Multi-Band Microstrip Patch Antennas With Slot-Based Band Isolation
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Solution Overview
Problem
Existing microstrip antenna designs that provide isolation between frequency bands are complex and costly, lacking simplicity and efficiency in achieving multi-band operation.
Innovation Solution
The design employs strategically etched slots between tightly coupled microstrip patch antennas to achieve high isolation between frequency bands by exciting different modes on each contiguous portion of the patch antenna, using a decoupling technique that simplifies the fabrication and operation of multi-mode, multi-band antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex decoupling structures are used to achieve isolation between frequency bands, then isolation performance is improved, but device complexity increases
Solution Approach 1:
The patch antenna is segmented into multiple electrically isolated regions by etching slots that divide the continuous patch into separate segments. Each segment can be independently excited at different frequency bands, achieving band isolation through physical segmentation rather than complex decoupling structures.
Solution Approach 2:
Slots are etched into the patch antenna to extract and remove specific regions, creating gaps that electrically isolate different parts of the antenna. This extraction of material (creating slots) provides the necessary decoupling between frequency bands without requiring additional complex structures.
2Adaptability or versatility
If multiple elements are used to achieve multi-band operation, then frequency band coverage is improved, but device complexity increases
Solution Approach 1:
A single continuous patch antenna structure is designed to perform multiple functions by supporting different resonant modes at different frequency bands. The patch can be excited at fundamental and harmonic frequencies, as well as different resonant modes (TM10, TM20, etc.), allowing one element to cover multiple bands without requiring separate antenna elements.
Solution Approach 2:
The electrical characteristics of the patch antenna are changed by etching slots at specific positions and orientations. These parameter changes (slot position, length, width, orientation) allow the same physical structure to resonate at multiple frequency bands by altering the current distribution and effective electrical length of the patch.
3Reliability
If parasitic elements are used to achieve isolation, then isolation between bands is improved, but ease of manufacture deteriorates
Solution Approach 1:
The decoupling slots are merged directly into the patch antenna structure during the same fabrication process. Rather than adding separate parasitic elements as additional components, the slots are etched as integral parts of the patch, combining the radiating element and the decoupling structure into a single manufactured component.
Data Source
AI summary
Multi-band, microstrip patch antennas, as well as methods of fabricating the same and methods of using the same, are provided. A decoupling technique can be used where strategically etched slots are provided between the tightly coupled microstrip patch antennas, and the appropriate mode excitation of the corresponding patch antennas can be used. The antennas have high isolation between the frequency bands of operation. Multi-band operation can be achieved by exciting a different mode on each contiguous portion of the patch antenna.