RF Module Ground Wire Layout for Harmonic Interference Shielding
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Solution Overview
Problem
Radio-frequency modules used in multimode/multiband communication devices face performance degradation due to harmonic waves from low-band operation units interfering with mid-band units, leading to suboptimal communication performance.
Innovation Solution
A radio-frequency module design featuring a substrate with a conductor unit, a first communication unit for transmitting in a first frequency band, and a second communication unit for transmitting or receiving in a second frequency band overlapping with the harmonic wave, utilizing conductive wires spaced between these units to attenuate harmonic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radio-frequency module includes plural communication units for multimode/multiband operation, then communication versatility is improved, but harmonic waves from low-band units interfere with mid-band units, degrading communication performance
Solution Approach 1:
A ground wire is introduced as an intermediary element between the low-band communication unit and the mid-band communication unit. This ground wire acts as a shield to block harmonic waves generated by the low-band unit from interfering with the mid-band unit, thereby maintaining communication performance while supporting multimode/multiband operation
Solution Approach 2:
The invention converts the harmful harmonic waves into a beneficial shielding effect by using the ground wire. The ground wire utilizes the harmonic wave energy to create a reference potential that actively cancels or redirects the interference, transforming the harmful electromagnetic radiation into a protective shielding mechanism
2Area of stationary object
If communication units are disposed close together on the substrate, then device compactness is improved, but harmonic interference between units increases
Solution Approach 1:
The ground wire serves as a compact intermediary structure that fits within the limited space between communication units. By placing the ground wire in the available gaps rather than increasing overall device size, the invention achieves interference blocking without sacrificing device compactness
3Object-affected harmful factors
If a ground wire is disposed between communication units, then harmonic wave interference is reduced, but device complexity increases
Solution Approach 1:
The ground wire performs multiple functions simultaneously: it serves as an electrical ground reference for the communication units and as an electromagnetic shield against harmonic interference. This multi-functionality allows interference reduction without adding dedicated shielding structures, thereby minimizing the increase in device complexity
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 configuration effectively reduces harmonic wave interference, enhancing communication performance by preventing unwanted emissions and maintaining signal integrity across different frequency bands.
Implementation Method 1
The at least one conductive wire is spaced apart from the first communication unit and the second communication unit. The at least one conductive wire is located between the first power amplifier of the first communication unit, and the at least one of the transmitting filter, the receiving filter, or the low-noise amplifier of the second communication unit.
Data Source
AI summary
A substrate includes a conductor unit at constant potential. A first communication unit transmits a first signal in a first frequency band. A second communication unit performs at least one of transmission of a second signal in a second frequency band higher than the first frequency band and at least partially overlapping a harmonic of the first signal, or reception of a third signal in the second frequency band. First and second ends of a conductive wire are connected to the conductor unit. The second communication unit includes at least one of a transmitting filter that passes the second signal, a receiving filter that passes the third signal, or a low-noise amplifier that amplifies the third signal. The conductive wire is located between a first power amplifier of the first communication unit, and at least one of the transmitting filter, receiving filter, or low-noise amplifier of the second communication unit.