Wireless Filter Using Cascade Resonant Circuits for Cost Reduction
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Solution Overview
Problem
Conventional filters for wireless communication devices with concurrent dual-radio operation are costly and large due to high manufacturing processes and increased order, leading to larger size, higher insertion loss, and worse amplitude flatness.
Innovation Solution
A filter design where both ends of an energy storage element are connected in cascade with series and parallel resonant circuits, allowing for reduced manufacturing costs and device minimization without increasing filter order, using chip-type elements for compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filters (FBAR or DRF) are used to achieve steep filtering curve and high isolation, then filtering performance is improved, but manufacturing cost increases and device area increases
Solution Approach 1:
The patent replaces expensive conventional filters (FBAR or DRF) with a filter constructed from inexpensive chip-type inductors and capacitors. This substitution uses readily available, low-cost components to achieve the required filtering performance without relying on specialized expensive filter technologies, thereby significantly reducing manufacturing cost while maintaining adequate filtering characteristics.
Solution Approach 2:
The patent optimizes the filter design by carefully selecting and adjusting the parameters (inductance values and capacitance values) of the chip-type inductors and capacitors. By changing these parameters and optimizing their combinations, the filter achieves steep filtering curves and high isolation using low-cost components, resolving the contradiction between cost and performance.
2Reliability
If the order of the filter is increased to increase attenuation, then filtering performance is improved, but filter size increases and insertion loss increases
Solution Approach 1:
The patent combines multiple chip-type inductors and capacitors into a compact filter structure where components are integrated in a space-efficient arrangement. By merging the functions of multiple components into a compact configuration, the filter achieves high attenuation without proportionally increasing the overall filter size, thus resolving the contradiction between attenuation and physical dimensions.
Solution Approach 2:
The patent transitions from increasing filter order (which traditionally increases size) to optimizing the dimensional arrangement and connectivity of chip-type components. By changing the spatial dimensionality and configuration of the filter circuit rather than simply adding more components in sequence, the filter achieves high attenuation while maintaining compact size and avoiding excessive insertion loss.
3Reliability
If the order of the filter is increased to increase attenuation, then filtering performance is improved, but amplitude flatness deteriorates
Solution Approach 1:
The patent achieves high attenuation while maintaining good amplitude flatness by optimizing the parameters (inductance and capacitance values) of the chip-type components. Through careful parameter selection and adjustment, the filter design compensates for the effects of high filter order, ensuring that amplitude flatness is maintained even as attenuation increases, thereby resolving the contradiction between these two performance metrics.
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 filter achieves effective attenuation and minimization of the wireless communication device with improved frequency response and reduced size, addressing the limitations of conventional filters by maintaining steep filtering curves and high isolation without increasing filter order.
Implementation Method 1
a first series resonant circuit and a first parallel resonant circuit which are connected in cascade between a first end of the first energy storage element and a ground
Data Source
AI summary
A wireless communication device and a filter are provided. The filter has an input end and an output end and includes a first energy storage element, a first series resonant circuit, a second series resonant circuit, a first parallel resonant circuit and a second parallel resonant circuit. The first and the second series resonant circuits respectively have a first capacitor and a first inductor connected in series. The first and the second parallel resonant circuits respectively have a second capacitor and a second inductor connected in parallel. The first series resonant circuit and the first parallel resonant circuit are electrically connected in cascade between a first end of the first energy storage element and a ground, and the second series resonant circuit and the second parallel resonant circuit are electrically connected in cascade between a second end of the first energy storage element and the ground.