Hybrid Feed Technique for Planar Antenna Isolation
Solution Overview
Problem
Current wireless communication systems face challenges in achieving high isolation between antenna feeds, particularly in patch antennas with dual orthogonal feeds, leading to increased feed line isolation issues and active impedance variation over beam scan angles, especially at mmWave frequencies.
Innovation Solution
The implementation of a hybrid feed technique using both a probe feed and a slot-coupled feed in a patch antenna, where the probe feed and slot-coupled feed are configured to transmit signals with orthogonal polarizations, reducing coupling between feeds and improving isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual orthogonal feed configuration is used in a patch antenna, then the antenna can support multiple polarizations and improve communication versatility, but feed line isolation deteriorates and active impedance variation increases
Solution Approach 1:
The patent introduces a ground plane as an intermediary element between the two orthogonal feeds. The ground plane acts as a shielding barrier that reduces electromagnetic coupling between the feeds, thereby improving isolation while maintaining the dual-polarization capability. The ground plane is positioned strategically to block interference paths without obstructing the radiation patterns.
Solution Approach 2:
The patent applies different feed configurations to different regions of the patch antenna. One feed is positioned at a specific location with optimized dimensions and orientation, while the other feed is placed in a different region with complementary characteristics. This local differentiation allows each feed to operate with minimal interference from the other, improving overall isolation.
2Area of stationary object
If dual orthogonal feeds are placed in close proximity to maintain compact antenna size, then the antenna footprint is reduced, but coupling between feeds increases and isolation decreases
Solution Approach 1:
The patent resolves the proximity issue by utilizing the vertical dimension through a ground plane structure. Instead of separating feeds horizontally (which would increase footprint), the ground plane is positioned vertically between the feeds to provide shielding. This dimensional approach maintains compact horizontal dimensions while achieving adequate isolation through vertical separation and shielding.
Solution Approach 2:
The ground plane serves as a mediating structure that enables close proximity operation of the feeds. By inserting this intermediary element between the feeds, the patent achieves both compact size and acceptable isolation, as the ground plane blocks direct coupling paths while allowing the feeds to remain in close horizontal proximity.
3Device complexity
If traditional single feed configuration is used, then device complexity is low, but bandwidth and polarization diversity are limited
Solution Approach 1:
The patent makes the patch antenna structure multi-functional by incorporating dual orthogonal feeds that can operate independently or together. The same patch and ground plane structure supports both horizontal and vertical polarizations, as well as omnidirectional and directional radiation patterns, without requiring separate antenna structures for each function.
Solution Approach 2:
The patent divides the feeding function into two independent orthogonal feeds, each capable of exciting different polarization modes. This segmentation allows the antenna to handle multiple communication channels and polarization states simultaneously, increasing versatility while keeping each individual feed relatively simple in 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 configuration enhances active s-parameters in array configurations, reducing signal power coupling between feeds and increasing radiated power in the intended polarization, thereby improving overall antenna performance.
Implementation Method 1
the probe feed and slot-coupled feed are configured to transmit signals with orthogonal polarizations, reducing coupling between feeds and improving isolation
Data Source
AI summary
In an aspect, an apparatus may be an apparatus for wireless communication. The apparatus for wireless communication may include a transceiver, a memory, and at least one processor coupled to the memory and configured to execute instructions stored in the memory to control the transceiver. In another aspect, an apparatus may be an apparatus for wireless communication. The apparatus for wireless communication may include a patch antenna coupled to the transceiver. The patch antenna includes a patch, a ground plane substantially located with respect to the patch, a probe feed coupled to the patch, and a slot-coupled feed configured to couple to the patch.