MIMO Antenna With Origami Folded Element For Broadband Isolation
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Solution Overview
Problem
Current MIMO antennas lack broadband performance and effective isolation between radiating elements, limiting their frequency range and operational efficiency.
Innovation Solution
The design incorporates an origami-like folded element with specific structural features, including a λ/4 electrical distance between feeding and grounding regions, additional coupling portions, and a conductive isolation element, mounted on a radome with sculpted edges, to enhance radiation in both low-frequency (698 - 960 MHz) and high-frequency (1710 - 2700 MHz) ranges, while maintaining spatial diversity and improving Voltage Standing Wave Ratio (VSWR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MIMO antenna designs are used, then the antenna structure is simple, but broadband performance and isolation between radiating elements are insufficient
Solution Approach 1:
The antenna is divided into two independent radiating elements (first and second radiating elements) with separate feed networks. Each element has its own feeding conductor and ground connection, allowing independent optimization and reducing mutual coupling. The isolation element further segments the electromagnetic fields between elements.
Solution Approach 2:
An isolation element is introduced as an intermediary component between the two radiating elements. This element acts as a mediator to reduce mutual coupling and improve isolation by manipulating the electromagnetic fields in the space between elements without requiring direct modification of the elements themselves.
2Adaptability or versatility
If conventional MIMO antenna designs are used, then the manufacturing process is simple, but broadband performance across multiple frequency ranges is limited
Solution Approach 1:
The antenna design achieves multi-functionality by enabling operation across multiple frequency ranges (low-frequency range and high-frequency range) with a single antenna structure. The radiating elements and feeding networks are designed to support both frequency bands simultaneously, eliminating the need for separate antennas for different bands.
Solution Approach 2:
The antenna utilizes parameter changes in the feeding conductors and radiating element dimensions to achieve broadband performance. By carefully controlling electrical lengths, impedance transformations, and geometric parameters, the antenna maintains good VSWR and radiation characteristics across both low and high frequency ranges.
3Reliability
If additional isolation elements and coupling portions are added, then isolation and VSWR improve, but device complexity increases
Solution Approach 1:
The feeding conductors are designed to perform multiple functions simultaneously: they provide impedance transformation, connect to the radiating elements, and incorporate coupling portions that interact with the ground plane for additional impedance control. This merging of functions reduces the need for separate components.
Solution Approach 2:
The coupling portions serve dual purposes: they provide additional impedance control for VSWR optimization and simultaneously act as isolation mechanisms by creating controlled electromagnetic interactions with the ground plane. This multi-functionality reduces the need for separate isolation components.
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 antenna achieves broadband performance with improved isolation and VSWR across the specified frequency ranges, offering enhanced spatial diversity and efficiency compared to conventional MIMO antennas.
Implementation Method 1
the first coupling portion being capacitively coupled to the ground plane
Implementation Method 2
an isolation element for electrically isolating between the first and second radiating elements
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An antenna, including a ground plane, a first radiating element mounted on the ground plane, a second radiating element mounted on the ground plane in spaced relation to the first radiating element, each one of the first and second radiating elements including a feed leg for feeding the radiating element, a ground leg for grounding the radiating element, an origami-like folded element having a first end and a second end, the first end being connected to the feed leg, the second end being capacitively coupled to the radiating element and a supplementary ground connection extending between the feed leg and the ground plane.