Circularly Polarized Patch Antenna Volume Reduction
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Solution Overview
Problem
Existing circularly polarized patch antennas face challenges in reducing size and volume while maintaining resonant frequency, as reducing the radiation metal piece area leads to increased resonant frequency, making it difficult to integrate them into compact portable devices like PDAs and mobile phones without compromising signal reception.
Innovation Solution
Incorporating frequency down-conversion metal pieces on the side face of the substrate, which can be adjusted in position and area to maintain the original resonant frequency, reducing the antenna's volume by 10% to 50% without exceeding half the substrate's side face area, thereby allowing integration into compact devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the substrate volume is reduced to fit compact devices, then the antenna can be mounted in small-volume PDAs or mobile phones, but the resonant frequency rises and departs from the GPS receive band
Solution Approach 1:
The patent introduces frequency down-conversion metal pieces positioned on the side faces of the substrate, utilizing the vertical/dimensional space rather than expanding the planar area. This allows the antenna to maintain its resonant frequency within the GPS band even when the substrate volume is reduced, as the side-face metal pieces provide the necessary capacitive loading to compensate for the smaller radiation area.
Solution Approach 2:
The patent modifies the electrical parameters of the antenna by adding frequency down-conversion metal pieces that alter the resonant frequency characteristics. By adjusting the position, area, and configuration of these metal pieces on the side faces, the resonant frequency can be tuned to remain within the GPS receive band despite the reduced substrate volume.
2Area of stationary object
If the radiation metal piece area is reduced to decrease antenna volume, then the antenna size is reduced, but the resonant frequency increases and GPS signal reception is lost
Solution Approach 1:
Instead of relying solely on the planar area of the radiation metal piece, the patent extends the electromagnetic interaction into the vertical dimension by adding frequency down-conversion metal pieces on the side faces of the substrate. This dimensional extension allows the antenna to maintain its resonant frequency with a smaller radiation area, as the side-face metal pieces provide additional capacitive effect to compensate for the reduced planar dimensions.
3Reliability
If frequency down-conversion metal pieces are added to reduce resonant frequency, then the original resonant frequency is maintained in compact antennas, but the device complexity increases
Solution Approach 1:
The frequency down-conversion metal pieces on the side faces serve multiple functions: they provide capacitive loading to maintain the resonant frequency, they enable miniaturization of the substrate, and they can be configured in various patterns to achieve different frequency adjustments. This multi-functionality reduces the need for separate tuning components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent applies frequency down-conversion metal pieces selectively at specific locations on the side faces of the substrate, rather than uniformly across the entire structure. By localizing these metal pieces at strategic positions, the design achieves the necessary frequency adjustment with minimal additional complexity, as only specific regions require the enhanced 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 solution effectively reduces the antenna's volume while maintaining its resonant frequency and circularly polarized properties, enabling successful signal reception and transmission in compact portable electronic devices.
Implementation Method 1
The resonant frequency of the circularly polarized patch antenna is 1575.42MHz... When the resonant frequency of the antenna is to be reduced, the position and the area of the frequency down-conversion metal piece can be adjusted
Implementation Method 2
a plurality of frequency down-conversion metal pieces extends from the grounded metal piece... adhered on the side face of the substrate... arranged diagonally with respect to the frequency down-conversion metal piece on the opposite side face
Data Source
AI summary
A circularly polarized patch antenna assembly having a relatively compact volume includes a substrate, a radiation metal piece, a grounded metal piece and a signal-inputting body. A plurality of metal pieces in a form of elongate stripe extends from four sides of the grounded metal piece, thereby to reduce the resonant frequency. The metal pieces are adhered on the side face of the substrate, so that the metal piece on one side face is arranged diagonally with respect to the metal piece on the opposite side face. When the resonant frequency of the antenna is to be reduced, the position and the area of the metal piece can be adjusted but the increased area of the metal piece cannot be larger than a half area of the side face of the substrate. Alternatively, the length of the metal piece can be increased.