Tunable Hybrid Reflection Filter for Multi-Band Wireless
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Solution Overview
Problem
Current RF filters are inadequate for multi-band, multi-standard, and cognitive communication systems due to their inability to provide tunable and reconfigurable frequency responses, leading to large footprints, high costs, and increased insertion loss in wireless communication devices.
Innovation Solution
A two-port tunable or reconfigurable network with a hybrid coupler and internal two-port networks that can be adjusted in response to electrical signals or user controls to dynamically change the filter transfer function, allowing for multiple passbands or stopbands and integration with receivers or transceivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an array of switchable RF BPFs is used to support multiple frequency bands, then multi-band operation is enabled, but footprint, cost, and insertion loss increase
Solution Approach 1:
The patent implements a universal filter structure that can operate across multiple frequency bands by dynamically reconfiguring its characteristics. A single filter platform supports multiple standards and bands through electronic tuning mechanisms, eliminating the need for separate dedicated filters for each band. This multi-functional approach allows the same hardware to serve multiple purposes across different frequency ranges.
Solution Approach 2:
The filter employs dynamic reconfiguration capabilities through voltage-controlled oscillators and tunable resonators that can adjust their operating parameters in real-time. This dynamic adjustment allows the filter to adapt its center frequency, bandwidth, and other characteristics to match different communication standards and frequency bands, replacing static multi-filter arrays with a single adaptable filter.
2Adaptability or versatility
If an array of switchable RF BPFs is used to support multiple frequency bands, then multi-band operation is enabled, but cost and insertion loss increase
Solution Approach 1:
The patent implements a universal filter structure that can operate across multiple frequency bands by dynamically reconfiguring its characteristics. A single filter platform supports multiple standards and bands through electronic tuning mechanisms, eliminating the need for separate dedicated filters for each band. This multi-functional approach allows the same hardware to serve multiple purposes across different frequency ranges.
Solution Approach 2:
The patent converts the traditionally harmful effect of signal reflection into a useful mechanism for achieving multi-band operation. By utilizing reflection-type filtering where signals are reflected rather than transmitted through multiple switches, the system reduces insertion loss while maintaining the ability to select different frequency bands. The reflection mechanism inherently provides better impedance matching and lower loss compared to switched filter arrays.
3Reliability
If conventional fixed-characteristic filters are used, then filter performance is stable, but adaptability to multiple standards and changing environments is poor
Solution Approach 1:
The filter employs dynamic reconfiguration capabilities through voltage-controlled oscillators and tunable resonators that can adjust their operating parameters in real-time. This dynamic adjustment allows the filter to adapt its center frequency, bandwidth, and other characteristics to match different communication standards and frequency bands, replacing static multi-filter arrays with a single adaptable filter.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the electromagnetic environment and automatically adjust filter parameters to maintain optimal performance. The system detects changes in signal conditions, interference patterns, and environmental factors, then dynamically reconfigures the filter characteristics to compensate for these changes, ensuring both stability and adaptability simultaneously.
4Loss of energy
If a single-band RF BPF is used, then insertion loss is minimized, but it cannot support multiple disjoint frequency bands
Solution Approach 1:
The filter employs dynamic reconfiguration capabilities through voltage-controlled oscillators and tunable resonators that can adjust their operating parameters in real-time. This dynamic adjustment allows the filter to adapt its center frequency, bandwidth, and other characteristics to match different communication standards and frequency bands, replacing static multi-filter arrays with a single adaptable filter.
Solution Approach 2:
The patent replaces mechanical switching between multiple fixed filters with electronic tuning mechanisms. Instead of physically switching between different filter components, the system uses electronic control to dynamically adjust the resonant frequencies and characteristics of a single filter structure, achieving multi-band operation without the mechanical complexity and associated losses of switched filter arrays.
Data Source
AI summary
A two-port tunable or reconfigurable network having a filter transfer function may include: a network input port; a network output port; a hybrid coupler having a hybrid input port, a hybrid isolated port, a hybrid through port, and a hybrid coupled port; a first internal two-port network connected between the network input port and the hybrid input port; a second internal two-port network connected between the network output port and the hybrid isolated port; and a third internal two-port network connected between the hybrid through port and the hybrid coupled port. At least one of the first internal two-port network, the second internal two-port network, the third internal two-port network, and the hybrid coupler may be tunable or reconfigurable in response to an electrical signal or a user-operated control in a way that tunes or reconfigures the filter transfer function of the two-port tunable or reconfigurable network.A two-port tunable or reconfigurable network having a filter transfer function may include: a network input port; a network output port; a hybrid coupler having a hybrid input port, a hybrid isolated port, a hybrid through port, and a hybrid coupled port; a first load; a second load; a first internal two-port network connected between the between the first load and the hybrid through port; and a second internal two-port network connected between the between the second load and the hybrid coupled port. At least one of the first internal two-port network, the second internal two-port network, the hybrid coupler, the first load, and the second load may be tunable or reconfigurable in response to an electrical signal or a user-operated control in a way that tunes or reconfigures the filter transfer function of the two-port tunable or reconfigurable network.