Shared-Aperture Antenna Filtering Unit for Inter-Band Interference
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Solution Overview
Problem
Existing shared-aperture antennas face interference issues between high-frequency and low-frequency radiation units, leading to radiation pattern distortion and inadequate integration of wave transmission and filtering functions.
Innovation Solution
A wide-band wave-transmitting/filtering radiation unit with a radiation structure and feed structure, incorporating a radiator with multiple layers of surface periodic structures, forms a non-resonant node spatial band-pass filter circuit and equivalent filtering circuit to mitigate interference and enhance antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If high-frequency antenna radiation units are arranged around low-frequency radiation units to reduce antenna surface area, then the antenna size is reduced, but interference between high-frequency and low-frequency radiation units becomes more severe
Solution Approach 1:
The patent introduces a wave transmission and filtering unit as an intermediary component between high-frequency and low-frequency radiation units. This unit selectively transmits high-frequency waves while filtering out interfering signals, enabling close arrangement of radiation units without severe interference. The filtering unit acts as a mediator that allows beneficial high-frequency transmission while blocking harmful interference signals.
Solution Approach 2:
The wave transmission and filtering unit performs multiple functions simultaneously: it transmits high-frequency electromagnetic waves, filters out interfering signals, and maintains radiation pattern integrity. By integrating these multiple functions into a single component, the patent enables compact antenna design without sacrificing performance or incurring additional complexity from separate filtering circuits.
2Object-affected harmful factors
If additional filter circuits are employed to address self-radiation interference, then interference is mitigated, but device complexity increases
Solution Approach 1:
The patent merges the wave transmission function and filtering function into a single integrated wave transmission and filtering unit. This unified structure eliminates the need for separate additional filter circuits, reducing device complexity while effectively addressing self-radiation interference. The filtering capability is embedded within the radiation surface structure itself rather than being added as a separate component.
3Reliability
If low-frequency radiation units are made capable of transmitting electromagnetic waves to mitigate inter-radiation interference, then radiation pattern distortion is improved, but wave transmission and filtering functions remain separate
Solution Approach 1:
The wave transmission and filtering unit is designed to simultaneously perform wave transmission and filtering functions. It allows low-frequency radiation units to transmit electromagnetic waves for mitigating inter-radiation interference while also providing filtering capabilities to suppress unwanted signals. This multi-functional integration eliminates the need for separate filtering circuits and simplifies the overall antenna structure.
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 effectively improves radiation pattern distortion, enhances antenna gain, and widens the standing wave bandwidth while maintaining good wave-transmitting performance.
Implementation Method 1
the radiator and the plurality of layers of surface periodic structures on the radiation structure collectively form a non-resonant node spatial band-pass filtering circuit with K resonant points and K null points
Implementation Method 2
units of the plurality of layers of surface periodic structures are excited by the radiator in a parallel manner to form an equivalent filtering circuit
Data Source
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AI summary
A wide-band wave-transmitting/filtering radiation unit, a shared-aperture antenna array, and a communication device are disclosed. The radiation unit includes a radiation structure and a feed structure, where the radiation structure and the feed structure are coupled for feeding, so that the radiation structure radiates low-frequency electromagnetic wave signals outward; the radiation structure includes a radiator, and the radiator is loaded with a plurality of layers of surface periodic structures; when the radiation structure operates in a first mode, electromagnetic waves excited by a high-frequency radiation unit irradiates the radiation structure, and the radiator and the plurality of layers of surface periodic structures collectively form a non-resonant node spatial band-pass filter circuit with K resonant points and K null points; and when the radiation structure operates in a second mode, low-frequency electromagnetic waves excite the radiation structure by means of the feed structure, and units of the plurality of layers of surface periodic structures are excited by the radiator in a parallel manner to form an equivalent filter circuit. The present disclosure can improve radiation pattern distortion of a multi-band antenna, and enhance indexes such as antenna gain, out-of-band suppression, and a cross-polarization ratio.