Filtering Antenna Coupling Structure for Impedance Matching
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting multiple frequencies and standards with compact, low-loss antennas that integrate radiation and filtering functions.
Innovation Solution
A filtering antenna design featuring a ground layer, dielectric layers, and a radiating patch with a coupling probe, including a microstrip line and feeder, optimized for impedance matching and resonance modes to achieve radiation and filtering functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna-filter fusion design is implemented, then the structure becomes more compact and loss is reduced, but the impedance matching becomes more difficult to optimize
Solution Approach 1:
The patent employs parameter optimization by systematically adjusting the ratio D1/D4 (distance from feed center to trunk line end relative to distance from trunk line end to radiating patch edge) within the range of 2.5-3.0. This parameter change enables simultaneous achievement of compact structure and optimal impedance matching, resolving the technical contradiction between compactness and matching precision.
2Adaptability or versatility
If multiple frequencies and standards are supported, then the system becomes more versatile, but the antenna design complexity increases
Solution Approach 1:
The patent implements a universal antenna design where the radiating patch and microstrip line structure serve multiple functions: radiation, filtering, and impedance matching across different frequency bands. The optimized D1/D4 ratio enables the same structure to achieve good performance in multiple frequency standards without requiring additional matching circuits, thus supporting versatility while controlling design complexity.
3Reliability
If filter circuits and matching circuits are added to achieve filtering function, then the filtering performance is improved, but the structure becomes more complex and loss increases
Solution Approach 1:
The patent merges the filtering function directly into the radiating patch structure itself, eliminating the need for separate filter circuits and matching circuits. The radiating patch is designed with specific dimensions and the microstrip line is optimized with the D1/D4 ratio to inherently provide filtering characteristics while maintaining radiation function, thus achieving filtering performance without additional circuit complexity.
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, wide bandwidth, and reduced inter-frequency coupling, with compact structure and low manufacturing costs, suitable for 5G applications.
Implementation Method 1
a coupling probe, including a microstrip line sandwiched between the first dielectric layer and the second dielectric layer, and including a feeder that penetrates the first dielectric layer
Implementation Method 2
optimized for impedance matching and resonance modes to achieve radiation and filtering functions
Implementation Method 3
The filtering antenna includes a ground layer, a first dielectric layer, a second dielectric layer and a radiating patch that are stacked in sequence
Implementation Method 4
optimized for impedance matching and resonance modes to achieve radiation and filtering functions
Data Source
AI summary
The present disclosure provides a filtering antenna. The filtering antenna includes: a ground layer, a first dielectric layer, a second dielectric layer and a radiating patch and a coupling probe. The coupling probe includes a microstrip line sandwiched between the first and second dielectric layers, and includes a feeder that penetrates the first dielectric layer. The microstrip line includes a trunk line and an open-circuit branch line connected to the trunk line. A distance between a feed center of the microstrip line and a first end of the trunk line is D1, and a distance between an orthographic projection of the first end of the trunk line on the second dielectric layer and an orthographic projection of an edge of the radiating patch on the second dielectric layer is D4, where 2.5≤D1/D4≤3.0.