that joins a connection medium to connect to a radio frequency (RF) signal path. An outer perimeter can connect to a ground plane present on the connection medium. The ground plane can form a bottom of the filter chamber. The group of tuned elements can be folded into a shape that occupies a space midway between a top lid and the ground plane. Alternatively, the group of tuned elements can be located above the ground plane on a single side of the filter structure.