Multi-band Antenna Impedance Matching via Inductive Conductor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-band antennas face challenges in achieving small size and efficient multi-band signal transmission while accommodating narrow border designs in communication devices, often resulting in impedance mismatch due to increased capacitive reactance.
Innovation Solution
A multi-band antenna design incorporating a ground portion, radiation portions, a feeding portion, and a matching portion, where the matching portion is connected to the radiation and ground portions to mitigate impedance mismatch using an inductive conductor or element, allowing for the generation of multiple resonant modes for efficient wireless transmission across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to accommodate narrow border designs, then the device appearance is improved, but impedance mismatch increases due to increased capacitive reactance
Solution Approach 1:
A matching portion is introduced as an intermediary element between the feeding portion and the first radiation portion. This matching portion includes an inductive conductor that provides inductive reactance to compensate for the capacitive reactance introduced by the reduced antenna size, thereby restoring proper impedance matching across multiple frequency bands
Solution Approach 2:
The patent modifies the electrical parameters of the antenna system by introducing an inductive conductor with specific inductance values. The inductive reactance parameter is adjusted to counterbalance the capacitive reactance, enabling the miniaturized antenna to maintain resonant operation at multiple frequency bands despite the reduced physical dimensions
2Adaptability or versatility
If the antenna is designed to transmit multi-band signals, then the communication functionality is improved, but the antenna complexity increases
Solution Approach 1:
The antenna is designed with a universal structure that can operate across multiple frequency bands (2.4 GHz, 5 GHz, and other bands) using a single radiation portion and ground portion configuration. The matching portion with inductive conductor provides universal impedance matching capability that works across different frequency bands without requiring separate antenna structures for each band
Solution Approach 2:
The antenna is segmented into distinct functional portions: a feeding portion, a matching portion with inductive conductor, a first radiation portion, and a second radiation portion. Each segment performs a specific function, allowing the overall system to achieve multi-band operation through coordinated operation of the segments rather than requiring a single complex structure
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 achieves better impedance matching and enables effective multi-band wireless transmission with a compact form factor, suitable for narrow-border devices, providing a good multi-band function with reduced height and improved performance across frequency bands like 2.4 GHz and 5 GHz.
Implementation Method 1
The feeding portion excites the first slot to generate a first resonant mode
Implementation Method 2
an inductive conductor or an inductive element is adopted to mitigate an influence of impedance mismatch
Data Source
AI summary
A multi-band antenna including a ground portion, a first radiation portion, a second radiation portion, a feeding portion and a matching portion is provided. The first radiation portion is disposed beside the ground portion, a first gap is existed between the ground portion and the first radiation portion so as to form a first slot, and the first slot has a first open terminal located at the first gap. The second radiation portion is connected to the first radiation portion. The feeding portion is located between the first radiation portion and the second radiation portion. The matching portion is located in the first slot and connected to the first radiation portion and the ground portion. The feeding portion excites the first slot to generate a first resonant mode. The second radiation portion generates a second resonant mode.