Monopole Antenna Factor Calibration Using a Universal Artificial Antenna
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Solution Overview
Problem
Existing methods for determining the antenna factor of a monopole antenna, such as the equivalent capacitance substitution method (ECSM), require a specific artificial antenna matching the monopole antenna and are limited in correcting the effective height if the antenna is not mounted directly on the ground, leading to measurement uncertainties.
Innovation Solution
A method using a universal artificial antenna and a calibration adapter, along with a matching device and network analyzer, to determine the antenna factor through multiple measurement setups based on scattering parameters, allowing for the calculation of capacitances and correction factors without requiring a matching artificial antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the equivalent capacitance substitution method (ECSM) is used to determine the antenna factor, then the monopole antenna can be calibrated using an artificial antenna with a capacitor, but the method requires the artificial antenna to match the monopole antenna exactly and the capacitance to be known in advance, leading to measurement uncertainties
Solution Approach 1:
The patent introduces a universal artificial antenna that can be used with different monopole antennas without requiring exact matching. The artificial antenna is combined with a matching device that adapts to different antenna configurations, allowing a single universal setup to work for multiple antenna types and heights, thereby reducing measurement uncertainties and simplifying the calibration process
Solution Approach 2:
The patent employs a matching device as an intermediary component between the universal artificial antenna and the monopole antenna under test. This matching device includes adjustable elements that can be tuned to compensate for differences in antenna characteristics, enabling accurate measurements without requiring the artificial antenna to match the monopole antenna exactly
2Measurement precision
If the equivalent capacitance substitution method is used, then the monopole antenna can be calibrated, but the ability to correct effective height is limited when the antenna is not mounted directly on the ground
Solution Approach 1:
The patent introduces a matching device with adjustable elements that can be dynamically tuned to accommodate different antenna heights and mounting positions. The adjustable components allow the system to adapt to various configurations, enabling accurate effective height correction whether the monopole antenna is mounted directly on the ground or at a distance
3Measurement precision
If a universal artificial antenna is used with a matching device and multiple measurement setups, then measurement uncertainties are reduced and calibration is simplified, but the measurement process becomes more complex with multiple steps
Solution Approach 1:
The patent performs preliminary measurements to characterize the universal artificial antenna and matching device before actual calibration. By pre-determining the scattering parameters and capacitance values of the universal components, the system can quickly calibrate different monopole antennas without repeating all measurements for each antenna type, thereby reducing overall measurement time while maintaining high precision
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 approach reduces measurement uncertainties and enables accurate determination of the antenna factor for monopole antennas at various heights and positions, using a single universal artificial antenna, thereby simplifying calibration and improving accuracy.
Implementation Method 1
measuring a scattering parameter associated with the universal artificial antenna in the second measurement setup
Implementation Method 2
determining a coupling capacitance of the universal artificial antenna in a first measurement setup
Data Source
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AI summary
The invention relates to a method for determining an antenna factor of a monopole antenna (42). A universal artificial antenna (14) is provided and its coupling capacitance is determined. A matching device (30) is connected with the universal artificial antenna (14), wherein a scattering parameter associated with the universal artificial antenna (14) is measured. A calibration adapter (16) replaces the universal artificial antenna (14), wherein a scattering parameter associated with the calibration adapter (16) is measured. An input capacitance of the matching device (30) is determined. A monopole antenna (42) is connected with the matching device (30) and the universal artificial antenna (14), wherein a scattering parameter associated with the universal artificial antenna (14) and a scattering parameter associated with the calibration adapter (16) are measured. The calibration adapter (16) replaces the universal artificial antenna (14). A capacitance of the monopole antenna (42) is calculated. The antenna factor is determined based on the capacitance of the monopole antenna (42), the coupling capacitance of the universal artificial antenna (14) and the input capacitance of the matching device (30). A measurement arrangement is shown.