Proximity Antenna Array Notch Circuits for Near-Field Isolation
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Solution Overview
Problem
Close proximity of multiple antennas leads to undesired interactions, resulting in de-tuning of resonance frequency, formation of nulls, and redirection of radiation patterns, affecting the operation of antennas in handheld and portable systems.
Innovation Solution
The implementation of notch circuits, comprising capacitors and inductors, is used to segment antennas and prevent specific frequency bands from passing between adjacent antenna segments, reducing interference by acting as band-stop filters and maintaining antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple antennas are placed in close proximity, then space utilization is improved, but antenna interactions cause de-tuning and performance degradation
Solution Approach 1:
The antenna element is divided into multiple segments with gaps between them. Notch circuits are placed in these gaps to create frequency-selective behavior. This segmentation allows the antenna to maintain its physical size while controlling electromagnetic interactions with nearby antennas through the filtering action of the notch circuits.
Solution Approach 2:
Notch circuits act as intermediary elements between adjacent antenna segments. These circuits selectively block unwanted frequencies while allowing desired frequencies to pass, thereby mediating the electromagnetic interaction between closely spaced antennas and preventing harmful coupling effects.
2Object-affected harmful factors
If notch circuits are added to prevent frequency interference, then antenna isolation is improved, but device complexity increases
Solution Approach 1:
The notch circuits are integrated directly into the antenna structure by placing them at the gaps between segmented antenna elements. This merging of the filtering function into the antenna geometry itself eliminates the need for separate filtering components, thereby reducing overall device complexity while maintaining frequency-selective isolation.
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 solution effectively reduces interference between antennas, minimizing the impact on their operating frequencies and radiation patterns, while maintaining efficiency and aperture size, thus enhancing the performance of antenna arrays in close proximity.
Implementation Method 1
The notch circuit prevents a first frequency of a signal from passing from the first antenna segment to the second antenna segment while allowing a second frequency from the signal to pass from the first antenna segment to the second antenna segment
Implementation Method 2
The notch circuit includes a capacitor in parallel with an inductor
Implementation Method 3
The first antenna occupies a second near field region of the second antenna and the second antenna occupies a first near field region of the first antenna
Data Source
AI summary
A system includes a first antenna and a second antenna. The first antenna includes an antenna section. The antenna section includes a first antenna segment, a second antenna segment adjacent to the first antenna segment, and a notch circuit disposed within a notch between the first antenna segment and the second antenna segment. The notch circuit prevents a first frequency of a signal from passing from the first antenna segment to the second antenna segment while allowing a second frequency from the signal to pass from the first antenna segment to the second antenna segment. The second antenna is disposed proximate to the first antenna. The first antenna occupies a second near field region of the second antenna and the second antenna occupies a first near field region of the first antenna.