Loop Antenna Multi-Band Tuning via Switched Circuit Sub-Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication devices face challenges in accommodating multiple frequency bands within the limited space of internal antennas without increasing the antenna's size or structure, necessitating a solution that allows for efficient operation across various communication bands.
Innovation Solution
A communication device featuring a loop antenna with separate circuit element sub-groups, each comprising capacitive and inductive elements, which are selectively coupled to the antenna's feeding end via a selection circuit to achieve optimal impedance matching and enable operation across multiple communication bands, such as WWAN/LTE, without altering the antenna's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna size is increased to accommodate multiple frequency bands, then the antenna can operate in more communication bands, but the device size increases which is not acceptable for slim and small-size communication devices
Solution Approach 1:
The patent applies parameter changes by modifying the electrical characteristics (capacitance and inductance values) of the antenna circuit through switching between different circuit element sub-groups, rather than changing the physical dimensions of the antenna. This allows the same antenna structure to resonate at different frequencies corresponding to different communication bands, thereby achieving multi-band operation without increasing antenna size.
Solution Approach 2:
The patent implements dynamics by making the antenna's electrical parameters可调 (adjustable) through a switching mechanism that connects different circuit element sub-groups to the antenna element. This dynamic reconfiguration allows the antenna to adapt its resonant frequency to match different communication bands on demand, enabling versatile operation within a fixed physical footprint.
2Adaptability or versatility
If different antenna structures are designed for different frequency bands, then each band can be optimized, but the device complexity and space requirements increase
Solution Approach 1:
The patent applies universality by designing a single antenna element that can serve multiple frequency bands through the integration of switchable circuit element sub-groups. Instead of having separate antennas for different bands, one antenna structure performs multiple functions by switching its electrical characteristics, thereby reducing overall device complexity while maintaining multi-band capability.
Solution Approach 2:
The patent merges multiple circuit element sub-groups into a single antenna system, where each sub-group contains capacitive and inductive elements configured for specific frequency bands. By combining these sub-groups with the antenna element and a switching mechanism, the system achieves multi-band operation through a unified structure rather than separate antenna designs.
3Adaptability or versatility
If the antenna structure is changed to support multiple bands, then band coverage improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the circuit elements into separate sub-groups (capacitive elements and inductive elements) that can be independently manufactured and then assembled with the antenna element. This modular approach simplifies manufacturing compared to creating a single complex multi-band antenna structure, as each sub-group can be produced using standard electronic component fabrication processes.
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 allows the antenna to efficiently cover multiple communication bands by adjusting capacitances and inductances, ensuring optimal impedance matching and maintaining good antenna efficiency across different frequency bands, including GSM and LTE bands, within a compact design suitable for smartphones and tablets.
Implementation Method 1
different capacitances and inductances can correspond to multiple communication bands for optimal impedance matching
Implementation Method 2
the antenna element can operate in different communication bands, covering WWAN/LTE bands
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A communication device includes a ground element, an antenna element, a circuit element group, and a communication module. The antenna element is a loop antenna. One end of the antenna element is a grounding end coupled to the ground element, and the other end of the antenna element is a feeding end close to the grounding end. The circuit element group includes at least two separate circuit element sub-groups. The communication module is coupled to the circuit element group. One of the circuit element sub-groups of the circuit element group is selectively coupled to the feeding end so as to make the antenna element operate in different communication bands.