Compact High-Frequency Filter Using Hybrid Coupler Resonators
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Solution Overview
Problem
Conventional high-frequency electronic devices, such as microstrip line filters, are large in size and require high precision in conductor patterns, which limits their miniaturization and manufacturing efficiency.
Innovation Solution
The electronic device comprises a coupler and a filter, utilizing a 90-degree hybrid coupler and line configurations with capacitors and resistance elements to selectively pass high-frequency signals, allowing for reduced size and precision requirements, and enabling operation as high-pass or low-pass filters with adjustable attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microstrip line filter is used for high-frequency signal processing, then filtering function is achieved, but the device size becomes large and manufacturing precision requirements increase
Solution Approach 1:
The filter is divided into multiple resonator sections (first resonator, second resonator, etc.) that are coupled together. Each resonator is a separate functional unit that contributes to the overall filtering characteristics, allowing the large filtering function to be segmented into manageable small components
Solution Approach 2:
The patent transitions from traditional microstrip line configurations to a resonator-based structure that utilizes electromagnetic resonance in specific frequency bands. This dimensional change in the approach (from distributed parameter microstrip to lumped parameter resonators) enables compact size while maintaining filtering performance
2Reliability
If a microstrip line filter is used for high-frequency signal processing, then filtering function is achieved, but manufacturing precision requirements increase
Solution Approach 1:
By segmenting the filter into discrete resonator units with clear coupling structures, the manufacturing process becomes more standardized. Each resonator can be fabricated as a modular component, reducing the cumulative precision errors that would occur in continuous microstrip line fabrication
Solution Approach 2:
The patent changes the design parameters from microstrip line dimensions (width, length, spacing) to resonator parameters (inductance, capacitance, coupling coefficients). This parameter transformation allows for more tolerant manufacturing specifications while achieving the same filtering characteristics
3Ease of operation
If conventional coupler designs are used for signal distribution, then signal distribution is achieved, but device complexity and size increase
Solution Approach 1:
The coupler functionality is merged with the resonator structures. The same resonant elements that provide filtering also perform signal distribution through their coupling characteristics, eliminating the need for separate coupler components and reducing overall device complexity
Solution Approach 2:
The resonator structures serve multiple functions simultaneously: they provide frequency-selective filtering, signal distribution through coupling, and impedance transformation. This multi-functionality reduces the total number of components needed in the high-frequency circuit
Data Source
AI summary
An electronic device comprises a divider and a first filter. The divider comprises a first terminal for inputting a high-frequency signal, a second terminal coupled to the first terminal, and third and fourth terminals for distributing thereto the signal inputted from the first terminal. The first filter is coupled to the second terminal.