RF Multiplexer Inductor Layout for Band 3 and Band 32 Attenuation
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Solution Overview
Problem
Existing multiplexers face insufficient attenuation in Band 3 and Band 32 reception bands during transmission in Band 1, which affects simultaneous communication operations.
Innovation Solution
A multiplexer design incorporating a common terminal, ladder filters, and inductors connected in series with parallel arm resonators, allowing specific communication bands to pass through while achieving attenuation in other bands through identical winding direction inductors, ensuring effective carrier aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first filter is designed to allow a first communication signal of a first communication band to pass therethrough, then the first communication signal transmission is enabled, but insufficient attenuation occurs in a second communication band and a third communication band
Solution Approach 1:
The first filter is segmented into multiple parallel arm resonators, each responsible for attenuating specific frequency bands. By dividing the attenuation function across multiple resonators with different resonant frequencies, the filter achieves comprehensive attenuation in Band 3 and Band 32 while maintaining Band 1 transmission, resolving the contradiction between attenuation performance and structural complexity.
Solution Approach 2:
Each parallel arm resonator is designed with specific local quality characteristics (different resonant frequencies) to target specific communication bands. The second parallel arm resonator is tuned to attenuate Band 3 while the third parallel arm resonator is tuned to attenuate Band 32, allowing the filter to achieve frequency-selective attenuation without requiring a completely different filter structure for each band.
2Reliability
If inductors are added in series with parallel arm resonators to improve attenuation, then attenuation performance in Band 3 and Band 32 is enhanced, but the device complexity increases
Solution Approach 1:
The inductors are merged with the existing parallel arm resonators to form integrated resonant circuits. By combining the inductor elements with the resonator structures, the patent achieves enhanced attenuation functionality without adding completely separate components, thus improving attenuation performance while minimizing the increase in device complexity.
Solution Approach 2:
The inductors are designed with specific inductance values and identical winding directions to optimize the resonant frequencies of the parallel arm resonators. By carefully selecting and adjusting the inductor parameters, the filter achieves the required attenuation characteristics in Band 3 and Band 32, resolving the contradiction between performance enhancement and complexity increase.
3Reliability
If multiple filters are used to achieve attenuation in different communication bands, then attenuation performance is improved, but the device complexity and size increase
Solution Approach 1:
The first filter is designed with multi-functionality to simultaneously perform transmission of Band 1 signals and attenuation of both Band 3 and Band 32 signals. By integrating multiple attenuation functions into a single filter structure with multiple parallel arm resonators, the patent eliminates the need for separate filters for each band, thereby improving multi-band attenuation capability while reducing device complexity and size.
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 solution enables sufficient attenuation in Band 3 and Band 32 reception bands during Band 1 transmission, enhancing the multiplexer's ability to handle simultaneous communication operations and carrier aggregation.
Implementation Method 1
The first inductor and the second inductor have identical winding directions from a first filter side to a ground side thereof
Implementation Method 2
The first inductor is connected in series with one parallel arm resonator... between the one parallel arm resonator and ground. The second inductor is connected in series with another parallel arm resonator... between the other parallel arm resonator and ground
Data Source
AI summary
Provided is a multiplexer that includes a first filter (first transmission filter), a second filter (second reception filter), a third filter (third reception filter), a first inductor, and a second inductor. The first inductor is connected in series with one parallel arm resonator (second parallel arm resonator) of the first filter between the one parallel arm resonator and ground. The second inductor is connected in series with another parallel arm resonator (third parallel arm resonator) of the first filter between the other parallel arm resonator and ground. The first inductor and the second inductor have the same winding direction as each other from the first filter side toward the ground side thereof.