UWB Antenna Unidirectional Radiation Dipole Loop
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Solution Overview
Problem
Conventional UWB antennas with unidirectional radiation patterns face challenges in achieving a wide enough frequency band for efficient data transmission and security, with existing designs either having a narrow bandwidth or large antenna sizes that limit directional radiation patterns.
Innovation Solution
A UWB antenna combining a dipole and loop antenna structure with a power feeder, where the dipole part and loop part are connected in a closed-loop shape, allowing for perpendicular radiation and power feeding, and implemented with microstrip or coplanar waveguide transmission lines, enabling efficient radiation perpendicular to the antenna plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wideband antenna with U-slot is used, then cost-effectiveness and gain are improved, but bandwidth becomes narrower than UWB requirements
Solution Approach 1:
The patent combines a dipole antenna structure and a loop antenna structure into a single integrated radiator. The dipole part provides broadband characteristics while the loop part contributes to unidirectional radiation pattern, achieving both wide bandwidth and directional radiation without requiring separate antenna elements
2Adaptability or versatility
If a wire dipole with wide plane conductor is used, then bandwidth is improved, but radiation directionality is lost
Solution Approach 1:
The patent merges dipole and loop antenna structures where the dipole provides broadband operation and the loop component introduces directional radiation characteristics. This combination maintains wide bandwidth while achieving unidirectional radiation pattern perpendicular to the substrate
Solution Approach 2:
The antenna employs asymmetric feeding configuration where the power feeder connects to one specific point on the dipole-loop structure, creating unidirectional radiation pattern. The asymmetric geometry of the radiator relative to the feed point enables directional radiation while maintaining broadband operation
3Volume of moving object
If a small-sized antenna is used, then compactness is improved, but directional radiation pattern cannot be obtained
Solution Approach 1:
The patent transitions from planar antenna designs to a three-dimensional structure by forming the dipole and loop components in multiple layers or at different heights above the substrate. This vertical dimensionality enables compact footprint while achieving directional radiation pattern through spatial configuration
4Productivity
If conventional UWB antennas are used, then data transmission is enabled, but data security is compromised due to omnidirectional radiation
Solution Approach 1:
The asymmetric feeding configuration and non-uniform geometry of the dipole-loop radiator create unidirectional radiation pattern that concentrates energy in a specific direction. This directional radiation enhances data security by limiting the spatial coverage of transmitted signals, making eavesdropping more difficult compared to omnidirectional antennas
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 a high gain and unidirectional radiation pattern across various frequency bands, enhancing data transmission security and efficiency while maintaining a compact size, with improved VSWR, gain, and group delay characteristics.
Implementation Method 1
a radiator comprising a dipole part, connected with the feeding point on the basis of the feeding point, and a loop part, whose both ends are connected with both ends of the dipole part respectively to be closed-loop-shaped
Data Source
AI summary
An ultra wide band (UWB) antenna with a unidirectional radiation pattern, including: a power feeder including a connecting point at one end and a feeding point at the other end; and a radiator including a dipole part, connected with the feeding point on the basis of the feeding point, and a loop part, whose both ends are connected with both ends of the dipole part respectively to be closed-loop-shaped. Accordingly, a UWB antenna with a unidirectional radiation pattern which mainly performs radiation perpendicular to an antenna plane can be provided.