Multi-Structure Monopole Antenna for Vehicle Frequency Band Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vertical broadband monopole antennas for vehicles are limited by their narrow frequency bands, high production costs, and complex manufacturing processes, making them unsuitable for modern cellular networks requiring wide frequency bands and aerodynamic designs.
Innovation Solution
A multi-structure broadband monopole antenna design featuring a combination of high-band and low-band monopoles with inductively connected triangular and rectangular structures, utilizing meandering conductor strips and capacitive coupling for impedance matching, eliminating the need for additional matching networks and reducing production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wire windings are applied to the elongated rod to cover multiple frequency bands, then the frequency band coverage is improved, but the manufacturing complexity and production cost increase significantly
Solution Approach 1:
The antenna rod is divided into multiple distinct winding sections (first winding section, second winding section, third winding section), each responsible for different frequency bands. This segmentation allows each section to be optimized independently for its specific frequency range while simplifying the overall manufacturing process compared to complex multi-winding designs.
Solution Approach 2:
Different winding sections are designed with different local characteristics - the first winding section has specific turn density and geometry for lower frequencies, while the second and third sections have different configurations for higher frequencies. This local optimization enables broad frequency coverage without requiring complex global restructuring of the entire antenna.
2Adaptability or versatility
If multiple wire windings with partial overlaps are used to achieve broadband performance, then the frequency band coverage is improved, but the mechanical tolerance requirements and production precision increase
Solution Approach 1:
The antenna is segmented into distinct winding sections with clear boundaries, eliminating the need for tight overlaps between windings. Each section can be manufactured and positioned independently with standard tolerances, significantly reducing the cumulative error propagation that would occur in tightly overlapped multi-winding designs.
Solution Approach 2:
Instead of using tight overlaps between windings to achieve broadband performance (the conventional approach), the invention uses deliberately separated winding sections with gaps between them. This inverted approach achieves broadband coverage through the combined resonant frequencies of separate sections rather than through overlapping continuous windings.
3Object-affected harmful factors
If the overall height of the antenna is reduced for aerodynamic purposes, then the aerodynamic performance is improved, but the frequency band coverage and antenna gain deteriorate
Solution Approach 1:
The antenna windings are arranged in a three-dimensional configuration around the rod, utilizing radial and axial dimensions rather than simply extending the rod length. This allows the antenna to achieve broadband performance and adequate gain within a compact height by exploiting the spatial arrangement of windings in multiple dimensions.
Solution Approach 2:
The invention changes key geometric parameters of the windings - such as turn density, winding diameter, and spacing between sections - to optimize the resonant frequencies and impedance matching. By carefully adjusting these parameters, the antenna achieves broad frequency coverage and acceptable gain within a reduced height suitable for aerodynamic vehicle applications.
4Adaptability or versatility
If complex matching networks with concentrated components are added to achieve impedance matching, then the frequency band coverage is improved, but the device complexity and production cost increase
Solution Approach 1:
The impedance matching function is merged into the antenna structure itself through the carefully designed winding sections. The geometric configuration of the windings provides inherent impedance transformation and matching, eliminating the need for separate concentrated matching components such as inductors and capacitors that would add complexity and cost.
Solution Approach 2:
The winding sections serve multiple functions simultaneously: they provide the radiating elements for broadband coverage, act as impedance transformers for matching, and function as resonant circuits for frequency selection. This multi-functionality eliminates the need for separate dedicated matching networks, simplifying the overall device while maintaining broad frequency coverage.
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 design achieves broadband performance across the frequency range with a low overall height, favorable aerodynamics, and cost-effective production, meeting the requirements for modern cellular networks while maintaining high impedance matching and reduced wind resistance.
Implementation Method 1
The triangular structure and the first rectangular structure are inductively connected with high impedance by a conductor strip for separating radio signals
Implementation Method 2
utilizing meandering conductor strips and capacitive coupling for impedance matching
Data Source
Figure 1~23
Figure 2
Figure 3
AI summary
The invention relates to a vertical broadband monopole antenna for vehicles, for two frequency bands separated by a frequency gap, said antenna having a first capacity top and a further capacity top, which is capacitively coupled to the first capacity top, wherein the further capacity top has at least one inductive high-resistance conductive strip, which extends to a conductive ground surface and is conductively connected thereto at its lower end.