High-frequency module antenna filter harmonic attenuation
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Solution Overview
Problem
Existing high-frequency modules with multiple communication signals require large sizes due to individual filters for each signal, leading to increased size and transmission loss, and difficulty in using one antenna for multiple signals effectively.
Innovation Solution
A high-frequency module with a switch IC and an antenna filter that attenuates higher harmonic frequency bands, functioning as a low-pass filter and matching circuit, allowing for a simplified configuration and reduced size by eliminating the need for individual-terminal filters, and incorporating an inductor for ESD protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual filters are provided for each communication signal, then signal quality is improved, but the size of the high-frequency module increases
Solution Approach 1:
The patent combines multiple individual filters into a single shared filter structure that serves multiple communication signals. The filter is positioned at the antenna interface and collectively attenuates harmonics for all signals, eliminating the need for separate filters at each terminal and thereby reducing the overall module size while maintaining signal quality.
Solution Approach 2:
The filter at the antenna interface serves multiple functions simultaneously: it acts as a low-pass filter for all communication signals, provides harmonic attenuation for multiple frequency bands, and serves as a matching circuit. This multi-functionality eliminates the need for separate individual-terminal filters, resolving the size contradiction.
2Reliability
If individual-terminal filters are provided close to individual terminals, then harmonic attenuation is improved, but transmission loss increases and size increases
Solution Approach 1:
The patent merges the harmonic attenuation function into a single filter located at the antenna interface rather than distributing filters close to each individual terminal. This consolidated approach reduces the total number of components and interconnections, thereby minimizing transmission loss while maintaining effective harmonic attenuation through the shared filter structure.
3Adaptability or versatility
If one antenna is used for multiple communication signals, then adaptability is improved, but signal interference increases without proper filtering
Solution Approach 1:
The patent implements a universal filter structure at the antenna interface that simultaneously handles multiple communication signals with different frequency bands. This single filter serves all signals by attenuating their respective harmonics, enabling one antenna to support multiple signals without interference while maintaining signal quality and adaptability.
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 a compact high-frequency module with reduced transmission loss and size, effectively attenuating higher harmonics, and providing impedance matching without additional components, while preventing second and third harmonics from entering the switch IC.
Implementation Method 1
an antenna filter, which functions as a low-pass filter, attenuates at least some of the higher harmonics of a plurality of transmission signals supplied to the antenna via the switch IC between the switch IC and the antenna
Implementation Method 2
by setting the values of the circuit components of the antenna filter, the antenna filter also preferably functions as a matching circuit between the antenna and the high-frequency module
Implementation Method 3
an electro-static discharge (ESD) protection circuit is provided for the high-frequency module and includes a portion that is disposed close to the antenna
Data Source
AI summary
A high-frequency module includes a switch IC. An antenna filter is connected to a common terminal of the switch IC and arranged adjacent to an antenna. The antenna filter is a low-pass filter whose attenuation band includes higher harmonic frequency bands of GSM1800/GSM1900 transmission signals and TDS-CDMA transmission signals. An individual-terminal filter is connected to one individual terminal of the switch IC. The individual-terminal filter is a low-pass filter whose attenuation band includes higher harmonic frequency bands of GSM850/GSM900 transmission signals.