Reconfigurable Triplexer Filter Bank for Dead Zone Elimination
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Solution Overview
Problem
Traditional multiplexers have a fixed design, limiting their ability to handle multiple frequency bands efficiently, leading to dead zones and increased size, and struggle with balancing insertion loss and isolation between channels.
Innovation Solution
A reconfigurable multiplexer with a filter bank and bypass circuit that dynamically adjusts to support various frequency bands, reducing insertion loss and eliminating dead zones by using a combination of filters and load circuits, and a switching network to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed design multiplexer is used, then the device complexity is reduced, but the adaptability to handle multiple frequency bands deteriorates
Solution Approach 1:
The multiplexer employs dynamically switchable filter banks that can be reconfigured based on the required frequency bands. Switches enable or disable specific filter banks (first, second, third filter banks) depending on whether single-band or multi-band operation is needed, allowing the device to adapt its filtering capabilities without permanent complex interconnections for all possible bands.
Solution Approach 2:
The multiplexer design uses a universal structure where the same physical filter banks and switches can serve multiple frequency bands through different configuration states. The first filter bank handles lower bands, the second handles mid bands, and the third handles upper bands, with switches enabling these components to be activated or deactivated to match the required operating bands, making the device universally applicable across multiple scenarios.
2Adaptability or versatility
If traditional multiplexer design is used, then the device size is reduced, but dead zones in frequency coverage increase
Solution Approach 1:
The frequency coverage is segmented into different bands handled by separate filter banks. The first filter bank covers lower frequencies, the second covers mid frequencies, and the third covers upper frequencies. By segmenting the filtering function across multiple specialized banks with switches, the design eliminates dead zones between bands while keeping each filter bank compact, avoiding the need for a single large complex structure.
3Loss of energy
If fixed filter banks are used, then the manufacturing precision requirements are reduced, but the insertion loss performance deteriorates
Solution Approach 1:
The switch bank dynamically reconfigures which filter banks are active based on the operating frequency band. When operating in lower bands, only the first filter bank is enabled; when operating in mid bands, the second filter bank is enabled; and when operating in upper bands, the third filter bank is enabled. This dynamic activation ensures that signals always pass through the most appropriate filter with optimal characteristics, minimizing insertion loss for each band without requiring overly complex fixed configurations.
4Adaptability or versatility
If multiple filter banks are added to support more bands, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The multiple filter banks are segmented into distinct functional groups (first, second, third filter banks) each optimized for specific frequency ranges. The switch bank segments the control function by independently enabling or disabling each filter bank based on requirements. This segmentation allows multi-band support through modular activation rather than requiring all filters to be permanently interconnected, reducing overall system complexity.
Solution Approach 2:
Instead of activating all filter banks simultaneously (excessive action), the system activates only the necessary subset of filter banks required for the current operating band (partial action). The switch bank enables selective activation—using only one or two filter banks at a time depending on whether single-band or multi-band operation is needed—reducing the effective complexity while maintaining full adaptability.
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 reconfigurable multiplexer supports a wider range of frequency bands with lower insertion loss and reduced cross-channel interference, enabling more efficient carrier aggregation and improved performance across multiple frequency bands.
Implementation Method 1
a bypass circuit that includes at least one bypass path between the first filter bank and the switch bank enabling a signal to bypass the second filter bank
Implementation Method 2
A reconfigurable multiplexer with a filter bank and bypass circuit that dynamically adjusts to support various frequency bands
Data Source
AI summary
A reconfigurable triplexer that can support more frequency bands than a traditional triplexer is disclosed. For example, the reconfigurable triplexer can handle frequencies of several hundred megahertz up to 10 gigahertz. Further, certain implementations of the reconfigurable multiplexer can reduce or eliminate frequency dead zones that exist with traditional multiplexers. The reconfigurable triplexer includes a multi-stage filter bank capable of supporting a number of frequency bands and a bypass circuit that enables the triplexer to support a variety of sets of frequencies. For instance, unlike traditional triplexers, the reconfigurable triplexer can support both frequency bands with relatively narrow spacing and frequency bands with relatively wide spacing. Further, the inclusion of the bypass circuit enables the reduction or elimination of dead zones between supported frequencies.