Polyhedral Chip Antenna for FM and Bluetooth Reception
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Solution Overview
Problem
Current mobile communication terminals face challenges in implementing a small-sized internal antenna capable of receiving FM and Bluetooth signals due to the large physical size required for FM radio antennas and the interference issues with Bluetooth functionality, leading to poor FM radio reception efficiency and increased manufacturing costs.
Innovation Solution
An internal antenna module comprising a polyhedral chip antenna with a winding radiant pattern and a coupling pattern, mounted on a flexible circuit board, which is electrically connected to both FM and Bluetooth signal processing modules, allowing simultaneous reception of FM and Bluetooth signals without the need for separate antennas, and includes a filter unit and LNA for signal amplification and interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional long radiation line antenna is used for FM radio reception, then FM reception quality is improved, but the antenna size becomes too large for modern slim terminals
Solution Approach 1:
The patent embeds the FM antenna within the Bluetooth antenna structure. The FM antenna is positioned inside the Bluetooth antenna housing, utilizing the same spatial envelope. This nested configuration allows the FM antenna to achieve its required effective length for low-frequency reception without increasing the overall terminal dimensions, as both antennas share the same physical space.
Solution Approach 2:
The patent transitions from a planar two-dimensional antenna layout to a three-dimensional stacked configuration. By arranging the FM and Bluetooth antennas in different vertical layers (z-dimension) rather than side-by-side in the same plane, the design achieves sufficient separation for independent operation while maintaining a compact footprint. The FM antenna is positioned in a lower layer while the Bluetooth antenna occupies the upper layer.
2Reliability
If separate FM and Bluetooth antennas are installed, then reception quality for both functions is improved, but the device complexity and spatial burden increase
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated antenna module. The FM antenna and Bluetooth antenna are housed together in one structural unit with shared components such as the antenna holder and mounting structure. This merging approach maintains distinct functional zones for each antenna type while eliminating redundant structural elements that would otherwise be required for separate antenna installations.
Solution Approach 2:
The antenna module is designed as a multi-functional unit that simultaneously supports both FM radio reception and Bluetooth communication. The shared housing and mounting structure serve both antenna types, creating a universal platform that handles multiple wireless functions. This multi-functionality reduces the overall component count and simplifies the integration process compared to implementing separate dedicated antenna modules for each function.
3Volume of moving object
If dielectric materials with high dielectric constant are used to reduce antenna size, then antenna compactness is improved, but manufacturing cost increases and frequency bandwidth is narrowed
Solution Approach 1:
The patent achieves antenna size reduction through geometric parameter optimization rather than relying on high-dielectric materials. The FM antenna employs a folded or meandered radiation pattern that increases the effective electrical length within a reduced physical footprint. By carefully controlling the trace width, spacing, and folding geometry of the antenna conductor, the design achieves resonant frequencies in the FM band while maintaining a compact form factor using standard dielectric substrates.
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 small-sized, slim mobile communication terminal with high FM radio reception quality and reduced spatial burden, maintaining constant Bluetooth reception quality without additional components, such as earphones, and eliminates the need for separate Bluetooth antennas.
Implementation Method 1
a polyhedral chip antenna configured to include a polyhedral block, a first radiant pattern configured in a winding form along the external faces of the polyhedral block
Implementation Method 2
the internal antenna module may further include a filter unit for removing a high frequency component from the reception signal
Implementation Method 3
an LNA for amplifying the reception signal from which the high frequency component has been removed by the filter unit
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
Disclosed herein is an internal antenna module that is installed in a terminal and that can receive signals in both the FM and Bluetooth frequency bands so as to achieve a small-sized, slim terminal. The internal antenna module includes a polyhedral chip antenna configured to have a first radiant pattern and a coupling pattern formed thereon, a flexible circuit board configured to have a first conductive pad connected to the first radiant pattern, a second conductive pad connected to a coupling pattern, and a second radiant pattern connected to the first radiant pattern, and a signal switching unit formed between the second conductive pad and a ground, and configured to prevent any one of a first frequency band signal and a second frequency band signal, received through the chip antenna and the flexible circuit board, from reaching the ground.