Microstrip Patch Antenna with Anisotropic Superstrate
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Solution Overview
Problem
Existing microstrip patch antennas exhibit limited bandwidth and gain, particularly failing to perform effectively at frequencies used in new and emerging communication bands such as Iridium, which operates between 1616 MHz and 1626.5 MHz, and lack adaptability for additional services.
Innovation Solution
A highly anisotropic superstrate is positioned above the microstrip patch antenna with a specific spacing, featuring conductive strips on a dielectric material and capacitive load regions, and covered with a protective layer, enhancing the antenna's bandwidth and gain by altering current distribution and reducing standing waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional microstrip patch antenna is used, then the antenna structure is simple and easy to manufacture, but the bandwidth is narrow (2-6 percent) and gain is limited
Solution Approach 1:
A superstrate layer is introduced as an intermediary component between the patch antenna and free space. This superstrate modifies the electromagnetic environment, effectively broadening the bandwidth and improving gain without fundamentally redesigning the antenna structure itself.
Solution Approach 2:
The electromagnetic parameters of the antenna system are modified by introducing the superstrate with specific permittivity and permeability characteristics. This changes the effective impedance and resonance conditions, enabling broader bandwidth operation while maintaining structural simplicity.
2Adaptability or versatility
If the antenna is designed for specific GPS frequencies (L1 and L2), then it achieves good performance at those frequencies, but it cannot effectively operate at other communication frequencies such as Iridium band
Solution Approach 1:
The superstrate-enhanced antenna design provides multi-functionality by enabling operation across multiple frequency bands including GPS L1, L2, and Iridium bands. The superstrate acts as a universal enhancement that works across different frequency ranges rather than being optimized for a single frequency.
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 significantly broadens the antenna's bandwidth, allowing reception and transmission across a wider range of frequencies, supporting more communication channels and improving range, while being easily retrofitted to existing antennas.
Implementation Method 1
A highly anisotropic superstrate is formed and positioned at a predetermined spacing away from the ground plane side of the microstrip patch antenna. The highly anisotropic superstrate can includes a plurality of conductive strips regularly disposed over a dielectric material.
Data Source
AI summary
A method for improving bandwidth and gain of a microstrip patch antenna and a microstrip patch antenna are provided. The method includes forming a highly anisotropic superstrate, and positioning the highly anisotropic superstrate at a predetermined distance away from the ground plane side of the microstrip patch antenna, increasing the bandwidth of the microstrip patch antenna. The antenna provides a microstrip patch antenna having a highly anisotropic superstrate. The highly anisotropic superstrate can include a spacing layer, a dielectric material positioned on the spacing layer and a plurality of conductive strips disposed on the dielectric layer.