Multi-frequency Antenna Impedance Matching via Direct Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-frequency antennas, such as those for LTE, face challenges in achieving impedance matching without thickening the antenna structure, which is undesirable for compactness and lightness in electronic devices.
Innovation Solution
A multi-frequency antenna design featuring a substrate with a low-frequency radiation antenna and a high-frequency radiation antenna, where the coupling between components is optimized to achieve impedance matching without the need for a capacitor, utilizing a radiator connected to both antennas to cover multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor is used to connect the monopole antenna and the coupling component for impedance matching, then impedance matching is achieved, but the overall antenna structure becomes thicker
Solution Approach 1:
The invention extracts and eliminates the capacitor from the antenna structure. By using a direct coupling mechanism between the monopole antenna and the coupling component through the circuit board, the capacitor is removed entirely, achieving impedance matching without the additional thickness that a capacitor would introduce.
Solution Approach 2:
The invention merges the coupling function directly into the circuit board structure. The circuit board serves as both the substrate and the coupling medium, integrating the functions of mechanical support, electrical connection, and impedance matching into a single unified structure, thereby eliminating the need for separate capacitive components.
2Adaptability or versatility
If multiple components are used for multi-frequency operation, then frequency coverage is improved, but device complexity increases
Solution Approach 1:
The invention designs the antenna structure to serve multiple frequency bands through a single integrated configuration. The monopole antenna with its specific length and the coupling component working together enable the antenna to operate across low-band, mid-band, and high-band frequencies, making one structure perform multiple functions that would traditionally require separate antenna elements.
Solution Approach 2:
The invention segments the frequency bands into low-band, mid-band, and high-band operations, with each band achieved through specific dimensional parameters of the same antenna structure. By adjusting the length of the monopole antenna and the coupling component dimensions, different frequency ranges are achieved without adding separate antenna structures for each band.
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 design results in a thinner antenna structure that effectively matches impedance across various frequency bands, enhancing communication efficiency and compactness in portable electronic devices.
Implementation Method 1
The antenna portion is deposited on the substrate and located in one side of the substrate. The antenna portion includes a low-frequency radiation antenna and a high-frequency radiation antenna.
Data Source
AI summary
A multi-frequency antenna includes a substrate, an antenna portion and a radiator. The antenna portion has a low-frequency radiation antenna and a high-frequency radiation antenna. By selectively coupling the low-frequency radiation antenna, the high-frequency radiation antenna and the radiator, the multi-frequency antenna can work in multiple frequency bands.