Millimeter Wave Filtering Antenna Parasitic Patch Integration
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Solution Overview
Problem
Existing millimeter wave filtering antennas face challenges in integrating filters with RF chips due to high interconnection losses, and traditional filtering methods either require high Q-value filters or additional circuits, which increase design complexity and cost.
Innovation Solution
A millimeter wave filtering antenna design incorporating a parasitic unit with nested quadrilateral and cross-shaped parasitic patches, a feeding unit with short-circuit patches, and a differential feeding network, which achieves filtering performance with high roll-off and isolation without additional insertion loss, using a compact multi-layer PCB structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is packaged separately from the antenna and chip, then the Q value requirement is reduced, but interconnection losses increase significantly in the millimeter wave frequency band
Solution Approach 1:
The patent combines the filter and antenna into a single integrated structure where the parasitic patch serves dual functions as both the radiating element and the filtering component. This merging eliminates separate interconnections between filter and antenna, thereby reducing interconnection losses in the millimeter wave frequency band while maintaining the required Q value through the resonant characteristics of the integrated structure.
2Reliability
If filtering is achieved by traditional methods such as cutting slots or placing parasitic elements, then filtering performance is improved, but design complexity and additional circuits are required
Solution Approach 1:
The parasitic patch in the patent serves multiple functions simultaneously: it acts as the radiating element for the antenna, provides filtering through its resonant characteristics, and enables bandwidth control. This multi-functionality eliminates the need for separate filtering circuits or additional parasitic elements, thereby reducing design complexity while achieving high filtering performance with sharp roll-off and good isolation.
Solution Approach 2:
The patent employs a nested structure where the parasitic patch is positioned closely coupled to the feeding patch, with the short-circuit patch nested within the feeding patch structure. This nested arrangement achieves complex filtering characteristics through compact geometric configurations rather than requiring additional separate components, thereby simplifying the overall design while maintaining high filtering performance.
3Volume of moving object
If the antenna profile is reduced for compact packaging, then integration with RF chip is improved, but radiation performance may be compromised
Solution Approach 1:
The patent achieves low profile while maintaining radiation performance by optimizing the dimensional parameters of the parasitic patch, including its length, width, and position relative to the feeding patch. By carefully adjusting these parameters, the resonant frequency and radiation characteristics are tuned to achieve high gain and stable radiation patterns despite the compact size, thereby resolving the contradiction between reduced profile and maintained radiation performance.
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 solution provides low-profile, wide-band, high-gain filtering with stable radiation patterns and low insertion loss, enabling cost-effective and integrated RF systems with improved filtering performance and reduced design complexity.
Implementation Method 1
The parasitic unit includes at least one quadrilateral parasitic patch and at least one cross shaped parasitic patch, both the at least one quadrilateral parasitic patch and the at least one cross shaped parasitic patch are nested and combined with each other. The feeding unit includes one feeding patch, and a periphery of the feeding patch is loaded with a short-circuit patch to form coupling.
Implementation Method 2
radiation suppression effect can be realized by a resonant unit nested in a microstrip feeding line
Data Source
AI summary
A millimeter wave filtering antenna and a wireless communication device are disclosed. The millimeter wave filtering antenna includes a parasitic unit, a feeding unit and a feeding network. The parasitic unit includes at least one quadrilateral parasitic patch and at least one cross shaped parasitic patch, both of which are nested and combined with each other. The feeding unit includes a feeding patch, and the feeding patch is loaded with a short-circuit patch to form coupling. The feeding network feeds the feeding unit. The wireless communication device includes a millimeter wave filtering antenna according to the present disclosure. The radiation performance of the antenna can not only realize the filtering characteristics with high roll-off and high isolation, but also ensure that no additional insertion loss is introduced.