Antenna Module Capacitive Coupling LTE-700 Bandwidth
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Solution Overview
Problem
Conventional printed inverted-F antennas have a poor low frequency bandwidth that fails to adequately cover the LTE-700 frequency band and are unsuitable for LTE carrier aggregation requirements, as they need to switch resonant modes across different frequency bands.
Innovation Solution
The design of a wireless communication apparatus with an antenna module that includes two antennas on opposite surfaces of an electrical insulation cover, utilizing capacitive coupling to generate multiple resonant modes without the need for a switch, allowing the antennas to cover different frequency bands, including LTE-700, by increasing their electrical lengths and using slits to optimize coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is designed to switch the resonant path of the antenna, then the antenna can cover the LTE-700 frequency band, but the device complexity increases and the antenna cannot satisfy LTE-CA requirements for simultaneous multi-frequency operation
Solution Approach 1:
The antenna is divided into multiple independent resonant paths, each capable of operating at different frequency bands. The first resonant path includes a first resonant element and first coupling element, while the second resonant path includes a second resonant element and second coupling element. This segmentation allows each path to be optimized for specific frequency bands without requiring a switch to change the overall resonant mode.
Solution Approach 2:
The antenna structure is designed to perform multiple functions simultaneously - it can operate in both the first frequency band and the second frequency band at the same time through its multiple resonant paths. The shared ground electrode and feeding structure provide universal support for multi-frequency operation, eliminating the need for a switch while maintaining adaptability across different LTE frequency bands including LTE-700 and LTE-CA requirements.
2Device complexity
If the antenna uses a conventional printed inverted-F design, then the structure is simple, but the low frequency bandwidth is poor and cannot sufficiently cover the LTE-700 frequency band
Solution Approach 1:
The antenna design extends into the third dimension by utilizing vertical spacing between different resonant elements and coupling elements. The first and second resonant elements are positioned at different heights above the ground electrode, creating multiple resonant modes that can be excited at different frequencies. This dimensional approach allows the antenna to achieve broad bandwidth coverage including low frequency LTE-700 band while maintaining a relatively simple planar structure.
Solution Approach 2:
The antenna employs multiple resonant elements with different electrical lengths and coupling configurations to achieve resonance at different frequency bands. By adjusting the dimensions, positions, and coupling strengths of these elements, the antenna can be tuned to cover both low frequency (LTE-700) and high frequency bands simultaneously, transforming a single-frequency design into a multi-frequency broadband structure.
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 solution effectively satisfies LTE-CA requirements by generating distinct resonant modes for various frequency bands, including LTE-700, without the need for a switch, enhancing the antenna's performance and coverage.
Implementation Method 1
The first antenna is configured to generate a first resonant mode with the first capacitive coupling portion in a manner of capacitive coupling
Implementation Method 2
The first antenna is further configured to generate a second resonant mode with the second capacitive coupling portion in a manner of capacitive coupling
Implementation Method 3
the antenna module can generate plural resonant modes without a switch
Data Source
AI summary
A wireless communication apparatus includes a substrate, an electrical insulation cover, a first antenna and a second antenna. The substrate has a ground surface. The electrical insulation cover covers the substrate. The electrical insulation cover has first and second surfaces. The first antenna is disposed on the first surface and is electrically connected to the ground surface. The second antenna is disposed on the second surface and includes first and second capacitive coupling portions, a signal feeding portion and a first slit. The signal feeding portion connects the first and second capacitive coupling portions. The first slit is located between the first and second capacitive coupling portions. The first antenna can generate first and second resonant modes with the first and second capacitive coupling portions in a manner of capacitive coupling, respectively. The first and second resonant modes have different frequency bands.