Antenna Configuration for Multi-Frequency Wireless Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna designs struggle to provide optimized radiation performance in both the horizontal plane and the direction of the sky, particularly in wireless communication devices that require multi-frequency operation, such as those with GPS features, due to inherent limitations in omnidirectional antennas.
Innovation Solution
The proposed antenna configuration combines a monopole antenna and a GPS antenna, arranged in an end-fire array with a quarter wavelength progressive phase difference, and utilizes controlled overlap or coupling techniques to achieve optimized radiation patterns, ensuring efficient operation in discrete frequency bands and minimizing frequency shift when in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single antenna structure is designed to operate in multiple frequency bands, then multi-frequency operation is achieved, but radiation performance optimization in both horizontal and vertical directions becomes difficult
Solution Approach 1:
The antenna is divided into two portions with different structural characteristics optimized for different frequency ranges. The first portion is optimized for lower frequency bands (e.g., 850/1900 MHz) providing omnidirectional coverage, while the second portion is optimized for higher frequency bands (e.g., GPS L1/L2 bands) providing vertical directionality. This segmentation allows each portion to maintain optimal radiation performance across its designated frequency range.
Solution Approach 2:
Different portions of the antenna structure are given different local qualities or characteristics. The first portion has structural properties (such as length, geometry, and positioning) optimized for horizontal omnidirectional radiation, while the second portion has different properties optimized for vertical directional radiation. This local differentiation enables each portion to excel at its specific function while the combined system operates across multiple frequency bands.
2Adaptability or versatility
If GPS functionality is added to wireless communication devices with omnidirectional antennas, then device functionality is improved, but GPS performance is reduced due to poor vertical directionality
Solution Approach 1:
The antenna system is segmented to dedicate the second portion specifically for GPS signal reception with optimized vertical directionality toward the sky. This portion is tuned to GPS frequency bands (L1 at 1575.42 MHz and L2 at 1227.60 MHz) and positioned/oriented to maximize satellite signal acquisition, while the first portion handles general wireless communication. This segmentation ensures GPS performance is not compromised by the omnidirectional design.
3Ease of manufacture
If the antenna portions are directly overlapped to reduce mechanical complexity, then manufacturing is simplified, but coupling control and frequency shift minimization become more challenging
Solution Approach 1:
The antenna portions are arranged in a nested or overlapping configuration where the second portion is positioned within or alongside the first portion. This nesting approach reduces the overall mechanical complexity and footprint of the antenna system while maintaining the necessary electrical coupling between portions. The overlapping structure allows for simplified assembly and integration into the device housing.
Solution Approach 2:
The patent introduces an intermediary coupling mechanism between the first and second antenna portions to control the electromagnetic coupling and minimize frequency shifts. This intermediary element (which may be a coupling structure, spacing element, or grounding arrangement) provides a controlled interface that manages the interaction between the two portions, ensuring stable frequency performance while allowing for practical manufacturing tolerances.
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 provides twice the current industry standard efficiency for GPS performance and up to 60% upper hemisphere efficiency, while maintaining performance when in-hand, and simplifies the mechanical structure for cost reduction.
Implementation Method 1
An antenna is a specialized electronic device that converts energy from one form to another. An antenna couples radio waves in free space to electrical current used by electronic equipment
Implementation Method 2
The first portion and second portion are coupled by directly overlapping the first end of the second portion and the second end of the first portion or by overlapping another material over the first end of the second portion and the second end of the first portion
Data Source
AI summary
Antenna apparatuses and methods used in wireless communication devices are disclosed. The antenna includes a first portion configured to be coupled to a communication device. The antenna also includes a second portion configured to be coupled to the first portion. The first portion and second portion are coupled by overlapping the first portion and second portion so as to produce an omnidirectional radiation pattern and a vertical radiation pattern.