Symmetrical PIFA Antenna for Dual Circular Polarization
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Solution Overview
Problem
Current satellite receiving systems require two separate antennas for receiving right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) signals, resulting in insufficient radiation efficiency and directionality, and are limited by the thickness and cost of ceramic materials used in patch or chip antennas.
Innovation Solution
An antenna structure comprising two or more identical planar inverted-F antennas (PIFAs) symmetrically arranged around a signal feeding element on a PCB substrate, allowing simultaneous reception of RHCP and LHCP signals, replacing traditional ceramic chip antennas with a thinner and more cost-effective PCB material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate ceramic chip antennas are used to receive RHCP and LHCP signals, then the receiving capability for both polarizations is achieved, but the device thickness increases to 5-10mm and the cost increases
Solution Approach 1:
The patent combines two separate ceramic chip antennas into a single planar inverted-F antenna structure that can simultaneously receive both RHCP and LHCP signals. The PIFA structure integrates the functions of two antennas into one, eliminating the need for separate components and reducing overall thickness from 5-10mm to under 2mm.
Solution Approach 2:
The planar inverted-F antenna is designed with multi-functionality to perform both RHCP and LHCP signal reception within a single structure. By configuring the radiator and grounding elements appropriately, the antenna achieves universal receiving capability for both circular polarizations, replacing the need for specialized separate antennas.
2Adaptability or versatility
If two separate ceramic chip antennas are used to receive RHCP and LHCP signals, then the receiving capability for both polarizations is achieved, but the manufacturing cost increases due to ceramic material requirements
Solution Approach 1:
The patent replaces expensive ceramic chip antennas with a PCB-based planar inverted-F antenna structure. The PCB material is significantly cheaper than ceramic materials, and the antenna can be manufactured using standard PCB fabrication processes, thereby reducing manufacturing costs while maintaining the dual polarization receiving capability.
Solution Approach 2:
The patent substitutes the ceramic material-based antenna structure with a PCB-based planar structure. This replacement transitions from a mechanical/ceramic system to a printed circuit board system, enabling easier manufacturing, lower costs, and better integration with modern electronic devices.
3Device complexity
If a single antenna is used to receive signals, then the device structure is simplified, but the radiation efficiency and directionality of magnetic field are insufficient for simultaneous RHCP and LHCP reception
Solution Approach 1:
The patent employs dynamic configuration of the radiator and grounding elements within the PIFA structure to achieve both RHCP and LHCP reception. The antenna structure can dynamically adapt its current distribution and radiation pattern through proper element configuration, maintaining high radiation efficiency and directionality for both polarizations simultaneously.
Solution Approach 2:
The patent transitions from the traditional two-dimensional surface mounting of ceramic chip antennas to a three-dimensional planar inverted-F structure with vertical grounding elements. This dimensional change enables the antenna to achieve better radiation efficiency and directionality by utilizing vertical current paths and improved ground coupling, while still maintaining a compact form factor.
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 antenna structure achieves optimal performance in receiving both RHCP and LHCP signals with improved radiation efficiency and wider directionality, reducing thickness and manufacturing costs while meeting operational demands for satellite communication systems like GPS.
Implementation Method 1
The antenna structure includes a substrate, a radiation element, a signal feeding element, and a grounding element... allowing simultaneous reception of RHCP and LHCP signals
Data Source
AI summary
An antenna structure consists of a substrate, a radiation element, a signal feeding element, and a grounding element. The radiation element includes a first radiator and a second radiator coupled to the first radiator, wherein the first radiator is identical to the second radiator. The signal feeding element is coupled to a joint of the first radiator and the second radiator, wherein the first radiator and the second radiator are symmetrically disposed in the left and right sides of the signal feeding element to permute an array. The grounding element includes a first grounding sub-element and a second grounding sub-element, wherein the first grounding sub-element is coupled between the first radiator and the substrate and the second grounding sub-element is coupled between the second radiator and the substrate. The first grounding sub-element is identical to the second grounding sub-element.