PCB UWB Antenna Structure With Equal-Length Feed Lines
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Solution Overview
Problem
Existing ultra-wideband (UWB) antennas are bulky and difficult to integrate into consumer electronics, and the use of coaxial cables for signal feeding leads to phase differences between antennas, affecting positioning accuracy.
Innovation Solution
An ultra-wideband antenna structure is designed with two radiating elements and feeding transmission lines on a printed circuit board within a metal housing, where the radiating elements' projections overlap with slots in the housing, and the feeding transmission lines are kept equal in length to minimize phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If existing UWB antenna modules are used, then antenna functionality is achieved, but the volume is large and difficult to integrate into consumer electronics
Solution Approach 1:
The antenna system is segmented into two separate radiating elements integrated directly onto the PCB board, eliminating the need for a single bulky modular antenna. Each radiating element is positioned near corresponding slots in the metal housing, allowing distributed integration throughout the device structure.
Solution Approach 2:
The antenna structure is merged with the PCB board and metal housing assembly. The radiating elements are fabricated on the PCB same as other circuit components, and the metal housing slots serve as part of the antenna structure, combining multiple functions into a unified integrated design.
2Measurement precision
If coaxial cables are used for signal feeding, then signal transmission is achieved, but phase differences occur between antennas affecting positioning accuracy
Solution Approach 1:
The mechanical coaxial cable feeding system is replaced with an integrated PCB transmission line system. The feeding transmission lines are etched directly onto the PCB board, providing precise control over electrical length and eliminating the mechanical tolerances and phase inconsistencies associated with coaxial cable connections.
3Adaptability or versatility
If radiating elements are positioned near metal housing slots, then antenna radiation characteristics are improved, but the design complexity increases
Solution Approach 1:
The metal housing slots serve dual functions: as structural components of the device enclosure and as integral parts of the antenna radiation system. The slots are designed to work with the radiating elements to enhance radiation characteristics, eliminating the need for separate antenna housing modifications.
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 allows for compact integration of UWB antennas with minimal impact on product appearance and ensures consistent phases between radiating elements, improving positioning accuracy by reducing phase differences caused by coaxial cable tolerances.
Implementation Method 1
two radiating elements disposed on the printed circuit board and close to the two slots... Projections of the two radiating elements projected onto the metal housing at least partially overlap with the two slots
Data Source
AI summary
An electronic device and an antenna structure are provided. The electronic device includes a metal housing, and the antenna structure is disposed in the metal housing. The antenna structure includes a printed circuit board, two radiating elements, two feeding transmission lines and a connector. The two radiating elements are disposed on the printed circuit board and are close to the two slots. Projections of the two radiating elements projected onto the metal housing at least partially overlap with the two slots. The two feeding transmission line are disposed in the printed circuit board. The two feeding transmission lines are electrically connected to the two radiating elements, respectively, and lengths of the two feeding transmission lines are the same. The connector is connected to the printed circuit board and electrically connected to the two feeding transmission lines.