Slot Antenna in Mobile Terminal Metal Shell
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Solution Overview
Problem
Existing antennas for mobile terminals with metal shells, such as planar inverted-F, inverted-F, unipolar, and loop antennas, are inefficient in sending or receiving electromagnetic signals.
Innovation Solution
An antenna device comprising a slot in the mobile terminal's shell, a connecting assembly, a first capacitor, a first match circuit, and a second match circuit, which forms a slot antenna that couples with the mainboard to efficiently transmit signals through the slot, allowing for effective communication across various frequency ranges including 2.4-2.48 GHz for WIFI and 1.5-1.6 GHz for GPS, and 5.1-5.85 GHz for 5G WIFI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal shell is used for the mobile terminal, then the appearance and wear-resistance are improved, but the antenna efficiency in sending or receiving electromagnetic signals deteriorates
Solution Approach 1:
The metal shell is segmented by defining a slot that divides it into a first part and a second part. The first part forms a slot antenna structure that can radiate electromagnetic signals, while the second part maintains the protective function. This segmentation allows the metal shell to retain its wear-resistance while enabling effective antenna operation through the slot structure.
Solution Approach 2:
A connecting assembly is introduced as an intermediary component to connect the first part and the second part of the shell. This connecting assembly provides an electrical connection path that enables the slot antenna to function properly while maintaining the structural integrity and protective function of the metal shell. The intermediary component resolves the conflict between the shell's protective function and the antenna's radiation function.
2Device complexity
If conventional antennas (PIFA, IFA, unipolar, loop) are used in a mobile terminal with metal shell, then the device structure is simple, but the electromagnetic signal transmission efficiency deteriorates
Solution Approach 1:
The slot in the metal shell serves multiple functions: it acts as the radiating element of the slot antenna, maintains the metal shell's protective function, and provides structural integration. By making the slot multi-functional, the design achieves effective electromagnetic signal transmission without adding complex separate antenna structures, thus maintaining simplicity while improving reliability.
Solution Approach 2:
The slot antenna parameters (such as slot dimensions, position, and shape) are optimized to achieve resonance at the required operating frequencies. By adjusting these parameters, the slot structure can efficiently radiate electromagnetic signals across different frequency bands while maintaining integration with the metal shell, thus improving signal transmission efficiency without significantly increasing device complexity.
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
Ensures efficient radiation and reception of electromagnetic signals even with a metal shell, enabling the realization of 2.4G WIFI/GPS and 5G WIFI antennas separately, enhancing communication signal intensity.
Implementation Method 1
The first part is configured to couple with a mainboard via a first feeding point to form a slot antenna... The antenna is configured to send a signal through the slot
Implementation Method 2
The first capacitor couples the first part and the first feeding point
Data Source
AI summary
An antenna device includes a slot, a connecting assembly, a first capacitor, a first match circuit, an antenna and a second match circuit. The slot is defined in a shell of the mobile terminal. The slot separates the shell into a first part and a second part. The first part is configured to couple with a mainboard via a first feeding point to form a slot antenna. The connecting assembly connects the first part with the second part. The first capacitor couples the first part and the first feeding point. The first match circuit couples the first capacitor and the first feeding point. The antenna is configured to send a signal through the slot. The antenna is disposed above the mainboard and below the slot and the antenna couples with the mainboard via a second feeding point.