Antenna Module Resonance Circuit for Compact Dual-Polarization Filtering
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Solution Overview
Problem
There is a demand for miniaturization of antenna modules with integrated filters, particularly in dual polarization type antenna devices, and for improved filter characteristics such as increased attenuation in non-pass bands and steepness in the vicinity of the pass band.
Innovation Solution
The antenna module incorporates a dielectric substrate with a radiating element, first and second ground electrodes, and a resonance circuit comprising multiple resonators. The resonance circuit includes an input line, a first resonance portion acting as an extracted pole unit (EPU) for attenuation in the non-pass band, and a second resonance portion coupled with the input line and radiating element, allowing for a simple structure that defines the pass band and forms an attenuation pole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a filter is integrated with an antenna in a dielectric substrate, then the antenna device is miniaturized and antenna characteristics are improved, but the filter size cannot be sufficiently reduced for dual polarization applications
Solution Approach 1:
The filter is divided into two independent resonance circuits, each handling one polarization. Each resonance circuit includes resonators arranged in a specific pattern that allows independent filtering for first and second polarizations while sharing the same radiating element structure
Solution Approach 2:
A single radiating element structure serves multiple functions by supporting both first and second polarizations. The resonators are configured to extract signals for different polarizations from the same radiating element, eliminating the need for separate antenna structures for each polarization
2Reliability
If filter characteristics are improved by increasing attenuation in non-pass band and steepness in pass band, then filter performance is enhanced, but filter complexity and size increase
Solution Approach 1:
Different regions of the filter structure are assigned different functions: resonators are positioned to provide strong attenuation in specific non-pass band frequency regions, while the pass band region maintains steep characteristics through the coupling arrangement between resonators and the radiating element
Solution Approach 2:
The filter utilizes electromagnetic resonance phenomena where resonators are tuned to specific frequencies to create stop bands through resonant absorption. The resonators vibrate at their resonant frequencies to attenuate signals in non-pass bands, achieving high attenuation without complex structures
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 configuration enables miniaturization and improved filter characteristics by defining the pass band with a relatively simple structure and forming an attenuation pole in the non-pass band, reducing the overall size of the filter device while maintaining desired attenuation characteristics.
Implementation Method 1
a first resonance portion that is coupled with the input line; and a second resonance portion that is coupled with the input line and the radiating element. The first resonance portion functions as an extracted pole unit (EPU) generating an attenuation pole
Data Source
AI summary
An antenna module includes a dielectric substrate, a radiating element that is arranged in the dielectric substrate, ground electrodes that are arranged to be opposed to the radiating element, and a resonance circuit. The resonance circuit is arranged between the radiating element and the ground electrode and includes resonators. The radiating element and the resonance circuit constitute a filter device. The resonance circuit includes an input line that receives a radio frequency signal from an RFIC, a resonance portion that is coupled with the input line, and a resonance portion that is coupled with the input line and the radiating element. The ground electrode is arranged between the radiating element and the input line. The resonance portion functions as an extracted pole unit. The input line is arranged between the resonance portion and the resonance portion.