Radio Frequency Module Common-Path Inductors for Multiband Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio frequency modules experience significant transmission loss across multiple bands due to inefficient signal propagation and impedance mismatching.
Innovation Solution
The radio frequency module incorporates a configuration with a common path shared by multiple signal paths, utilizing inductors with magnetic field coupling and strategically positioned filters and switches to optimize inductance values and reduce resistance loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inductors are arranged in separate signal paths for different frequency bands, then each band can have optimized inductance values, but transmission loss increases due to longer current paths and higher resistance
Solution Approach 1:
The patent merges the inductors from separate signal paths into a shared common path. The first inductor L1 is placed in the common path before the signal paths diverge, and the second inductor L2 is placed after they converge. This combining reduces the total number of inductors and shortens current paths, thereby reducing transmission loss while maintaining band-specific filtering through separate capacitors C1 and C2.
Solution Approach 2:
The common path with inductors L1 and L2 serves multiple frequency bands simultaneously. Instead of having separate inductors for each band, the shared inductors provide universal impedance matching and signal conditioning for both the first and second frequency bands, reducing overall device complexity while maintaining performance.
2Area of stationary object
If multiple separate inductors are used for different signal paths, then impedance matching can be optimized for each band, but module size increases
Solution Approach 1:
The patent combines multiple inductor functions into a shared common path structure. By placing inductors L1 and L2 in the common path that is shared by multiple signal paths, the module footprint is reduced compared to having separate inductors for each signal path, while still maintaining proper impedance matching through strategic placement and value selection.
3Loss of energy
If inductors are placed far apart in the circuit layout, then manufacturing is easier, but magnetic field coupling is insufficient leading to increased transmission loss
Solution Approach 1:
The patent applies local quality by creating a specific localized region of magnetic field coupling between inductors L1 and L2. By positioning these inductors close to each other in the common path, strong magnetic coupling is established in this local area, which improves signal transmission efficiency without requiring complex overall layout changes that would complicate manufacturing.
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
This design minimizes transmission loss across multiple bands by optimizing inductance values and reducing resistance in the signal paths, thereby enhancing signal integrity and module size efficiency.
Implementation Method 1
a first inductor that is connected to a common path connecting the first common terminal to the second common terminal; a second inductor that is connected to a first path connecting the third selection terminal to the first filter
Data Source
AI summary
A radio frequency module includes a first switch having a selection terminal connected to an antenna and a second selection terminal connected to an antenna and a first common terminal; a second switch having third and fourth selection terminals and a second common terminal; two filters; an inductor connected to a common path connecting the first and second common terminals; an inductor connected to a first path connecting the third selection terminal to the first filter; and an inductor connected to a second path connecting the fourth selection terminal to the filter. The distance between the first and second inductors is shorter than the distance between the first and third inductors.