Antenna Design for Multi-Band Portable Devices
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Solution Overview
Problem
Portable devices face challenges in accommodating multiple antennas for multi-band communication within limited space, leading to interference and reduced antenna allocation space, as they transition from 3G to 4G LTE communication methods.
Innovation Solution
The design incorporates a main antenna and an auxiliary antenna with distinct radiation principles and structures, where the auxiliary antenna uses capacitors to determine its resonant frequency, minimizing interference and allowing for efficient multi-band operation within a small space by utilizing a printed circuit board with cut-out areas and a metal surface as a ground surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are added for multi-band communication, then communication capability is improved, but antenna allocation space is reduced
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated antenna structure that supports both telephony and data communication across multiple frequency bands (2G, 3G, 4G, WiFi, Bluetooth), eliminating the need for separate antennas for each function and frequency band
Solution Approach 2:
The integrated antenna is designed to perform multiple functions simultaneously - supporting various communication protocols (GSM, WCDMA, LTE, WiFi, Bluetooth) and frequency bands through a single antenna element, making it a universal communication interface
2Adaptability or versatility
If multiple antennas are mounted in the portable device, then multi-band communication is enabled, but interference between antennas occurs
Solution Approach 1:
The patent strategically positions the integrated antenna near the device edge where it can utilize the device housing as a ground plane, converting what would normally be interference from nearby metal surfaces into a beneficial grounding effect that improves antenna performance and reduces interference
Solution Approach 2:
The device housing acts as an intermediary ground plane between the antenna and internal electronics, providing electrical isolation and reducing interference while maintaining the antenna's proximity to the housing for optimal performance
3Volume of moving object
If antenna size is reduced to fit limited space, then portability is improved, but antenna performance is degraded
Solution Approach 1:
The patent transitions from planar antenna designs to a three-dimensional integrated antenna structure that utilizes vertical space and device thickness, allowing the antenna to achieve full performance characteristics without increasing the device's footprint area
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
This configuration enables effective multi-band operation with reduced spatial constraints, minimizing interference and allowing for efficient use of space, while allowing for tuning of resonant frequencies through capacitance adjustments, enhancing the performance of portable devices.
Implementation Method 1
a first group of three capacitors connected in series; wherein a first side of the first group of three capacitors connected in series is connected to the second end of the radiating element and a second side of the first group of three capacitors connected in series is connected to the ground surface; wherein the capacitance and physical structure of the first group of three series connected capacitors is configured to determine the resonance frequency band of the auxiliary antenna
Implementation Method 2
the capacitance and physical structure of the first group of three series connected capacitors is configured to determine the resonance frequency band of the auxiliary antenna
Data Source
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AI summary
An antenna apparatus and a portable device having the same are provided. The antenna apparatus includes a main antenna having a first radiator pattern, and an auxiliary antenna separated from the main antenna by a metal surface adjacent to the main antenna. The auxiliary antenna is resonant at a resonant frequency which is a function of at least one capacitor provided in a cut-out area of a printed circuit board (PCB) adjacent to the metal surface