Multi-function Antenna with Asymmetric CPW Radiator
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Solution Overview
Problem
The use of multiple antennas in vehicles for various functions is costly and occupies excessive space, as each antenna serves a specific purpose and requires separate mounting.
Innovation Solution
A multi-functional antenna design utilizing a coplanar waveguide transmission line and a radiating portion that produces linear and circular polarizations at different frequencies, minimizing the need for multiple antennas by integrating these functions into a single structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are used for different functions (cellular, GPS, satellite radio), then communication and navigation functionality is improved, but manufacturing cost and installation complexity increase
Solution Approach 1:
The patent combines multiple antenna functions (cellular, GPS, satellite radio) into a single integrated antenna structure. The antenna element is designed with specific geometric configurations including rectangular patches and circular arcs that enable it to operate across multiple frequency bands and support different polarization modes, thereby eliminating the need for separate antennas for each function and reducing manufacturing cost.
Solution Approach 2:
The antenna is designed as a universal multi-functional device that can perform cellular communication, GPS reception, and satellite radio functions simultaneously. The radiation pattern characteristics and impedance matching are optimized to support diverse applications across L-band and S-band frequencies, making a single antenna structure capable of replacing multiple specialized antennas.
2Adaptability or versatility
If multiple antennas are mounted on the vehicle, then functional coverage is improved, but occupied space increases
Solution Approach 1:
The patent merges multiple antenna functions into a single physical structure mounted on the vehicle. By integrating cellular, GPS, and satellite radio capabilities into one antenna element with optimized radiation patterns, the design reduces the number of separate mounting locations required while maintaining comprehensive functional coverage across different frequency bands and service types.
3Adaptability or versatility
If multiple antennas are used for different frequency bands, then frequency coverage is improved, but device complexity increases
Solution Approach 1:
The antenna design employs local quality variations in the radiating element geometry, with specific rectangular patch dimensions and circular arc configurations optimized for different frequency bands. The impedance matching network and ground plane are also locally optimized to support L-band and S-band operations, enabling a single structure to achieve broad frequency coverage through spatially varying electromagnetic properties.
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 solution reduces manufacturing and installation costs while minimizing space, providing effective communication and navigation capabilities across various frequency bands with a single, compact antenna.
Implementation Method 1
The radiating portion is coupled to the CPW transmission line and is configured to produce a linear polarization at a first frequency and a circular polarization at a second frequency
Implementation Method 2
The radiating portion is configured to produce a linear polarization at a first frequency and a circular polarization at a second frequency
Data Source
AI summary
An antenna includes a CPW transmission line and a radiating portion. The radiating portion is coupled to the CPW transmission line and is substantially coplanar with the CPW transmission line. The radiating portion is configured to produce a first linear polarization at a first frequency, a circular polarization at a second frequency, and a second linear polarization at a third frequency. The radiating portion includes a conductive material extending from the CPW transmission line and forming a plurality of openings in the radiating portion. The openings are asymmetric with respect to a first region of the radiating portion that is disposed on a first side of the CPW transmission line and a second region of the radiating portion that is disposed on a second side of the CPW transmission line.