Multilayer Antenna Module Cavity Layout for Wider Bandwidth
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Solution Overview
Problem
The challenge is to maintain a broad frequency band width for antenna modules in mobile devices without increasing their size, as thinner dielectric substrates lead to narrower frequency bands due to stronger electromagnetic-field coupling.
Innovation Solution
Incorporating a hollow portion between the radiation electrodes in a multilayer dielectric substrate reduces the effective permittivity, thereby weakening electromagnetic-field coupling and expanding the frequency band width without increasing the antenna module's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric substrate is made thinner to reduce the antenna module size, then the antenna module becomes more compact, but the frequency band width becomes narrower
Solution Approach 1:
The patent introduces a hollow portion (air cavity) within the dielectric substrate between the first and second radiation electrodes. This creates a porous or cavity-containing structure that reduces the effective permittivity of the dielectric material, thereby weakening the electromagnetic-field coupling and expanding the frequency band width without increasing the overall antenna module thickness.
2Adaptability or versatility
If the dielectric substrate thickness is increased to broaden the frequency band, then the frequency band width increases, but the antenna module size increases
Solution Approach 1:
The patent applies local quality by creating a hollow portion at a specific location within the dielectric substrate (between the radiation electrodes) rather than uniformly changing the entire substrate structure. This localized modification reduces the effective permittivity in the critical region where electromagnetic coupling occurs, broadening the frequency band without requiring an overall increase in substrate thickness or module size.
3Power
If the electromagnetic-field coupling is strengthened to improve antenna performance, then the antenna gain improves, but the frequency band width becomes narrower
Solution Approach 1:
The patent changes the effective permittivity parameter of the dielectric substrate by introducing a hollow portion. This parameter change reduces the electromagnetic-field coupling strength, which broadens the frequency band width while maintaining acceptable antenna gain performance through the optimized configuration of radiation electrodes and the hollow portion.
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 enhances the frequency band width and efficiency of the antenna module by reducing electric energy loss, while maintaining a compact form factor.
Implementation Method 1
permittivity of a dielectric substrate on which antenna elements (radiation electrodes) are implemented has an effect on its antenna characteristics... the frequency band width typically increases with the increase in the thickness of the dielectric substrate (that is, the distance between a radiation electrode and a ground electrode and the distance between radiation electrodes)
Implementation Method 2
In the dielectric substrate, a hollow portion is disposed in at least a portion between the first radiation electrode and the second radiation electrode... the effective permittivity between the two radiation electrodes is reduced
Data Source
AI summary
An antenna module (100) includes a dielectric substrate (160) having a multilayer structure, a first radiation electrode (122), a second radiation electrode (121), and a ground electrode (GND). The second radiation electrode (121) is arranged between the first radiation electrode (122) and the ground electrode (GND) in a lamination direction of the dielectric substrate (160). In the dielectric substrate (160), a hollow portion (150) is disposed in at least a portion between the first radiation electrode (122) and the second radiation electrode (121).