Combination Antenna Element for Multi-Band Wireless Systems
Solution Overview
Problem
Existing antenna systems face challenges in operating in multiple frequency bands due to size and spacing requirements, leading to performance interference between different frequency band elements.
Innovation Solution
A combination antenna element comprising a waveguide antenna element and a patch antenna element, where the waveguide antenna operates in a first frequency band using a Transverse Electric or Transverse Magnetic mode, and the patch antenna operates in a second frequency band using a Transverse Electromagnetic mode, with the patch antenna having an open perimeter defining an interior region for the waveguide antenna alignment, minimizing coupling and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antenna elements for different frequency bands are placed in close physical proximity to achieve multi-band operation, then system bandwidth and agility are improved, but mutual coupling and performance interference between different frequency band elements increase
Solution Approach 1:
The patent places the first antenna element (for first frequency band) inside the interior region defined by the perimeter of the second antenna element (for second frequency band). This nesting arrangement allows both antenna elements to occupy overlapping spatial regions, enabling close physical proximity for multi-band operation while the distinct geometric configurations minimize mutual coupling interference between the different frequency band elements.
Solution Approach 2:
The patent employs different geometric configurations for the two antenna elements - the second antenna element has a specific perimeter shape (such as E-shape, F-shape, or meander line) that defines an interior region, while the first antenna element has a different geometric configuration placed within that interior region. These differentiated local geometric qualities allow each element to be optimized for its specific frequency band while minimizing interference with the other element.
2Adaptability or versatility
If antenna elements of different sizes are interleaved to operate in different frequency bands, then frequency band coverage is improved, but element interleaving becomes problematic due to size mismatch
Solution Approach 1:
The patent resolves the size mismatch problem by transitioning from a two-dimensional planar arrangement to a three-dimensional configuration. The first antenna element is positioned in a different plane (such as on a different PCB layer) than the second antenna element, allowing elements of different sizes to coexist without spatial conflict. This dimensional change enables straightforward interleaving of elements with significantly different footprint sizes while maintaining proper spacing for each frequency band's performance 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 allows for efficient operation in dual-frequency bands with reduced mutual coupling, enabling compact and cost-effective implementation in wireless communication devices, such as handheld devices and routers, while maintaining optimal performance across both frequency bands.
Implementation Method 1
the waveguide antenna element operates in a first frequency band using a Transverse Electric or Transverse Magnetic mode
Implementation Method 2
the waveguide antenna element operates in a first frequency band using a Transverse Electric or Transverse Magnetic mode
Implementation Method 3
the patch antenna operates in a second frequency band using a Transverse Electromagnetic mode
Data Source
AI summary
A combination antenna element is provided. A first antenna element, for example a waveguide antenna, may be coupled to a waveguide feed such as a Substrate Integrated Waveguide (SIW). The waveguide antenna may be formed as an aperture at a terminus of the SIW and disposed within a Printed Circuit Board (PCB) internal layer. A second antenna element, for example a microstrip patch antenna (MPA), may be provided on an outer PCB layer, the MPA defining an interior region, the interior region being positioned in line with the first antenna element. Also in some embodiments, the second antenna element is coupled to another antenna feed such as a transmission line feed which propagates signals in a different electromagnetic propagation mode than the waveguide. The transmission line feed may be a stripline located within the waveguide. An antenna array incorporating the combination antenna element is also provided.