Planar Array Antenna with Strip Conductor and Loop Elements
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Solution Overview
Problem
Conventional array antenna devices face challenges with complex feeding circuits, large size, and difficulty in controlling radiation amplitude and suppressing sidelobes, which limits their high-gain radiation capabilities.
Innovation Solution
A planar array antenna design featuring a substrate with a strip conductor and loop elements of approximately one wavelength in circumference, electromagnetically coupled and arranged alongside the strip conductor, allowing for adjustable radiation power and reduced sidelobes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a branching circuit is used to feed patch elements, then power can be distributed to multiple radiation elements, but the feeding circuit becomes complex and the mounting area increases
Solution Approach 1:
The patent extracts the complex branching circuit from the feeding system and replaces it with a simple strip conductor. The strip conductor directly feeds multiple loop elements without requiring complex power distribution networks, thereby eliminating the feeding circuit complexity while maintaining the ability to power multiple radiation elements.
Solution Approach 2:
The loop elements are designed to be self-fed through electromagnetic coupling with the strip conductor. Each loop element automatically receives power through its proximity to the strip conductor without requiring individual feeding connections or complex distribution circuits,实现ing self-service feeding.
2Device complexity
If loop elements are arranged at regular distances, then the structure is simple, but the radiation amount of each element cannot be controlled in a wide range
Solution Approach 1:
The patent applies local quality by varying the distance between the strip conductor and individual loop elements. While the loop elements are arranged at regular intervals along the strip conductor, the perpendicular distance from each loop element to the strip conductor is locally adjusted. This allows each loop element to have different coupling strength with the strip conductor, enabling independent control of radiation amount for each element while maintaining overall structural simplicity.
3Area of stationary object
If the number of radiation cells is reduced, then the device size is smaller, but sidelobes cannot be suppressed effectively
Solution Approach 1:
The patent employs parameter changes by adjusting the distance parameters between the strip conductor and each loop element. By varying these distance parameters, the radiation amount of each loop element is optimized to achieve sidelobe suppression. This allows effective sidelobe control with a reduced number of loop elements, as each element's radiation characteristic is precisely tuned through parameter optimization rather than relying on numerous 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 design achieves high-gain radiation with a simple configuration by suppressing sidelobes and enabling precise control of radiation patterns, enhancing the directivity and efficiency of radio wave transmission.
Implementation Method 1
each of the loop elements has a circumferential length that is approximately equal to one wavelength of a radiated radio wave, and is disposed at such a position as to be coupled with the strip conductor electromagnetically
Data Source
AI summary
An array antenna device includes a substrate, a strip conductor formed on one surface of the substrate, plural loop elements formed on the one surface of the substrate, and a conductor plate formed on the other surface of the substrate. Each of the loop elements has a circumferential length that is approximately equal to one wavelength of a radiated radio wave, and is disposed at such a position as to be coupled with the strip conductor electromagnetically, and the loop elements are arranged alongside the strip conductor at distances that are equal to the one wavelength.