Antenna Module RSE Suppression via Harmonic Control Switch
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Solution Overview
Problem
Existing antenna technologies face challenges in reducing Radiated Spurious Emission (RSE) without compromising transmission power, as high order harmonics generated by antennas exceed standard limits, affecting communication performance.
Innovation Solution
Incorporating a Radiated Spurious Emission (RSE) improvement component, such as a radio frequency switch or filter circuit, into the antenna module to suppress high order harmonics by controlling the working state of these components when the antenna operates in a target frequency band, thereby preventing harmonic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If transmission power of the antenna is reduced to satisfy RSE test requirements, then spurious emission is reduced, but communication performance deteriorates
Solution Approach 1:
The antenna system is segmented into multiple radiation arms, each capable of operating at different frequency bands. The first radiation arm operates at the target frequency band while the second radiation arm is designed to suppress harmonic radiation. This segmentation allows the system to maintain high transmission power at the target frequency while reducing spurious emissions through the dedicated harmonic suppression function of the second arm.
Solution Approach 2:
A coupling component is introduced as an intermediary between the feed source and the radiation arms. This coupling component enables independent impedance matching and power control for each radiation arm, allowing the system to optimize transmission power at the target frequency while separately controlling harmonic suppression without compromising overall communication performance.
2Object-generated harmful factors
If transmission power is reduced to meet emission standards, then RSE compliance is improved, but communication performance deteriorates
Solution Approach 1:
The antenna is divided into functionally independent radiation arms where the first arm handles target frequency transmission and the second arm handles harmonic suppression. This functional segmentation enables the system to meet RSE compliance requirements while maintaining robust communication performance through the primary radiation arm.
Solution Approach 2:
The impedance parameters of the radiation arms are optimized independently. The first radiation arm is impedance-matched for maximum power transfer at the target frequency, while the second radiation arm is designed with specific impedance characteristics to suppress harmonic radiation. This parameter optimization ensures both RSE compliance and communication reliability.
3Object-generated harmful factors
If high order harmonics are suppressed using traditional methods, then RSE is reduced, but device complexity increases
Solution Approach 1:
Instead of adding complex external filtering components, the antenna structure itself is segmented into multiple radiation arms with different functional characteristics. The second radiation arm is designed with specific geometric parameters that inherently suppress high order harmonics, achieving harmonic reduction without increasing overall device complexity.
Solution Approach 2:
The second radiation arm serves multiple functions: it acts as a parasitic element for the first radiation arm to enhance target frequency radiation, and simultaneously functions as a harmonic suppression element through its specific design. This multi-functionality reduces the need for additional dedicated harmonic filtering components.
Data Source
AI summary
An antenna module for a terminal includes an antenna and a Radiated Spurious Emission (RSE) improvement component. The antenna includes a feed source, a ground point, and at least one radiation arm. The RSE improvement component is coupled to the antenna for suppressing high order harmonics generated by the antenna when the antenna operates in a target frequency band, and includes a radio frequency switch having a terminal connected to the at least one target radiation arm, and another terminal connected to the ground point; or, the radio frequency switch is connected in series into the at least one target radiation arm of the antenna. The at least one target radiation arm is a radiation arm by which the antenna radiates the high order harmonics outward.