Cable Antenna Balanced-to-Unbalanced Transformer Radiation Control
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Solution Overview
Problem
Conventional cable type antennas face challenges in reducing size and weight while accurately defining the radiation region and optimizing antenna length due to the use of ferrite rings for surface wave attenuation, leading to inefficiencies in communication energy and radiation characteristics.
Innovation Solution
A cable type antenna configuration that includes a first conductor connected to a power feeding circuit, a second conductor, a matching circuit, and a balanced-to-unbalanced transformer element, allowing the antenna to be sectionalized into non-radiation and radiation parts, with the transformer element setting the radiation region to a desired length, reducing the need for ferrite rings and enhancing communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ferrite rings are used to attenuate surface waves and define antenna length, then the radiation region can be specified, but the antenna size and weight increase significantly
Solution Approach 1:
The invention extracts the surface wave attenuation function from the traditional ferrite ring structure and relocates it to a dedicated attenuation section with specific impedance characteristics. This separation allows the main antenna body to be lightweight while the attenuation function is handled by a specialized section that can be optimized independently.
Solution Approach 2:
The invention changes the impedance parameter of the attenuation section to create surface wave attenuation without requiring ferrite materials. By controlling the impedance of the attenuation section to differ from both the feed line and radiation section, surface waves are naturally attenuated through impedance mismatch, eliminating the need for heavy ferrite rings.
2Measurement precision
If ferrite rings are used to attenuate surface waves, then the radiation region can be specified, but communication energy is lost due to magnetic loss
Solution Approach 1:
The invention converts the harmful magnetic loss of ferrite rings into a beneficial impedance mismatch mechanism. Instead of using ferrite's magnetic loss to attenuate surface waves, the invention uses impedance discontinuity at the attenuation section to achieve the same attenuation effect without energy dissipation as heat, thereby preserving communication energy.
3Object-affected harmful factors
If ferrite rings are disposed at predetermined intervals to attenuate traveling waves, then surface wave attenuation is achieved, but the device complexity and required cable length increase
Solution Approach 1:
The invention segments the coaxial cable into three distinct functional sections: a feed line section, an attenuation section, and a radiation section. This segmentation allows each section to be optimized for its specific function, with the attenuation section having controlled impedance to naturally attenuate surface waves without requiring multiple discrete ferrite ring components.
4Object-affected harmful factors
If ferrite rings are used to gradually attenuate traveling waves, then surface wave suppression is achieved, but the substantial antenna length cannot be accurately defined
Solution Approach 1:
The invention performs preliminary action by creating a distinct attenuation section with specific impedance characteristics before the radiation section. This preliminary attenuation section clearly defines the boundary between the non-radiating and radiating portions, allowing the antenna length to be precisely determined from the start of the radiation section to its end, without ambiguity from gradual attenuation.
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 results in a small-sized, lightweight antenna with improved communication characteristics, allowing for precise definition of the radiation region and reduced energy loss, enabling stable and efficient short-range communication.
Implementation Method 1
a balanced-to-unbalanced transformer element disposed between the first region and the second region, and wherein the balanced-to-unbalanced transformer element includes an unbalanced-side terminal connected to the first region and a balanced-side terminal connected to the second region
Data Source
AI summary
A cable type antenna is provided having a small-sized lightweight configuration and enabling specifying of a radiation region having a desired antenna length. The cable type antenna may be sectionalized into a first region on the power feeding circuit side and a second region on the leading end side. The cable type antenna of the present disclosure further comprises a balanced-to-unbalanced transformer element disposed between the first region and the second region, wherein the balanced-to-unbalanced transformer element includes an unbalanced-side terminal connected to the first region and a balanced-side terminal connected to the second region configured to allow the first region to serve as a non-radiation part and the second region to serve as a radiation part.