Antenna Element Parasitic Conductor Patterns Spurious Radiation
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Solution Overview
Problem
Array antennas lack a mechanism to suppress spurious radiation and unwanted wave reception, leading to signal quality deterioration and sensitivity issues, necessitating additional filter functions in the front-end circuit, which complicates miniaturization.
Innovation Solution
The antenna element incorporates a dielectric layer with specific conductor patterns arranged to create bandpass filter characteristics, allowing for self-suppression of unwanted waves and improved reception sensitivity, eliminating the need for separate filter circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional array antenna is used for wireless communication, then directivity control of antenna radiation is achieved, but spurious radiation and unwanted wave reception cannot be suppressed, leading to signal quality deterioration
Solution Approach 1:
The patent merges the antenna radiation function with the filter function into a single integrated structure. The parasitic conductor patterns are positioned to simultaneously serve as both radiating elements and filtering elements, eliminating the need for separate filter circuits and directly suppressing spurious radiation at its source.
Solution Approach 2:
The parasitic conductor patterns perform multiple functions: they act as radiating elements for the desired signal while simultaneously functioning as filtering elements to suppress spurious radiation and unwanted waves. This multi-functionality resolves the contradiction by making the harmful suppression function inherent to the antenna structure itself.
2Reliability
If a filter circuit is added to the front end to suppress spurious radiation and unwanted waves, then signal quality is improved, but the device size increases and miniaturization becomes difficult
Solution Approach 1:
The filter function is merged into the antenna structure itself through the strategic positioning of parasitic conductor patterns. This integration eliminates the need for separate filter circuits, thereby maintaining signal quality while preventing any increase in device volume.
Solution Approach 2:
The antenna structure provides its own filtering function through the parasitic conductor patterns, which automatically suppress spurious radiation and unwanted waves without requiring external filter circuits. This self-service capability resolves the size contradiction by making the filtering function inherent rather than additive.
3Ease of operation
If parasitic patches are arranged offset from the center of power feeding patches, then phase adjustment is simplified, but filter function for suppressing unwanted waves is not provided
Solution Approach 1:
The parasitic conductor patterns are designed to simultaneously provide phase adjustment capability and filtering function. By carefully controlling the positioning and dimensions of these patterns, the antenna achieves both ease of phase adjustment and automatic suppression of unwanted waves through the same structural elements.
Solution Approach 2:
The patent optimizes specific parameters such as the positioning, size, and spacing of the parasitic conductor patterns to achieve dual functionality. By adjusting these parameters, the antenna simultaneously achieves easy phase adjustment and effective filtering of spurious radiation without compromising either function.
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
This configuration enhances antenna gain with bandpass filter characteristics, effectively suppressing spurious radiation and improving reception sensitivity, enabling miniaturization of the front-end circuit and multi-band/multi-mode communication capabilities.
Implementation Method 1
a resonant frequency defined by opposite-phase mode currents flowing through the power feeding conductor pattern and the first parasitic conductor pattern is higher than a resonant frequency defined by in-phase mode currents flowing through the power feeding conductor pattern and the first ground conductor pattern, and a resonant frequency defined by opposite-phase mode currents flowing through the power feeding conductor pattern and the second parasitic conductor pattern is lower than the resonant frequency defined by the in-phase mode currents
Data Source
AI summary
A patch antenna includes a power feeding conductor pattern formed in a dielectric layer, a ground conductor pattern formed on the dielectric layer, a first parasitic conductor pattern and a second parasitic conductor pattern formed in/on the dielectric layer and is not set to have a ground potential. The first parasitic conductor pattern, the power feeding conductor pattern, the second parasitic conductor pattern, and the ground conductor pattern are arranged in this order in a cross section and overlap each other in a plan view. A resonant frequency f1 defined by an opposite-phase mode current flowing through the first parasitic conductor pattern is higher than a resonant frequency f2 defined by an in-phase mode current flowing through the power feeding conductor pattern, and a resonant frequency f3 defined by an opposite-phase mode current flowing through the second parasitic conductor pattern is lower than the resonant frequency f2.