Resonant Antenna Array Layout for Multi-Band Isolation
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Solution Overview
Problem
Conventional antenna devices face challenges with structural and manufacturing complexities, high integration costs, and interference between multiple frequency bands, necessitating improved isolation and reduced coupling, while also eliminating the need for additional components like duplexers.
Innovation Solution
An antenna device with a radiator and resonant structure configured to operate in multiple frequency bands without a duplexer, utilizing a resonant structure in the reactive near field to minimize coupling and enhance directivity, and an array of such devices allowing bi-directional communication without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antenna arrays are integrated in the same enclosure to cover different frequency bands, then the antenna system can service all applicable frequency bands, but the coupling between antenna elements increases and degrades signal quality
Solution Approach 1:
A resonant structure is introduced as an intermediary element between the first and second antenna arrays. This resonant structure is tuned to resonate at frequencies corresponding to the second frequency band, creating a null in the radiation pattern of the first antenna array at these frequencies. This intermediary structure effectively isolates the two antenna arrays from each other, reducing coupling and allowing both arrays to operate simultaneously without interference.
2Reliability
If a duplexer is added to separate TX and RX signal paths, then transmission and receiving signals can be isolated, but the physical footprint and device complexity increase
Solution Approach 1:
The duplexer function is extracted and replaced by the resonant structure's natural resonance properties. Instead of using a separate duplexer device to isolate TX and RX signals, the resonant structure itself creates frequency-selective isolation through its resonance null, eliminating the need for additional duplexer components while maintaining signal isolation.
Solution Approach 2:
The resonant structure serves multiple functions simultaneously: it acts as a parasitic element for the first antenna array, creates a radiation null to reduce coupling, provides frequency-selective isolation, and enables both TX and RX operations without requiring a separate duplexer. This multi-functionality reduces overall device complexity while maintaining reliability.
3Area of stationary object
If antenna arrays are closely spaced to reduce form factor, then the antenna system becomes more compact, but the coupling between adjacent antennas increases
Solution Approach 1:
The resonant structure is positioned between closely spaced antenna arrays as a mediator that enables compact integration. By tuning the resonant structure to resonate at the frequency band of the second antenna array, it creates a radiation null that prevents coupling to the first antenna array, allowing the antennas to be closely spaced without increasing coupling.
4Object-affected harmful factors
If resonant structures are used to detune antenna in desired frequency bands, then coupling with adjacent antennas is reduced, but the antenna system complexity increases
Solution Approach 1:
The resonant structure is merged with the existing antenna array structure rather than being added as a separate component. The resonant structure serves as a parasitic element that is electrically connected to the first antenna array, combining the radiation and detuning functions into a unified structure. This integration minimizes additional complexity while achieving effective coupling reduction.
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 results in a compact, low-profile antenna system with reduced complexity, lower installation effort, and improved performance by minimizing coupling and eliminating the need for duplexers, while maintaining high directivity and enabling efficient operation across multiple frequency bands.
Implementation Method 1
the resonant structure is configured to have a resonant frequency within the first frequency band
Implementation Method 2
a radiator configured to radiate an electromagnetic signal in a direction parallel to a radiating axis of the antenna device
Data Source
AI summary
An antenna device, an array of antenna devices, and a base station having an antenna device. A radiator is configured to radiate an electromagnetic signal in a direction parallel to a radiating axis of the antenna device. The radiator has a substantially planar shape perpendicular to the radiating axis and a resonant structure adjacent to the radiator. The resonant structure has a substantially planar shape parallel to the radiator, wherein the radiator is configured to radiate the electromagnetic signal in a first frequency band and the resonant structure is configured to have a resonant frequency within the first frequency band.