Substrate Dipole Antenna Slit Ground Structure
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Solution Overview
Problem
Substrate type dipole antennas experience leakage of electric current on the outer part of the external conductor of a coaxial cable, leading to distortion of the intended radiation pattern.
Innovation Solution
A substrate type dipole antenna design featuring a dielectric substrate with a first radiator, a signal line, and multiple second radiators with slits, positioned according to a coplanar waveguide or microstrip feed method, where the slits block electric current from flowing to the coaxial cable, preventing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a coaxial cable is connected to feed the substrate type dipole antenna, then energy transmission to the antenna is achieved, but electric current leaks on the outer part of the external conductor causing radiation pattern distortion
Solution Approach 1:
A ground structure is introduced as an intermediary element between the coaxial cable and the radiating elements. This ground structure acts as a mediator that provides a controlled path for return current, preventing it from leaking onto the outer conductor of the coaxial cable, thereby eliminating radiation pattern distortion while maintaining energy transmission efficiency
2Stability of the object's composition
If the coaxial cable is oriented perpendicular to the antenna substrate to reduce current leakage, then some radiation pattern stability is improved, but electric wave interference occurs between the antenna and coaxial cable
Solution Approach 1:
The feeding structure is segmented into distinct functional zones: a signal transmission path through the substrate, a separate ground structure for return current, and isolated radiating elements. This segmentation allows the coaxial cable to maintain its feeding function without causing interference, as the ground structure captures return currents before they can interact with the radiating elements
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 effectively prevents electric current leakage, maintaining a stable and intended radiation pattern, ensuring maximum radiation direction without distortion.
Implementation Method 1
a plurality of second radiators respectively having therein a plurality of slits of a predetermined configuration
Data Source
AI summary
A Ultra WideBand (UWB) substrate type dipole antenna is provided which has a stable radiation pattern. The UWB substrate type dipole antenna includes a dielectric substrate, a first radiator formed on a side of the dielectric substrate, a signal line transmitting an energy from a coaxial cable to the first radiator, and a plurality of second radiators formed at a predetermined distance from the first radiator and the signal line, and respectively having therein a plurality of slits of a predetermined configuration. Because there is no leakage of electric current to an outer part of an external conductor of the coaxial cable, even when the connection of the connector and the coaxial cable to the antenna, distortion of the radiation pattern of the antenna is prevented. As a result, the same radiation pattern and the direction of maximum radiation may be obtained before and after connection with the connector and the coaxial cable.