Log-Periodic Dipole Array Antenna With Integrated Band Stopper
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Solution Overview
Problem
Conventional log-periodic dipole array (LPDA) antennas require additional filter circuits to selectively use desired frequencies, increasing cost, weight, and size due to their broadband characteristics, which limits their efficiency in specific frequency bands.
Innovation Solution
Incorporating a band stopper on the radiating element of the LPDA antenna, which connects lines in an alternating manner and extends from the center to the outer side, allowing for improved signal characteristics and reduced system weight and size by eliminating the need for an additional filter circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional filter circuits are mounted to selectively use desired frequencies, then frequency selectivity is improved, but device complexity, weight, and size increase
Solution Approach 1:
The patent extracts the filtering function from separate external filter circuits and integrates it directly into the radiating element structure through the band stopper. This eliminates the need for additional filter components while maintaining frequency selectivity, thereby reducing device complexity, weight, and size.
Solution Approach 2:
The patent combines the filtering function with the radiating element by incorporating the band stopper structure into the antenna's radiating element. This merging of functions allows the same structure to serve both as the radiating element and the frequency-selective filter, reducing the overall number of components.
2Measurement precision
If additional filter circuits are mounted to selectively use desired frequencies, then frequency selectivity is improved, but weight increases
Solution Approach 1:
The patent extracts the filtering function from separate external filter circuits and integrates it directly into the radiating element structure through the band stopper. This eliminates the need for additional filter components while maintaining frequency selectivity, thereby reducing device complexity, weight, and size.
Solution Approach 2:
The patent combines the filtering function with the radiating element by incorporating the band stopper structure into the antenna's radiating element. This merging of functions allows the same structure to serve both as the radiating element and the frequency-selective filter, reducing the overall number of components.
3Measurement precision
If additional filter circuits are mounted to selectively use desired frequencies, then frequency selectivity is improved, but size increases
Solution Approach 1:
The patent extracts the filtering function from separate external filter circuits and integrates it directly into the radiating element structure through the band stopper. This eliminates the need for additional filter components while maintaining frequency selectivity, thereby reducing device complexity, weight, and size.
Solution Approach 2:
The patent combines the filtering function with the radiating element by incorporating the band stopper structure into the antenna's radiating element. This merging of functions allows the same structure to serve both as the radiating element and the frequency-selective filter, reducing the overall number of components.
4Adaptability or versatility
If broadband characteristic is utilized to transmit and receive multiple frequencies, then frequency coverage is improved, but signal quality in specific bands deteriorates
Solution Approach 1:
The patent applies local quality by making different parts of the radiating element have different properties. The band stopper is placed at specific locations to create frequency-dependent characteristics, allowing the antenna to maintain broadband coverage while achieving high signal quality in specific frequency bands through localized filtering.
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 band stopper enhances signal reflection loss and gain in desired frequency bands, enabling efficient multi-band operation without additional filters, thus improving antenna performance and reducing system weight and size.
Implementation Method 1
a radiating element having a plurality of lines extending from a center to an outer side and symmetrically arranged on the dielectric substrate based on the center, so as to resonate in a first frequency band and a second frequency band
Implementation Method 2
a band stopper formed on one point for connecting the lines to each other... the band stopper may be located adjacent to an upper side of the radiating element to reduce antenna gain with respect to a signal adjacent to the first frequency band
Data Source
AI summary
A log-periodic dipole array antenna according to one exemplary embodiment of the present disclosure includes a dielectric substrate, a radiating element having a plurality of lines extending from a center to an outer side and symmetrically arranged on the dielectric substrate based on the center, so as to resonate in a first frequency band and a second frequency band, the plurality of lines being connected at the center or the outer side of the radiating element in an alternating manner, the lines becoming longer going from up to down of the radiating element fed according to a predetermined log-periodic ratio, and a band stopper formed on one point for connecting the lines to each other.