Single Feed Multi-Frequency Antenna With Inductive Patch Coupling
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Solution Overview
Problem
Existing single-feed multi-frequency multi-polarization antennas are difficult to manufacture and tune accurately, and cannot independently tune the two frequency bands.
Innovation Solution
The antenna employs inductive coupling between coplanar inner and outer patches using relatively long, thin traces that function as inductors, allowing for enhanced manufacturability and performance by preventing signal coupling between the patches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If coplanar inner and outer patches are used with direct connection, then manufacturing is simpler, but manufacturing precision deteriorates due to inconsistent gaps between elements
Solution Approach 1:
The patent introduces an intermediary inductive coupling mechanism between the inner and outer patches. This coupling allows the patches to be connected through magnetic field interaction rather than direct physical contact, enabling consistent manufacturing while maintaining the desired gap between elements for proper antenna function.
2Device complexity
If coplanar inner and outer patches are used with direct connection, then device structure is simpler, but frequency band tuning independence deteriorates
Solution Approach 1:
The patent segments the antenna into distinct inner and outer patch elements with separate resonant frequencies. The inductive coupling allows each patch to be tuned independently to different frequency bands while maintaining a unified coplanar structure, enabling multi-frequency operation without increasing overall device complexity.
3Ease of manufacture
If screen printing process is used for antenna elements, then manufacturing cost is lower, but manufacturing precision deteriorates due to inability to produce accurate gaps
Solution Approach 1:
The patent replaces the mechanical direct-connection approach with an inductive coupling system. This substitution allows the use of cost-effective screen printing processes while achieving the required gap precision through electromagnetic field interaction rather than relying on mechanical alignment of printed elements.
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 simplifies the manufacturing process and enhances performance by allowing independent tuning of frequency bands, resulting in improved accuracy and efficiency in receiving multiple signals with different frequencies and polarizations.
Implementation Method 1
The inner and outer patches are connected to each other by a plurality of relatively long, relatively thin traces. Each trace functions as an inductor. The individual traces or inductors are resonant and in parallel. The inductors couple the outer patch signals to the outer patch and prevent the inner patch signals from coupling to the outer patch.
Data Source
AI summary
An antenna capable of receiving both left-hand circularly polarized (LHCP) signals and right-hand circularly polarized (RHCP) signals, and outputting both signals on a single feed. The antenna includes two coplanar concentric patches. The inner patch is substantially square. The outer patch surrounds the inner patch to define a gap therebetween. A resonant parallel inductive/LC circuit interconnects the two patches. The circuit includes a plurality of printed traces within the gap and interconnecting the concentric patches. The gap and each trace function as an LC circuit.