Step-Type Cavity Antenna for mmWave Signal Concentration
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Solution Overview
Problem
High-frequency band RF signals used in mmWave communications are prone to absorption and loss, leading to degraded communication quality, requiring specialized antenna configurations and components to maintain gain and effective isotropic radiated power.
Innovation Solution
The antenna apparatus incorporates a dipole antenna pattern with a step-type cavity configuration, including multiple ground planes and shielding vias, along with a patch antenna pattern and feed vias, to enhance electromagnetic isolation and signal concentration, optimizing resonance frequency and bandwidth without increasing overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna configuration is used for high-frequency band communications, then the antenna structure is simple, but the antenna gain and communication quality are degraded due to signal absorption and loss
Solution Approach 1:
The ground plane is divided into multiple segments forming a stepped configuration with different levels. This segmentation creates multiple reflective surfaces that concentrate electromagnetic signals, improving antenna gain and communication reliability in high-frequency bands without requiring a completely new antenna structure
Solution Approach 2:
The antenna design transitions from a two-dimensional planar ground plane to a three-dimensional stepped structure with multiple levels. This dimensional change creates additional signal reflection paths and concentration points, enhancing antenna performance while managing the complexity through vertical space utilization
2Reliability
If the antenna size is increased to improve gain and directivity, then the antenna gain improves, but the overall device size increases
Solution Approach 1:
Instead of increasing the horizontal footprint of the antenna, the design utilizes vertical dimension by creating a stepped ground plane structure. This allows the antenna to achieve improved gain and directivity through three-dimensional signal concentration without proportionally increasing the overall device volume
Solution Approach 2:
The stepped ground plane structure changes the geometric parameters of the antenna system by creating multiple reflection surfaces at different heights and positions. This parameter modification enables enhanced signal concentration and antenna gain within a compact form factor, avoiding the need for large physical dimensions
3Adaptability or versatility
If a stepped ground plane structure is introduced to improve signal concentration, then the bandwidth expands and gain improves, but the manufacturing complexity increases
Solution Approach 1:
The ground plane is segmented into discrete stepped levels that can be manufactured using standard PCB fabrication techniques or layer-by-layer deposition processes. This segmentation approach enables the complex stepped structure to be produced through conventional manufacturing methods, reducing the impact on ease of manufacture while achieving expanded bandwidth
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 improves antenna gain and directivity, expands bandwidth, and maintains performance across high-frequency bands, supporting multi-band communications while reducing the antenna's size and electromagnetic noise.
Implementation Method 1
a first ground plane disposed rearward of the first dipole antenna pattern and spaced apart from the first dipole antenna pattern, wherein the first ground plane forms a step-type cavity
Implementation Method 2
shielding vias disposed along a front boundary line of the first ground plane and electrically connected to the second ground plane
Implementation Method 3
a first dipole antenna pattern; a feed line electrically connected to the first dipole antenna pattern
Data Source
AI summary
An antenna apparatus includes: a first dipole antenna pattern; a feed line electrically connected to the first dipole antenna pattern; and a first ground plane disposed rearward of the first dipole antenna pattern and spaced apart from the first dipole antenna pattern; wherein the first ground plane forms a step-type cavity, and width of a rear portion of the step-type cavity is different from a width of a front portion of the step-type cavity.