Bidirectional Antenna Assembly Using Passive Conductive Elements
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Solution Overview
Problem
Conventional antennas lack bidirectional radiation patterns, which limits their ability to provide effective signal coverage in multiple directions, particularly in terrestrial and satellite communications, where both azimuth and elevation angles are crucial.
Innovation Solution
A bidirectional antenna assembly is designed with a radiative assembly connected to passive conductive elements, including planar sheets and corner reflectors, arranged at specific angles to create a cylindrical enclosure, enabling a bidirectional radiation pattern by interacting with the radiative assembly to provide substantial gain in two opposing directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna is used, then the structure is simple, but the radiation pattern is limited to single direction or omnidirectional without bidirectional capability
Solution Approach 1:
The antenna is segmented into distinct functional components: a radiating element and separate passive conductive elements (corner reflectors or planar sheets). This segmentation allows the radiating element to maintain simplicity while the passive elements provide the bidirectional radiation capability through geometric arrangement, resolving the contradiction between structural simplicity and bidirectional functionality.
Solution Approach 2:
The patent introduces passive conductive elements arranged in three-dimensional space at specific angles (greater than 90 degrees) relative to the radiating element. This dimensional arrangement creates bidirectional radiation patterns without complicating the radiating element itself, as the directionality emerges from the spatial configuration of the passive elements rather than from the radiating element's structure.
2Power
If directional antenna is used to improve gain in one direction, then transmission efficiency is improved, but coverage in other directions is reduced
Solution Approach 1:
The passive conductive elements are arranged asymmetrically at angles greater than 90 degrees relative to the radiating element, creating a configuration that directs energy into two opposite lobes. This asymmetric arrangement provides high gain in two specific directions simultaneously, resolving the contradiction between concentrated gain and broad coverage by distributing power strategically rather than uniformly.
Solution Approach 2:
By arranging passive conductive elements in three-dimensional space at specific angular orientations, the antenna creates bidirectional radiation lobes that extend coverage area in opposite directions while maintaining high gain. This spatial dimensionality allows the antenna to achieve both concentrated power transmission and extended coverage area that would be mutually exclusive in a single-directional configuration.
3Area of stationary object
If omnidirectional antenna is used to provide coverage in all directions, then signal availability is improved, but interference from all directions increases
Solution Approach 1:
The asymmetric arrangement of passive conductive elements at angles greater than 90 degrees creates directional radiation lobes that concentrate energy in two opposite directions while creating nulls in other directions. This asymmetry provides broad coverage area in the intended directions while simultaneously reducing interference reception from directions perpendicular to the lobes, resolving the contradiction between coverage area and interference susceptibility.
Solution Approach 2:
The passive conductive elements, which could be considered additional complexity, actually convert potential interference into beneficial directional patterns. By reflecting and redirecting electromagnetic energy, these elements create radiation lobes that provide coverage while naturally rejecting signals from directions between the lobes, thus converting what would be omnidirectional interference into directional selectivity that reduces harmful interference.
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 allows for enhanced signal coverage in multiple directions, improving communication efficiency and reducing interference by confining the radiation pattern to specific lobes, suitable for applications like vehicle-mounted antennas to provide reliable coverage along their length.
Implementation Method 1
The passive conductive element interacts with the radiative assembly to provide a bidirectional radiation pattern
Implementation Method 2
A first corner reflector is formed from two planar structures formed from a conductive material meeting at a common edge and physically connected to the ground plane
Data Source
AI summary
A bidirectional antenna assembly includes a radiative assembly operatively connected to an antenna feed and at least one passive conductive element. The passive conductive element includes at least first and second planar conductive sheets, each which are substantially perpendicular to a plane passing through the connection of the radiative assembly to the antenna field and arranged at an angle greater than ninety degrees relative to one another. The passive conductive element interacts with the radiative assembly to provide a bidirectional radiation pattern.