Phased Antenna Ground Layout for Unwanted Radiation Suppression
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Solution Overview
Problem
Existing array antennas radiate radio waves in directions other than the target radiation direction, leading to unnecessary radiation and reduced directivity.
Innovation Solution
The antenna design includes a first and second radiating conductor with opposite open ends, a planar ground conductor, a shielding ground conductor between the open ends, and a feed line that feeds the conductors with a predetermined phase difference, along with an end portion ground conductor to suppress unnecessary radiation and enhance directivity in the target direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an array antenna with inverted-F antenna and parasitic elements is used, then directivity in radiation direction is improved, but unnecessary radiation in directions other than target direction occurs
Solution Approach 1:
The ground conductor is divided into multiple segments: a planar ground conductor, a shielding ground conductor positioned between the open ends, and an end portion ground conductor. Each segment serves a specific function in controlling radiation patterns and suppressing unnecessary radiation while maintaining directivity in the target direction.
Solution Approach 2:
The shielding ground conductor acts as an intermediary element positioned between the first and second open ends. It mediates the electromagnetic field distribution to prevent radiation in unwanted directions while allowing the primary radiation function to operate effectively.
2Measurement precision
If parasitic elements are added to improve directivity, then radiation control in target direction is enhanced, but device complexity increases
Solution Approach 1:
The ground conductor structure performs multiple functions simultaneously: it provides grounding, acts as a shielding element to suppress side radiation, and serves as a reference plane for the radiating conductors. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The shielding ground conductor and end portion ground conductor are integrated with the planar ground conductor to form a unified ground structure. This merging of functions into a single integrated system reduces overall device complexity while achieving the desired radiation control.
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 suppresses unnecessary radiation and enhances directivity in the target direction by utilizing destructive interference and phase differences, resulting in improved radiation control.
Implementation Method 1
a feed line that feeds the first radiating conductor and the second radiating conductor with power with a predetermined phase difference from each other
Implementation Method 2
This configuration suppresses unnecessary radiation and enhances directivity in the target direction by utilizing destructive interference and phase differences
Implementation Method 3
This configuration suppresses unnecessary radiation and enhances directivity in the target direction by utilizing destructive interference and phase differences
Data Source
AI summary
An antenna includes a first radiating conductor having a first open end and a first feed point, a second radiating conductor that has a second open end and a second feed point and is disposed such that the second open end is opposite to the first open end, and a planar ground conductor that overlaps with the first radiating conductor and the second radiating conductor in plan view. The antenna includes also a shielding ground conductor disposed between the first open end and the second open end in plan view, an end portion ground conductor connected to the first radiating conductor and the second radiating conductor in plan view, and a feed line that feeds the first radiating conductor and the second radiating conductor with power with a predetermined phase difference from each other.