Integrated Antenna Assembly for 2.4 GHz Wireless Networks
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Solution Overview
Problem
Existing antenna assemblies in multi-mode devices face challenges in achieving efficient and consistent performance across multiple wireless networks, particularly in the 2.4 GHz frequency spectrum, with limitations in return loss and radiation patterns.
Innovation Solution
An integrated antenna assembly is designed as a computer expansion card with a planar inverted F antenna (PIFA) structure, comprising a radiating element and a ground plane on a motherboard, optimized for resonance frequency at 2.5 GHz and impedance matching, providing a near-uniform, omni-directional radiation pattern and low return loss across the 2.4 GHz ISM band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional antenna assemblies are used in multi-mode devices, then device cost and size are reduced through hardware sharing, but performance consistency and efficiency across multiple wireless networks deteriorate
Solution Approach 1:
The patent applies local quality by creating a dedicated antenna assembly with optimized radiating elements specifically designed for 2.4 GHz ISM band performance. The antenna assembly includes a ground plane, radiating elements with specific geometries, and impedance matching components tailored for WiFi and Bluetooth networks, ensuring consistent performance across multiple wireless standards without compromising other device functions.
Solution Approach 2:
The antenna assembly achieves universality by designing a multi-functional structure that supports both WiFi and Bluetooth networks simultaneously. The radiating elements are configured to operate across the 2.4 GHz spectrum used by both standards, and the impedance matching network is designed to accommodate varying load conditions from different wireless protocols, enabling a single assembly to serve multiple communication modes effectively.
2Loss of energy
If antenna assembly is optimized for resonance at 2.5 GHz, then efficiency and gain are improved, but bandwidth coverage and impedance matching across the entire 2.4 GHz ISM band may deteriorate
Solution Approach 1:
The patent applies dynamics by implementing an adjustable impedance matching network that can adapt to different operating conditions and frequency points within the 2.4 GHz band. The matching network includes variable capacitors and inductors that can be tuned to maintain optimal impedance matching across the entire ISM band, allowing the antenna to maintain high efficiency at 2.5 GHz resonance while also covering the full bandwidth required for WiFi and Bluetooth operations.
Solution Approach 2:
The antenna assembly utilizes parameter changes by varying the geometric parameters of the radiating elements, such as length, width, and positioning, to create multiple resonant modes. The impedance matching network also employs variable electrical parameters (capacitance and inductance values) to broaden the operational bandwidth. These parameter adjustments enable the antenna to maintain high efficiency at the 2.5 GHz resonance point while extending coverage across the entire 2.4 GHz ISM band.
3Ease of manufacture
If integrated antenna assembly is designed with planar inverted F structure, then manufacturing complexity is reduced, but radiation pattern uniformity and return loss performance may deteriorate
Solution Approach 1:
The patent applies asymmetry by designing radiating elements with non-uniform geometries and asymmetric positioning relative to the ground plane. This asymmetric configuration allows control over the radiation pattern to achieve near-uniform omnidirectional coverage. The impedance matching network also employs asymmetric component placement and values to optimize return loss performance across different polarization directions, maintaining manufacturing simplicity while achieving precise radiation characteristics.
4Volume of moving object
If antenna assembly components are minimized for compact size, then device form factor is improved, but return loss and gain performance across the frequency spectrum may deteriorate
Solution Approach 1:
The patent applies the nested doll principle by integrating the impedance matching network components within the existing antenna assembly structure. The matching network components are positioned in the spaces between and around the radiating elements, utilizing the available volume efficiently. This nested arrangement maintains a compact overall form factor while incorporating all necessary components for consistent frequency response and return loss performance across the 2.4 GHz spectrum.
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 integrated antenna assembly achieves high efficiency and consistent gain across the 2.35 GHz to 2.6 GHz frequency spectrum, suitable for both WiFi and Bluetooth networks, with improved return loss and radiation patterns, enhancing wireless communication capabilities in multi-mode devices.
Implementation Method 1
optimized for resonance frequency at 2.5 GHz
Implementation Method 2
providing a near-uniform, omni-directional radiation pattern
Data Source
AI summary
An antenna assembly comprises a computer expansion card comprising a metallic layer which forms a radiating element or a metallic shield which forms the radiating element and a feed line coupled to the radiating element. Other embodiments may be described.