Wave Trap Antenna Layout for Compact Multi-Band Isolation
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Solution Overview
Problem
In user equipment such as mobile phones, the physical space constraints limit the effective isolation between different frequency band antennas, leading to performance issues due to power dissipation between Low Band and Middle-High Band frequency antennas.
Innovation Solution
An antenna arrangement where a wave trap is connected to the Low Band frequency antenna element, creating a high-impedance interface and improving isolation without requiring additional space, by being integrated with existing constructional elements and using galvanic or capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If different antenna elements are arranged close together within the housing to satisfy space restrictions, then the device fits within space constraints, but isolation between antenna elements deteriorates leading to power dissipation
Solution Approach 1:
A wave trap structure is introduced as an intermediary element between the first and second antenna elements. This wave trap creates a high-impedance interface that blocks electromagnetic coupling between the antennas, preventing power dissipation while allowing the antennas to remain in close proximity within the housing.
Solution Approach 2:
The wave trap structure changes the impedance parameter in the space between the antenna elements. By creating a high-impedance region at specific frequencies, the wave trap prevents energy transfer between antennas operating at different frequency bands, thereby reducing power dissipation while maintaining compact arrangement.
2Loss of energy
If a wave trap is connected to a ground system to improve isolation, then isolation between antenna elements improves, but additional space is required
Solution Approach 1:
The wave trap structure is merged with existing constructional elements of the user equipment, such as the housing or internal support structures. By utilizing already-present structural components, the wave trap achieves its isolation function without requiring additional dedicated space for ground systems or separate isolation structures.
Solution Approach 2:
The wave trap structure serves multiple functions: it provides electromagnetic isolation between antenna elements, maintains structural integrity of the housing, and utilizes existing structural components. This multi-functionality eliminates the need for separate ground systems and reduces overall space requirements.
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 enhances the performance of Middle-High Band frequency antennas by reducing power dissipation and improving isolation, allowing for more efficient radio communication within limited space.
Implementation Method 1
a wave trap configured to resonate within a frequency band above the limit frequency
Implementation Method 2
a high-impedance is created in a space with a short-circuited, quarter-wavelength-long transmission line
Data Source
Figure 1~3
Figure 4~5b
Figure 6(a)~6(b)
AI summary
Herein an antenna arrangement (2) for a user equipment is disclosed. The antenna arrangement (2) comprises a first antenna element (4) configured to operate at frequencies above a limit frequency, a second antenna element (6) configured to operate at frequencies below the limit frequency, and a wave trap (8) configured to resonate within a frequency band above the limit frequency. The wave trap (8) is connected to the second antenna element (6).