Slot Antenna Array Phase Shift for 5G Metal Casing Interference
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Solution Overview
Problem
Existing 5G communication system antennas face challenges in efficiently radiating signals in a desired direction, especially in mobile devices with metal casings, due to electromagnetic interference and limited scanning range, which affects communication performance.
Innovation Solution
A wireless communication device with a dielectric substrate and metal layer featuring a slot antenna array, where slot elements of different lengths are arranged to provide a phase shift, allowing effective radiation in the end-fire direction and reducing back radiation, thus enhancing scanning range and communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna is used in a mobile device with a metal case, then the device structure is simple, but electromagnetic radiation is distorted by the metal case causing poor signal reception
Solution Approach 1:
A dielectric substrate is introduced as an intermediary layer between the antenna and the metal case. This dielectric layer acts as a mediator that prevents direct electromagnetic interaction between the antenna and the conductive metal case, thereby reducing signal distortion and interference while allowing the metal case structure to be maintained.
2Reliability
If a slot antenna array with elements of different lengths is used, then directional radiation performance is improved, but the device complexity increases
Solution Approach 1:
The antenna is divided into multiple slot elements of different lengths arranged in an array configuration. Each slot element contributes to the overall radiation pattern, and by segmenting the antenna into these discrete elements with varying dimensions, directional radiation performance is achieved through constructive and destructive interference patterns.
Solution Approach 2:
Different slot elements in the array have different lengths, creating local variations in electromagnetic properties. This local quality differentiation allows each element to contribute differently to the overall radiation pattern, enabling beamforming and directional control without requiring complex external components.
3Adaptability or versatility
If the scanning range is increased to cover +/−75 degrees, then communication coverage is improved, but the antenna design complexity increases
Solution Approach 1:
The slot antenna array is designed with adjustable phase and amplitude characteristics that allow dynamic beam steering across a wide scanning range of +/−75 degrees. By dynamically controlling the excitation parameters of different slot elements, the radiation beam can be steered to cover extensive angular ranges without mechanical movement.
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 provides reliable signal reception, high gain, reduced reflection loss, and improved scanning range of up to +/−75 degrees, effectively overcoming the limitations of metal casing interference and enhancing directional properties.
Implementation Method 1
slot antenna array including multiple first slot elements having a first length and multiple second slot elements having a second length longer than the first length
Implementation Method 2
slot elements of different lengths are arranged to provide a phase shift, allowing effective radiation in the end-fire direction and reducing back radiation
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate than a 4G system, such as LTE. Various embodiments of the present disclosure provide a device and a method. To this end, an antenna unit may comprise a dielectric substrate, a dielectric cover on the dielectric substrate, and a slot antenna array formed in a metal layer arranged on or in the dielectric substrate. The slot antenna array may be configured to generate a traveling wave which propagates in the dielectric substrate and the dielectric cover, and may have at least two groups (first and second groups) of slot elements. Each slot element of the second group may be shorter than any slot element of the first group, and slots of the first and second groups may be arranged to be opposite to each other so as to make pairs of slot elements. In a pair of slot elements, the distance from the slot element of the first group to the slot element of the second group may be selected such that a phase shift is provided between 90 degree radiation waves thereof. The pairs of slot elements may be arranged out of alignment such that even-numbered pairs of slot elements are offset from odd-numbered pairs of slot elements.