RF Circuit Multiplexer with Wideband Filter for 5G WLAN
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Solution Overview
Problem
Existing radio frequency circuit configurations, such as those disclosed in U.S. Pat. No. 10,257,119, do not support the simultaneous transfer of radio frequency signals from unlicensed bands higher than or equal to 6 GHz alongside signals from frequency bands under 5 GHz.
Innovation Solution
A radio frequency circuit design that includes a first transfer circuit for signals between 3.3 GHz and 5 GHz, a second transfer circuit for signals from 6.6 GHz and above, and a wideband filter with a passband covering both frequency ranges, allowing for the simultaneous transfer of signals with low loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional front end configuration is used, then signals in frequency bands under 5 GHz can be transferred, but signals in unlicensed bands higher than or equal to 6 GHz cannot be transferred simultaneously
Solution Approach 1:
The first filter is designed with a wide passband that covers both the first frequency band (3.3-5 GHz) and the second frequency band (6.6 GHz and above), allowing a single filter component to handle multiple frequency ranges simultaneously. This multi-functional approach enables the radio frequency circuit to transfer signals from both unlicensed bands above 6 GHz and bands under 5 GHz through a unified filtering path, resolving the contradiction between frequency band coverage and circuit complexity
2Measurement precision
If separate transfer circuits are used for different frequency bands, then frequency selectivity is improved, but signal isolation between bands deteriorates
Solution Approach 1:
The first filter acts as an intermediary component positioned between the input/output terminal and the connection node where the first and second transfer circuits meet. This filter mediates the interaction between the two frequency bands by providing frequency-selective passing characteristics, allowing signals from both bands to coexist in the same circuit without mutual interference. The filter's wide passband design ensures that it selectively passes desired frequencies while maintaining signal isolation between the 3.3-5 GHz band and the 6.6 GHz+ band
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
Enables the efficient transfer of radio frequency signals from both unlicensed bands above 6 GHz and bands under 5 GHz, improving signal isolation and reducing insertion loss, thereby supporting advanced communication systems like 5G and WLAN.
Implementation Method 1
a first filter having, as a passband, a frequency band including the first frequency band and the second frequency band
Data Source
AI summary
A radio frequency circuit includes: an antenna connection terminal; a UHB transfer circuit that transfers a signal of a first frequency band including at least a part of a frequency band higher than or equal to 3.3 GHz and under 5 GHz; a NR-U transfer circuit that transfers a signal of a second frequency band including at least a part of a frequency band higher than or equal to 6.6 GHz; and a filter having a frequency band including the first frequency band and the second frequency band as a passband. The filter is disposed between the antenna connection terminal and a connection node of the UHB transfer circuit and the NR-U transfer circuit.