Stacked Loop Antenna Zigzag Configuration
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Solution Overview
Problem
Existing wireless communication devices, particularly those using the IEEE 802.15.4 standard, face challenges in reducing size and cost while maintaining effective antenna performance, as they require larger antenna systems that increase manufacturing costs and complexity.
Innovation Solution
The implementation of compact loop antennas stacked on a substrate, with transmit and receive loop elements disposed in zigzag configurations to minimize area and reduce electrical coupling, allowing for a smaller form factor and efficient radiation patterns without the need for additional components like baluns or RF switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional antenna systems are used in wireless communication devices, then antenna performance can be maintained, but device size and manufacturing cost increase
Solution Approach 1:
The patent implements nested stacking of multiple loop antennas (transmit and receive antennas) vertically on a single substrate. The antennas are positioned at different heights (e.g., first antenna at 0.125 inches, second antenna at 0.250 inches) to minimize mutual coupling while maintaining compact form factor. This nesting approach allows multiple antenna functions to coexist in a small volume without significant performance degradation
Solution Approach 2:
The patent transitions from planar antenna layouts to three-dimensional stacked configurations. By utilizing the vertical dimension (z-axis) rather than only horizontal space, the system accommodates multiple antennas within a compact footprint. The substrate supports antennas at different vertical levels, effectively using spatial dimensionality to reduce overall device volume while maintaining antenna performance
2Area of stationary object
If antenna size is reduced to decrease device footprint, then device complexity increases due to need for additional components
Solution Approach 1:
The patent combines transmit and receive antenna functions into a single integrated substrate structure. Multiple loop antennas are fabricated on the same substrate using conformal coating techniques, eliminating the need for separate antenna assemblies, baluns, and RF switches. This merging of functions reduces both the physical area required and the overall device complexity
Solution Approach 2:
The substrate serves multiple functions simultaneously: it provides mechanical support, electrical insulation, and a platform for fabricating multiple antenna elements. The conformal coating process enables the substrate to support both transmit and receive antennas with different ground plane configurations, making the single substrate universal for multiple antenna functions without requiring additional specialized components
3Volume of moving object
If multiple antennas are stacked closely to reduce size, then electrical coupling between antennas increases
Solution Approach 1:
The patent applies different ground plane configurations to different antenna elements based on their specific functional requirements. The first loop antenna has a first ground plane, while the second loop antenna has a second ground plane with different dimensions and positioning. This localized differentiation optimizes each antenna's radiation pattern and minimizes mutual coupling, allowing close stacking without significant electrical interference
Solution Approach 2:
The patent employs asymmetric ground plane designs where the ground planes for transmit and receive antennas have different sizes, shapes, and positions relative to their respective antennas. This asymmetry disrupts the symmetry of electromagnetic coupling paths, reducing mutual coupling effects and allowing the antennas to be positioned closer together while maintaining 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
This configuration results in a smaller, cost-effective transceiver device with improved antenna gain and radiation efficiency, reducing manufacturing costs and facilitating easier integration into devices while maintaining performance.
Implementation Method 1
a first loop element... configured to radiate signals in an omnidirectional radiation pattern... a second loop element... configured to radiate signals in a bidirectional radiation pattern
Data Source
AI summary
A small transceiver device and antenna system has an insulating layer with first and second surfaces. A transmit loop element having transmit loop segments is formed on the first surface. The transmit loop segments are disposed in a transmit zigzag configuration. A receive loop element having receive loop segments is formed on the second surface. The receive loop segments are disposed in a receive zigzag configuration. Each receive loop segment in the receive zigzag configuration is skewed with respect to a closest transmit loop segment disposed in the transmit zigzag configuration. The transmit loop segments can be grouped in two or more transmit zigzag configurations, and the receive loop segments can be grouped in two or more receive zigzag configurations.