Reconfigurable Multiplexer With Bypass Paths for RF Dead Zones
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Solution Overview
Problem
Traditional multiplexers have a fixed design, limiting their ability to handle multiple frequency bands efficiently, resulting in dead zones and increased size, and struggle to balance insertion loss and isolation between channels.
Innovation Solution
A reconfigurable multiplexer with a filter bank and bypass circuit that dynamically adjusts to support multiple frequency bands by selecting appropriate filters and load circuits based on control signals, reducing insertion loss and eliminating dead zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed design multiplexer is used, then the structure is simple, but it cannot efficiently handle multiple frequency bands and creates dead zones
Solution Approach 1:
The multiplexer employs dynamic switching mechanisms that allow it to reconfigure its internal connections based on the frequency band being used. Switches can dynamically connect different filter banks and bypass paths, enabling the same physical structure to adapt to multiple frequency bands (e.g., narrowband and wideband) without requiring separate fixed designs for each band.
Solution Approach 2:
The multiplexer is designed with universal components that can serve multiple functions across different frequency bands. The filter bank includes both narrowband and wideband filters that can be selectively activated, and the bypass circuit can serve as either a direct signal path or be engaged with filters depending on the operational mode, making the device universally applicable to various communication standards.
2Volume of stationary object
If traditional multiplexer design is used, then the insertion loss and isolation are balanced, but it increases the device size and creates dead zones
Solution Approach 1:
The multiplexer is segmented into distinct functional modules including multiple filter banks (narrowband and wideband), bypass circuits, and switching networks. This segmentation allows only the necessary components to be activated for each frequency band, reducing the effective size in use and eliminating dead zones where no signal path exists. For example, when operating in wideband mode, only the wideband filter bank and bypass circuit are engaged.
Solution Approach 2:
The bypass circuit acts as an intermediary element that provides a direct signal path when filters are not needed, eliminating dead zones and reducing insertion loss. The switching network serves as another intermediary that intelligently routes signals through appropriate paths, ensuring continuous signal transmission quality across all frequency bands without requiring the device to be oversized to accommodate all possible paths simultaneously.
3Adaptability or versatility
If multiple frequency bands are supported, then the versatility increases, but the insertion loss and cross-channel interference increase
Solution Approach 1:
Different parts of the multiplexer are optimized for specific frequency ranges with appropriate filter characteristics. The narrowband filter bank uses filters optimized for narrowband frequencies, while the wideband filter bank uses filters optimized for wideband frequencies. This local optimization ensures minimal insertion loss for each frequency band by using filters specifically designed for their intended operating range rather than using a single generic filter design for all bands.
Data Source
AI summary
A reconfigurable multiplexer that can support more frequency bands than a traditional multiplexer is disclosed. For example, the reconfigurable multiplexer 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 multiplexer includes a filter bank capable of supporting a number of frequency bands and a bypass circuit that enables the multiplexer to support a variety of sets of frequencies. For instance, unlike traditional multiplexers, the reconfigurable multiplexer 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.