Wireless Module Antenna Isolation via Asymmetric Base Plate
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Solution Overview
Problem
Existing wireless communication devices face challenges in enhancing isolation between antennas while expanding the frequency band over which isolation is maintained, leading to interference and reduced performance.
Innovation Solution
A wireless module design featuring a substrate with a ground pattern, two antennas, and a conductive base plate that includes short-circuit points closer to one antenna than the other, optimizing the electrical length and gap formations to reduce interference and enhance isolation across a broader frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two antennas are disposed close to each other on a substrate, then the device size is reduced, but isolation between the antennas deteriorates
Solution Approach 1:
A base plate is introduced as an intermediary component between the first and second antennas. The base plate includes first and second gaps that electrically isolate the antennas from each other while maintaining compact positioning. This mediator structure reduces mutual interference between antennas without requiring large separation distances, thus achieving both small device size and good isolation.
Solution Approach 2:
The base plate is segmented into distinct regions with gaps (first gap and second gap) that create electrical isolation zones between the antennas. By dividing the base plate structure into isolated segments rather than a continuous conductive plane, the patent achieves frequency-dependent isolation that improves antenna performance while maintaining compact form factor.
2Object-generated harmful factors
If isolation between antennas is enhanced using conventional methods, then interference is reduced, but the frequency band over which isolation is maintained is limited
Solution Approach 1:
The patent utilizes frequency-dependent electromagnetic characteristics by designing the base plate gaps with specific dimensions and positions that create different isolation effects at different frequencies. The first and second gaps are configured to provide effective isolation across a broad frequency range by exploiting changes in electromagnetic field distribution and impedance characteristics with frequency, thus maintaining isolation performance across multiple frequency bands.
Solution Approach 2:
The base plate features asymmetric gap configurations where the first gap and second gap have different dimensions, positions, and orientations relative to the antennas. This asymmetric design creates frequency-selective isolation characteristics that effectively suppress interference across a wide frequency range by targeting different frequency components with different gap structures, thereby expanding the usable frequency band.
3Ease of manufacture
If a symmetric base plate structure is used, then manufacturing is simplified, but isolation performance across different frequencies is compromised
Solution Approach 1:
The base plate employs asymmetric gap structures where the first gap and second gap differ in size, shape, and position relative to the respective antennas. This asymmetric configuration is deliberately designed to create frequency-selective isolation effects that target different interference patterns at different frequencies. While slightly more complex than symmetric designs, the asymmetric structure remains manufacturable and provides superior broadband isolation performance.
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 effectively increases the isolation between antennas, allowing for stable operation across a wider frequency band and reducing interference, thus improving the performance of the wireless module.
Implementation Method 1
The base plate includes a first opposed portion that faces the first antenna, a second opposed portion that faces the second antenna, and a third opposed portion that faces the ground pattern and is short-circuited to the ground pattern. The base plate also has, on the third opposed portion, a short-circuit point at which the base plate and the ground pattern are short-circuited to each other.
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2
AI summary
Provided is a wireless module that is capable of improving isolation between two antennas. This wireless module includes a substrate, a ground pattern disposed on the substrate, a first antenna, a second antenna, and a base plate that is conductive. The first antenna is disposed between one end of the substrate and the ground pattern, and includes a grounding part and a first power feeding part, the grounding part is connected to the ground pattern, and the first power feeding part is fed with a first signal. The second antenna is disposed between the other end of the substrate and the ground pattern, and includes a second power feeding part fed with a second signal. The base plate includes a first opposed portion that faces the first antenna, a second opposed portion that faces the second antenna, and a third opposed portion that faces the ground pattern and is short-circuited to the ground pattern. The base plate also has, on the third opposed portion, a short-circuit point at which the base plate and the ground pattern are short-circuited to each other. The short-circuit point is disposed on the third opposed portion at a position nearer to the first opposed portion than to the second opposed portion.