Filter Antenna Stacked Cavity Miniaturization
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Solution Overview
Problem
Current antenna technologies face challenges in achieving miniaturization while maintaining performance, particularly in the millimeter wave band for 5G applications, due to severe spatial loss of electromagnetic waves and the need for phased array architectures.
Innovation Solution
A filter antenna device is designed with a stacked resonant cavity structure, incorporating a microstrip patch antenna, coplanar waveguide feed structure, and LTCC dielectric substrates, which enables miniaturization while ensuring high antenna performance through efficient coupling and electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a phased array architecture is adopted to achieve high gain beam and spatial scanning in millimeter wave band, then the data transmission rate is improved, but the antenna structure becomes more complex and larger in size
Solution Approach 1:
The patent combines the antenna and filter into a single integrated structure where the resonant cavity serves both as the filtering element and the antenna radiating structure. The patch antenna is directly formed on the resonant cavity, eliminating the need for separate filter and antenna components, thus reducing structural complexity while maintaining millimeter wave performance
Solution Approach 2:
The resonant cavity structure performs multiple functions simultaneously: it acts as a band-pass filter to select millimeter wave frequencies, serves as the antenna radiating element for high gain beam formation, and provides phase shifting capability for spatial scanning. This multi-functional design reduces the overall system complexity
2Volume of moving object
If component integration is pursued to achieve miniaturization, then the device size is reduced, but the antenna performance may be compromised
Solution Approach 1:
The patent embeds the patch antenna within the resonant cavity structure, with the antenna formed on the cavity's upper surface. The feed structure is nested within the cavity, and the entire assembly is integrated into a compact multi-layer configuration using LTCC technology, achieving miniaturization without sacrificing performance
Solution Approach 2:
The patent utilizes three-dimensional resonant cavity structures and multi-layer LTCC construction to achieve compact integration. By transitioning from planar to volumetric design, the antenna achieves miniaturization while maintaining the necessary electromagnetic performance through optimized cavity dimensions and feed structures
3Speed
If millimeter wave frequency is used to achieve high data transmission rate, then the bandwidth is increased, but the spatial loss of electromagnetic waves increases
Solution Approach 1:
The patent optimizes the resonant cavity dimensions, patch antenna size, and feed structure parameters to maximize electromagnetic coupling efficiency and minimize spatial loss. By carefully tuning the cavity resonant frequency and Q-factor, the system achieves efficient millimeter wave transmission with reduced energy loss
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 achieves a miniaturized design with improved antenna performance, including a reflection coefficient of less than 10 dB and out-of-band rejection of not less than 20 dB, effectively suppressing interference and enhancing overall antenna efficiency.
Implementation Method 1
a first resonant cavity and a second resonant cavity which are stacked from top to bottom and in coupling communication
Implementation Method 2
a feed structure provided in the second resonant cavity
Implementation Method 3
LTCC dielectric substrates
Data Source
AI summary
The present invention provides a filter antenna including a first resonant cavity and a second resonant cavity which are stacked from top to bottom and in coupling communication with each other, an antenna unit provided on a side of the first resonant cavity facing away from the second resonant cavity, and a feed structure provided in the second resonant cavity. The present invention integrates a filter with an antenna to ensure the performance of the filter antenna by using a SIW cavity filter, thereby effectively suppressing interference from out-of-band spurious signals. In addition, the stacking structure of the antenna and the filter effectively reduces a volume to achieve miniaturization, and the antenna structure is optimized in a compact environment.