Segmented Monopole Antenna Impedance Matching
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Solution Overview
Problem
The New Motorola (NMO) mount, a standard for mobile antennas, faces performance issues with higher frequencies due to signal reflection, making it challenging to simultaneously operate with both low and high frequency bands, particularly above 1 GHz, and existing solutions are costly and complex.
Innovation Solution
A top-loaded monopole antenna design with an electromagnetically coupled feed that matches impedance for both low and high frequency signals, using a conductive top load radiator cap and a resonator to enable dual-band operation without interference, allowing for efficient transmission and reception across a broad range of frequencies including 700 MHz to 960 MHz and 1 GHz to 3 GHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional monopole antenna is used with NMO mount, then it works well for low frequency bands, but it experiences signal reflection and performance degradation at high frequency bands above 1 GHz
Solution Approach 1:
The monopole antenna is divided into multiple sections with different diameters along its length. The lower portion has a larger diameter while the upper portion has a smaller diameter, creating a segmented structure that allows different sections to resonate at different frequency bands, enabling simultaneous operation at both low and high frequencies
Solution Approach 2:
Different sections of the monopole antenna are given different local properties through varying diameters. The lower section with larger diameter is optimized for low frequency operation while the upper section with smaller diameter is optimized for high frequency operation, allowing each part to perform its specific function effectively
2Reliability
If separate antennas are used for low and high frequency bands, then each antenna can be optimized for its specific band, but the system becomes more complex and costly
Solution Approach 1:
The patent combines multiple frequency band capabilities into a single monopole antenna structure. By integrating low frequency and high frequency resonance capabilities into one antenna with segmented diameter variations, the system achieves dual-band operation without requiring separate antennas, thereby reducing overall system complexity
Solution Approach 2:
The monopole antenna is designed to perform multiple functions simultaneously - it can operate at both low frequency bands (e.g., 800 MHz) and high frequency bands (e.g., 1700-1900 MHz) through its segmented structure, making it a universal antenna solution for multi-band wireless communication systems
3Adaptability or versatility
If the monopole diameter is increased to broaden bandwidth, then the operational bandwidth increases, but the physical height and volume of the antenna increases
Solution Approach 1:
The monopole is segmented into sections with different diameters, allowing the lower section to provide broadband characteristics through larger diameter while the upper section maintains smaller diameter for compactness. This segmentation enables bandwidth extension without proportionally increasing overall antenna volume
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 antenna achieves efficient dual-band operation with minimal interference, optimizing impedance matching for both low and high frequency bands, and is compatible with traditional antenna mounts like the NMO mount, enhancing communication capabilities across extended frequency ranges.
Implementation Method 1
a top load radiator cap electromagnetically coupled to the upper portion of the radiator element and matching an impedance of the antenna for at least one low frequency signal
Implementation Method 2
matching an impedance of the antenna for at least one low frequency signal, wherein the top load radiator cap is made from a conductive material
Implementation Method 3
a first resonator directly connected to the lower portion of the radiator element and matching an impedance of the antenna for at least one high frequency signal
Data Source
AI summary
Disclosed herein is a top load multi-band monopole antenna that is utilized with an integrated electromagnetic coupling feed wire and resonator combination achieving broad band and multi-band performance for multiple frequency spectrums. The top loaded monopole can utilize 450-520 MHz, 698 through 960 MHz and 1000 through 3000 MHz bands contiguously and simultaneously by implementation of the coupling feed wire and resonator combination. The electromagnetically coupled top load resonator in conjunction with the lower monopole resonator section matches impedance for both low frequency and high frequency range operation. A flexible radome housing structure augments impact resistance by permitting the monopole radiator aperture to flex under mechanical load while maintaining reliable signal transmission and reception properties.