Stacked Patch Antenna Layout for Wideband Feed Isolation
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Solution Overview
Problem
Existing patch antennas have limited operating frequency bands and require improvements for better integration and performance, particularly in low-earth orbit satellite communication systems.
Innovation Solution
The patch antenna design incorporates multiple substrates to separate the driving and parasitic radiative elements, allowing for broader frequency operation from 17.7 GHz to 20.2 GHz, and employs a parasitic resonator to suppress interference between feed-in lines, enhancing signal transmission and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple substrates are used to separate driving and parasitic radiative elements, then the operating frequency band is broadened, but the device complexity increases
Solution Approach 1:
The antenna is divided into multiple substrates: a first substrate for the driving radiative element and a second substrate for the parasitic radiative element. This segmentation allows independent optimization of each element's frequency response, enabling broader operating bandwidth while maintaining manageable complexity through modular design
Solution Approach 2:
The patent transitions from a planar single-substrate design to a three-dimensional stacked multi-substrate configuration. By utilizing the vertical dimension (stacking substrates), the design achieves frequency band broadening without significantly increasing the horizontal footprint, thus managing device complexity
2Reliability
If parasitic resonator is added to suppress interference between feed-in lines, then signal isolation is improved, but device complexity increases
Solution Approach 1:
A parasitic resonator is introduced as an intermediary element between the feed-in lines. This resonator couples to both feed lines and creates destructive interference for unwanted signals, thereby improving isolation between ports. The resonator acts as a mediator that suppresses interference without requiring complete physical separation of the feed lines
Solution Approach 2:
The parasitic resonator is designed with specific electrical parameters (resonant frequency, quality factor, coupling coefficients) that are optimized to suppress interference at the operating frequencies. By carefully controlling these parameters, effective signal isolation is achieved with a single additional element rather than complex filtering networks
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 a 2.5 GHz bandwidth with improved signal transmission and isolation, suitable for low-earth orbit satellite communication, while maintaining circular polarization without significant scattering parameter degradation.
Implementation Method 1
employs a parasitic resonator to suppress interference between feed-in lines
Implementation Method 2
The patch antenna includes a first substrate, a first adhesive layer, a second substrate... a driving radiative element, a parasitic radiative element, a parasitic resonator
Implementation Method 3
The radiating metal arm 91 is disposed on the first surface... The U-shaped slot 92 and the parasitic metal arms 94 are capable of broadening an operating frequency band of the patch antenna
Data Source
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AI summary
A patch antenna includes a first substrate (11), a second substrate (12) and a substrate module (120) stacked from top to bottom, a driving radiative element (41) disposed below the second substrate (12), and a parasitic radiative element (42) disposed above the first substrate (11). The patch antenna further includes a first feed-in line (521) and a second feed-in line (522) disposed below the substrate module (120). The patch antenna further includes a first feed-out probe (511) and a second feed-out probe (512), each extends from below the driving radiative element (41) and penetrates the substrate module (120). When the driving radiative element (41) receives an electromagnetic wave, a portion of the electromagnetic wave is coupled to the first feed-out probe (511) and the first feed-in line (521), and another portion of the electromagnetic wave is coupled to the second feed-out probe (512) and the second feed-in line (522).