Air-Strip Antenna Feed Line Layout to Reduce Radiating Interference
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Solution Overview
Problem
The increasing size of feed lines with air-strip structures relative to radiating elements in antenna assemblies leads to increased interference and deteriorated radiation characteristics, particularly in high-frequency applications, making horizontal antenna arrangement challenging.
Innovation Solution
The antenna assembly incorporates a feed line with a bent main line region and connection line regions, minimizing the occupied area on the base and reducing interference by forming a delay line to compensate for longer feed line lengths, allowing for more compact and efficient horizontal antenna arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an air-strip structure is used for the feed line to reduce dielectric loss, then the gain of the antenna is improved, but the area of the transmission line increases relative to the radiating element
Solution Approach 1:
The feed line is configured to extend in the vertical direction (z-axis) rather than occupying horizontal space on the base. The main line region is positioned above the base at a predetermined height, utilizing the third dimension to reduce the horizontal area occupied by the transmission line while maintaining the air-strip structure for low dielectric loss
2Loss of energy
If the area of the transmission line increases, then dielectric loss is reduced, but the interference between the transmission line and radiating element increases
Solution Approach 1:
By positioning the main line region vertically above the base rather than horizontally on the base, the feed line is spatially separated from the radiating elements. This vertical arrangement reduces electromagnetic interference between the transmission line and radiating elements while preserving the low dielectric loss characteristics of the air-strip structure
Solution Approach 2:
The feed line structure is optimized locally by configuring the main line region to extend vertically above specific areas of the base, creating spatial separation zones between the transmission line and radiating elements to minimize interference in critical regions
3Speed
If the size of the radiating element decreases to increase operating frequency, then the operating frequency is improved, but the relative area of the transmission line increases
Solution Approach 1:
The feed line utilizes the vertical dimension by extending the main line region above the base, which decouples the transmission line area from the radiating element size. This allows the radiating elements to be made smaller for higher operating frequencies without proportionally increasing the relative area of the transmission line, since the feed line occupies vertical rather than horizontal space
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 design reduces interference between the feed line and radiating elements, maintaining radiation characteristics and enabling efficient horizontal arrangement of antennas, even at higher frequencies.
Implementation Method 1
A transmission line with an air-strip structure has a dielectric loss close to '0' because the conductor is surrounded by air. Therefore, when the transmission line is implemented as an air-strip, dielectric loss can be reduced, and through this, the gain of the antenna can be increased.
Implementation Method 2
a main line region bent at a predetermined angle at the other end of the connection line region and formed along the first direction from a side surface of the antenna group
Data Source
AI summary
An antenna device is provided. The antenna device includes a base; an antenna group including a plurality of radiating elements disposed on the base along a first direction; and a feed line configured to feed power to the plurality of radiating elements, the feed line having an air-strip structure, wherein the feed line includes: a plurality of connection line regions configured such that one end is connected to each radiating element of the plurality of radiating elements, and a main line region bent at a predetermined angle at the other end of the connection line region and formed along the first direction from a side surface of the antenna group.