Reflection-Based RF Multiplexer Using Piezoelectric Resonators
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Solution Overview
Problem
Conventional RF filters and multiplexers face challenges in achieving compact, low-loss, and selective performance due to limitations in quality factor of components, particularly at higher frequencies, which complicates carrier aggregation and multi-standard communication requirements.
Innovation Solution
The use of high-Q resonators such as piezoelectric, SAW, BAW, and MEMS resonators, along with innovative architectures like quadrature hybrid couplers and tunable filters, to create reflection-based RF multiplexers that provide high isolation and selectivity across multiple frequency bands, reducing insertion loss and footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional passive RF filters and duplexers are used, then basic filtering function is achieved, but quality factor is limited and physical size becomes large
Solution Approach 1:
The patent replaces conventional mechanical/electromagnetic resonators with piezoelectric resonators that utilize piezoelectric effect to achieve high quality factors in a compact form. The piezoelectric material converts electrical energy to mechanical vibration and back, enabling superior Q-factor performance without increasing physical footprint.
Solution Approach 2:
The patent employs composite structures combining piezoelectric materials with electromagnetic resonator elements to achieve both high quality factor and compact size. The composite approach leverages the unique properties of piezoelectric materials to enhance the performance of traditional resonator designs.
2Manufacturing precision
If filter selectivity is increased to separate desired signal from interferers, then signal separation improves, but insertion loss increases
Solution Approach 1:
The patent replaces conventional electromagnetic resonators with piezoelectric resonators that offer higher quality factors, enabling sharper filter selectivity with lower insertion loss. The piezoelectric effect allows for more efficient energy storage and release, reducing energy loss while maintaining high selectivity.
Solution Approach 2:
The patent changes the fundamental operating parameters of the resonator by using piezoelectric materials with superior Q-factor characteristics. This parameter change enables the filter to achieve the same selectivity with lower insertion loss or higher selectivity with the same insertion loss compared to conventional designs.
3Adaptability or versatility
If multiple frequency bands are supported for carrier aggregation, then communication capability improves, but device complexity and footprint increase
Solution Approach 1:
The patent designs a universal piezoelectric resonator platform that can be tuned to support multiple frequency bands through a single device architecture. The piezoelectric resonator can be electrically reconfigured or mechanically adjusted to operate across different bands, eliminating the need for separate resonators for each frequency band.
Solution Approach 2:
The patent introduces dynamic reconfigurability to the resonator system, allowing the piezoelectric resonator to change its operating frequency band on-demand. This dynamic capability enables a single resonator to replace multiple fixed-frequency resonators, reducing device complexity while maintaining multi-band support.
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 realization of compact, low-loss, and highly selective RF multiplexers with improved port-to-port isolation, supporting multi-standard and carrier aggregation capabilities while reducing component costs and complexity.
Implementation Method 1
The use of high-Q resonators such as piezoelectric, SAW, BAW, and MEMS resonators
Implementation Method 2
The use of high-Q resonators such as piezoelectric, SAW, BAW, and MEMS resonators
Implementation Method 3
The use of high-Q resonators such as piezoelectric, SAW, BAW, and MEMS resonators
Implementation Method 4
innovative architectures like quadrature hybrid couplers
Data Source
AI summary
A radio frequency multiplexer, which supports a plurality of frequency bands, comprises a common node, a plurality of single band nodes, and a plurality of parallel branches. Each of the plurality of parallel branches is designated to one of the plurality of frequency bands and connects the common node and one of the plurality of single band nodes. A particular branch of the parallel branches may comprises a filter for a desired frequency band that passes through the particular branch, a quadrature hybrid coupler coupled to the filter, and a set of one or more other filters for one or more other frequency bands in the plurality of frequency bands respectively. The set of one or more other filters is coupled to the quadrature hybrid coupler for rejecting the one or more other frequency bands by the particular branch.