RF Multiplexer Branch Filtering With Leakage Cancellation
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Solution Overview
Problem
Radio frequency multiplexers used in wireless communications devices require a large number of filtering components to achieve sufficient isolation between different wireless operating bands, increasing complexity and size.
Innovation Solution
A radio frequency multiplexer design with M multiplexer branches, each equipped with a multi-bandpass filter to pass N/M bands, and a mirrored cancellation network to cancel signal leakage between branches, reducing the number of components needed while enhancing isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of filtering components are used to achieve sufficient isolation between different wireless operating bands, then isolation between bands is improved, but device complexity and size increase
Solution Approach 1:
The patent combines multiple filtering functions into a single integrated multiplexer structure that routes signals for multiple wireless operating bands through a unified architecture. The multiplexer integrates band selection and signal routing in one component, eliminating the need for separate filtering components for each band, thus reducing overall device complexity while maintaining isolation between bands.
Solution Approach 2:
The multiplexer is designed as a universal component that handles multiple wireless operating bands simultaneously through a single device. It performs both signal routing and filtering functions across N different bands, making the system more efficient by reducing the total number of components needed while preserving the required isolation between adjacent bands.
2Reliability
If a large number of filtering components are used to achieve sufficient isolation between different wireless operating bands, then isolation between bands is improved, but the size of the radio frequency front-end circuitry increases
Solution Approach 1:
The patent merges multiple filtering and routing functions into a single compact multiplexer structure, significantly reducing the physical footprint of the radio frequency front-end circuitry. By integrating what would traditionally require multiple separate filtering components into one unified device, the overall area occupied by the circuitry is minimized while maintaining the necessary isolation between wireless operating bands.
3Reliability
If multiple filtering components are used to route signals within different wireless operating bands, then signal isolation is improved, but the number of components and circuitry complexity increase
Solution Approach 1:
The multiplexer serves as a universal routing component that handles signal direction for multiple wireless operating bands within a single integrated circuit. It provides the necessary signal isolation between bands through its internal switching architecture, eliminating the need for complex interconnections between multiple separate filtering components, thus reducing overall circuitry complexity while maintaining signal isolation performance.
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 proposed design effectively increases isolation between wireless operating bands with a reduced number of filtering components, simplifying the radio frequency front-end circuitry and improving device performance.
Implementation Method 1
Each of the M number of multiplexer branches comprises a multi-bandpass filter configured to filter an N number of bands multiplexed by the radio frequency multiplexer to pass an individual group of N/M bands
Implementation Method 2
The mirrored cancellation network is configured to cancel undesirable signal leakage that may occur between the adjacent ones of the M number of multiplexer branches
Data Source
AI summary
Disclosed is a radio frequency multiplexer having an M number of multiplexer branches each having an outer port terminal coupled to a common outer node, wherein M is a positive counting number. Each of the M number of multiplexer branches comprises a multi-bandpass filter configured to filter an N number of bands multiplexed by the radio frequency multiplexer to pass an individual group of N/M bands, wherein N is a positive counting number greater than one and equal to a total number of bands to be multiplexed. Each of the M number of multiplexer branches further includes an N/M number of resonator branches each having a band port terminal configured to pass a single band and an inner branch terminal coupled to an inner port terminal of the multi-bandpass filter at a common inner node.