Orthogonal Diversity Antenna for Uniform Omnidirectional Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional diversity antennas face challenges in achieving full omnidirectional signal coverage in the horizontal plane due to radiation pattern weaknesses, leading to sub-optimal performance and susceptibility to signal cross-polarization and dropouts, especially in applications like wireless microphones that experience varying signal paths.
Innovation Solution
A diversity antenna system comprising a vertically polarized blade antenna and a horizontally polarized loop antenna, fixedly coupled in an orthogonal relationship, providing circular azimuth radiation patterns in both planes to minimize cross-polarization effects and ensure uniform signal coverage across 360 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dipole antenna is used to receive horizontally polarized RF energy, then the antenna can provide horizontal signal reception, but the radiation pattern experiences a weakening or null effect directly along the axis defined by the dipole antenna, resulting in non-uniform omnidirectional coverage
Solution Approach 1:
The horizontally polarized antenna element is segmented into two perpendicular dipole antennas arranged orthogonally to each other. This segmentation allows each dipole to cover different azimuth sectors, and when combined, they provide uniform 360-degree omnidirectional coverage without the null effects that plague a single dipole antenna.
2Device complexity
If a single antenna is used for wireless microphone systems, then the system is simpler, but the system is highly susceptible to multi-path interference and signal dropouts due to varying signal paths and orientations
Solution Approach 1:
The patent merges two perpendicular dipole antennas into a single integrated antenna unit that functions as a diversity antenna. This combining approach provides the signal stability and multi-path interference resistance of diversity systems while maintaining relative simplicity compared to using separate antennas and complex positioning systems.
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 significantly reduces signal cross-polarization and dropout issues, enhancing wireless communication reliability and quality by maintaining consistent signal strength across all directions, even with varying signal orientations, thus improving the performance of wireless microphone systems and other applications.
Implementation Method 1
a blade antenna for receiving vertically polarized radio frequency (RF) signals and producing a circular azimuth radiation pattern in a vertical plane
Implementation Method 2
a loop antenna for receiving horizontally polarized RF signals and producing a circular azimuth radiation pattern in a horizontal plane
Implementation Method 3
the second antenna element being coupled to the first antenna element in a fixed orthogonal relationship relative thereto
Implementation Method 4
multi-path interference occurs as radio frequency (RF) waves reflect off objects located along the signal transmission path
Data Source
AI summary
A diversity antenna for receiving radio frequency (RF) signals includes a horizontally-polarized antenna element coupled to a vertically-polarized antenna element in a fixed orthogonal relationship. The vertically-polarized antenna element is a blade antenna which includes a vertically-oriented printed circuit board (PCB) on which is disposed a pair of conductive strips. The horizontally-polarized antenna element includes two loop antennas which are arranged and conductively coupled in parallel. Each loop antenna includes a horizontally-oriented, disc-shaped PCB on which is disposed a pair of conductive loops. To facilitate the orthogonal coupling between the pair of antenna elements, each disc-shaped PCB includes a central slot dimensioned to receive the vertically-oriented PCB. In operation, the independent signal feeds produced by the first and second antenna elements can be processed to reduce any cross-polarization effects present in either signal feed, thereby providing the diversity antenna with full, omnidirectional signal coverage.