Substrate-Integrated Antenna Module With Built-In 5-6 GHz Filtering
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Solution Overview
Problem
Existing Bluetooth and Wi-Fi modules are configured as independent modules, leading to issues of product miniaturization, redundancy, and system instability due to redundant components, and the need for a filter to block the 5-6 GHz band, which increases size and cost.
Innovation Solution
An antenna module with a built-in low-pass filter integrated into a substrate, using conductive and dielectric layers to form capacitors and inductors, eliminating the need for passive components, and connecting a Bluetooth antenna to a Wi-Fi module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent Bluetooth and Wi-Fi modules are used, then each module can function independently, but the product size increases and components are redundant
Solution Approach 1:
The patent combines Bluetooth and Wi-Fi modules into a single integrated module, sharing common components such as the antenna, RF front-end, and baseband processor. This merging approach maintains the functional independence of both communication protocols while significantly reducing the overall product size and eliminating component redundancy.
Solution Approach 2:
The integrated module employs universal components that serve multiple functions. For example, a single antenna structure supports both Bluetooth and Wi-Fi operations, and shared RF components handle both 2.4 GHz and 5 GHz bands, enabling one module to perform multiple communication functions simultaneously.
2Object-affected harmful factors
If a filter is added to block the 5-6 GHz band for Bluetooth antenna, then interference is reduced, but the circuit size increases and cost increases
Solution Approach 1:
The filter is integrated directly into the substrate where the Bluetooth antenna is formed, merging the filtering function with the antenna structure. This integration eliminates the need for separate discrete filter components, thereby reducing circuit size while maintaining the ability to block the 5-6 GHz band and prevent interference.
Solution Approach 2:
The filter is implemented as a planar pattern on the substrate rather than a three-dimensional component. By utilizing the two-dimensional plane of the substrate, the filter achieves frequency selectivity without adding vertical height or requiring additional space, thus reducing overall circuit footprint.
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 reduces the size and cost of the antenna module while effectively filtering the 5-6 GHz band, ensuring minimal insertion loss and enhancing system stability.
Implementation Method 1
the first pattern and the third pattern of the first conductive layer, the fourth pattern and the fifth pattern of the third conductive layer, and the first and second dielectric layer form first and second capacitors
Implementation Method 2
the second pattern, the sixth pattern, and the seventh pattern have a line shape and may form first to third inductors
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
An antenna module disclosed in an embodiment of the invention comprises: a substrate to which a first antenna is coupled; a low-pass filter portion embedded in a portion of the substrate; and a first transmission line connecting a first antenna and the low-pass filter portion, wherein the low-pass filter portion comprises a first conductive layer having first to third patterns, a second conductive layer having a ground pattern having first to third vias and a gap, a third conductive layer having a fourth pattern opposite the first pattern and a fifth pattern opposite the third pattern, a fourth conductive layer having sixth and seventh patterns in a line shape, and first to third dielectric layers between the first to fourth conductive layers. The first pattern and the third pattern of the first conductive layer, the fourth and fifth patterns of the third conductive layer, and the first and second dielectric layers form first and second capacitors, and the second, sixth, and seventh patterns have a line shape and may form first to third inductors.