PCB Beam-Forming Antenna With Switchable Radiators
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Solution Overview
Problem
Two-dimensional printed circuit board antennae lack the ability to control and focus radiation beam direction and strength, as they typically produce an omnidirectional radiation pattern, which is not suitable for applications requiring directional signal coverage.
Innovation Solution
Incorporating a ground plane and switchable radiator elements on a printed circuit board, where the primary radiator element is coupled to a transceiver and switchable elements can be selectively connected to either the transceiver or ground via an RF switch unit, allowing for adjustable aperture spacings and configurations to alter the radiation pattern from omnidirectional to directional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional two-dimensional printed circuit board antenna is used, then the antenna can be implemented cost-effectively with minimal space, but the radiation pattern is omnidirectional and cannot be controlled or focused in specific directions
Solution Approach 1:
The antenna structure is segmented into multiple independent radiator elements (first, second, third, and fourth radiator elements) that can be independently controlled. Each radiator element can be selectively connected to the signal path or ground through switches, allowing independent control of each segment to achieve beam forming and directional radiation patterns.
Solution Approach 2:
The antenna structure incorporates dynamic switching capability where the connection state of each radiator element can be changed in real-time. The switches enable each radiator element to be dynamically connected or disconnected from the signal path, allowing the radiation pattern to be adaptively adjusted between omnidirectional and directional modes based on communication requirements.
2Adaptability or versatility
If switchable radiator elements are added to enable beam control, then directional signal coverage is achieved, but the device complexity increases
Solution Approach 1:
The switching function is extracted as a separate control mechanism independent of the radiator elements themselves. Each radiator element is equipped with its own switch that can be independently controlled, allowing the radiation pattern to be adjusted by selectively connecting or disconnecting specific radiator elements from the signal path without modifying the radiator elements' inherent structure.
Solution Approach 2:
The ground plane serves multiple functions: it provides the reference ground for the antenna system, acts as a reflector to shape the radiation pattern, and serves as the connection point for the switchable radiator elements. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity.
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
Enables flexible control over the directionality and power of the signal beam, allowing for optimized signal coverage and power usage in specific directions, enhancing the antenna's functionality beyond standard omnidirectional patterns.
Implementation Method 1
The antenna structure includes a ground plane, a primary radiator element, and at least one switchable radiator element... enabling flexible control over the directionality and power of the signal beam
Data Source
AI summary
A two-dimensional antenna includes a ground plane, a primary radiator element, and at least one switchable radiator element. The ground plane comprises an electrically conductive material and is electrically coupled to an electrical ground. The primary radiator element is disposed in a coplanar relationship to said ground plane and is electrically coupled to a signal path of a transceiver. The at least one switchable radiator element is disposed in a coplanar relationship to the ground plane and the primary radiator element and is selectably electrically couplable to one of the signal path of the transceiver and the electrical ground.