Antenna Structure Multi-Band Impedance Matching
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Solution Overview
Problem
Existing antenna structures face challenges in miniaturization, leading to reduced space for multiple frequency bands, which affects impedance matching and radiation performance, and existing solutions are costly and do not meet the requirements of 5G communication technology.
Innovation Solution
An antenna structure with a substrate, first and second radiating elements, a signal transmission assembly including a signal transmission line, a first impedance matching circuit, a filter, and a feed-in element coupled between the signal transmission line and the grounding member, which allows for multi-band operation, reduced size, and improved radiation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna structure is miniaturized to reduce product space, then the device size is reduced, but the radiation performance and impedance matching deteriorate due to insufficient space for multiple frequency bands
Solution Approach 1:
The antenna structure is divided into multiple radiating elements (first radiating element, second radiating element, third radiating element) that operate at different frequency bands. Each radiating element is independently designed to resonate at specific frequency bands, allowing multi-band operation within a compact overall structure. The segmentation enables each element to maintain optimal electrical length for its designated frequency range despite the miniaturized form factor.
Solution Approach 2:
Multiple radiating elements are nested within the same spatial footprint by utilizing different layers and orientations. The first, second, and third radiating elements are arranged in a nested configuration where they occupy overlapping projected areas but operate in different three-dimensional spaces and frequency ranges. This nesting allows multiple frequency bands to coexist in a miniaturized volume without significant mutual interference.
2Adaptability or versatility
If multiple frequency bands are integrated in reduced space, then the multi-band capability is achieved, but the different frequency bands interfere with each other resulting in lower matching effect
Solution Approach 1:
Impedance matching circuits are introduced as intermediary components between the radiating elements and the feed-in element. These matching circuits (first impedance matching circuit, second impedance matching circuit) act as mediators that transform the impedance of each radiating element to match the characteristic impedance of the transmission line, thereby improving the matching effect across different frequency bands despite their close spatial proximity.
Solution Approach 2:
Different portions of the antenna structure are designed with locally optimized properties for specific frequency bands. Each radiating element has its own characteristic impedance and resonant frequency tailored to its designated band. The impedance matching circuits are locally configured with specific component values (inductors, capacitors) optimized for each frequency band, enabling independent impedance transformation without affecting other bands significantly.
3Reliability
If separate matching circuits are used for each frequency band, then the impedance adjustment is improved, but the overall cost increases
Solution Approach 1:
Multiple impedance matching circuits are merged into a single integrated network that serves multiple frequency bands simultaneously. Rather than using completely separate matching circuits for each band, the patent combines the matching functions into a unified structure where shared components (such as common grounding paths, overlapping transmission line sections, and integrated LC networks) perform impedance transformation for multiple bands. This merging reduces the total component count and overall complexity while maintaining effective impedance adjustment across all frequency bands.
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 antenna structure achieves a multi-band effect with a single feed-in element, reduces the overall area, and enhances radiation performance by using a signal transmission line, impedance matching circuit, and filter, while maintaining effective impedance matching across different frequency bands.
Implementation Method 1
a first radiating element disposed on the substrate, a second radiating element disposed on the substrate... The first radiating element and the second radiating element may have a first operating frequency band and a second operating frequency band, respectively
Implementation Method 2
a first impedance matching circuit and a filter, wherein the signal transmission line is coupled between the first radiating element and the second radiating element, and the first impedance matching circuit is coupling to the first radiating element and the signal transmission line
Data Source
AI summary
An antenna structure includes a substrate, a first radiating element, a second radiating element, a signal transmission assembly, a grounding member, and a feed-in element. The first radiating element is disposed on the substrate. The second radiating element is disposed on the substrate. The signal transmission assembly is disposed on the substrate. The signal transmission assembly includes a signal transmission line, a first impedance matching circuit, and a filter. The signal transmission assembly is coupled between the first radiating element and the second radiating element. The first impedance matching circuit is coupling to the first radiating element and the signal transmission line. The filter is coupling to the second radiating element and the signal transmission line. The feed-in element is coupled between the signal transmission line and the grounding member.