Low-Profile Broadside Antenna With Stub-Assisted Impedance Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing broadside antennas have a high profile height and large volume, which increases the load and occupies significant space in electronic devices, hindering the development of smaller, lighter, and thinner designs.
Innovation Solution
A broadside antenna design featuring a low profile and small volume is achieved through a configuration of radiation elements, grounding elements, and excitation elements, including extension stubs that improve reflection coefficients and reduce the profile height, allowing for both vertically and horizontally polarized radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional broadside antenna structure is used, then radiation performance is achieved, but profile height and volume become large
Solution Approach 1:
The patent transitions from conventional planar antenna elements to a three-dimensional folded structure. The radiation elements are folded back and forth in the vertical direction, creating multiple levels that radiate in opposite directions. This dimensional transformation allows the antenna to maintain effective radiating area while significantly reducing the horizontal footprint and overall volume.
Solution Approach 2:
The folded radiation elements are arranged in a nested configuration where multiple folding segments are contained within a compact vertical envelope. Each fold is positioned to optimize space utilization, with grounding elements and excitation structures integrated into the same vertical column, creating a densely packed nested arrangement that minimizes volume.
2Length of stationary object
If conventional broadside antenna structure is used, then radiation performance is achieved, but profile height increases
Solution Approach 1:
The radiation elements are divided into multiple discrete folding segments, each contributing to the overall radiation pattern. The elements are segmented into alternating sections that fold in opposite directions, with each segment optimized for specific radiation characteristics. This segmentation allows control over the vertical current distribution and radiation pattern while managing profile height.
Solution Approach 2:
The patent optimizes the electrical length and physical dimensions of each folding segment to achieve resonance at the operating frequency. By adjusting the length, width, and spacing of individual segments, the antenna maintains effective radiation performance while controlling the overall profile height. The grounding element length and excitation probe positioning are also tuned as parameters to optimize performance within height constraints.
3Volume of moving object
If compact antenna design is implemented, then volume is reduced, but impedance matching becomes difficult
Solution Approach 1:
A probe excitation structure serves as an intermediary coupling mechanism between the feed line and the folded radiation elements. The probe penetrates through the folding segments and connects to the central conductor, providing controlled impedance transformation. This intermediary structure simplifies the impedance matching process by decoupling the feed line interface from the complex folded element geometry, enabling standard 50-ohm impedance matching despite the compact three-dimensional configuration.
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 reduces the antenna's volume and profile height, enhancing wireless communication reliability and enabling miniaturization of electronic devices while supporting dual polarization and improved impedance matching.
Implementation Method 1
The first excitation element is configured to excite the first radiation element and the second radiation element to generate an electric field in the first direction
Data Source
AI summary
A broadside antenna includes a first radiation element and a second radiation element arranged at an interval, a first grounding element and a second grounding element arranged at an interval, and a first excitation element. A first gap is formed between the first radiation element and the second radiation element. The first excitation element includes a first feeding structure and a first extension stub that are arranged at an interval. The first feeding structure includes a first feed-in part connected to a feed source. The first extension stub is located on a side of the first feeding structure adjacent close to the first feed-in part. The first extension stub includes a first grounding part adjacent to the first feed-in part. The first grounding part is connected to the grounding surface.