Bent-Waveguide Omnidirectional Antenna for Terahertz Signals
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Solution Overview
Problem
Implementing an omnidirectional antenna for terahertz band wireless signals is challenging due to the directional nature of waveguides, which makes it difficult to radiate radio waves in all directions, especially at high frequencies where waveguides experience high transmission loss and coaxial cables are not viable.
Innovation Solution
The design incorporates a waveguide with a microstrip line and a radiation guide that includes a bent waveguide cavity, where the microstrip line penetrates the radiation guide, allowing for omnidirectional signal radiation through a structure stabilized by a radome, with a flat conductor and signal line perpendicular to the waveguide cavity axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a waveguide is used to transmit terahertz band signals, then transmission loss is reduced compared to coaxial cables, but the waveguide structure causes radio waves to be oriented in a particular direction, making omnidirectional radiation difficult
Solution Approach 1:
The waveguide system is segmented into distinct functional components: a waveguide for low-loss signal transmission, a transition section with bent cavity, and a radiation guide with multiple radiators. This segmentation allows each component to optimize its function while collectively achieving omnidirectional radiation capability.
Solution Approach 2:
A transition section with a bent waveguide cavity acts as an intermediary between the linear waveguide and the radiation guide. This intermediary component transforms the directional waveguide output into a configuration suitable for omnidirectional radiation through its bent geometry and coupling to multiple radiators.
2Loss of energy
If the frequency of radio waves is increased to terahertz band, then transmission loss in coaxial cables becomes unacceptable, but waveguide structures become necessary which complicates omnidirectional antenna implementation
Solution Approach 1:
The invention merges the waveguide transmission structure with the radiation guide into a integrated antenna system. The waveguide, transition section, and radiation guide are combined into a single unified structure that simultaneously provides low-loss transmission and omnidirectional radiation without requiring separate components.
Solution Approach 2:
The waveguide structure is designed to serve multiple functions: it acts as both the transmission line for terahertz signals and part of the radiation system through its bent cavity configuration. This multi-functionality reduces the need for additional specialized components while achieving both low loss and omnidirectional radiation.
3Reliability
If a microstrip line is added to the radiating portion of the omnidirectional antenna, then radiation characteristics and structural stability are improved, but manufacturing precision requirements increase
Solution Approach 1:
The design optimizes geometric parameters of the microstrip line and its integration with the radiation guide to achieve reliable radiation characteristics. By carefully selecting and adjusting parameters such as microstrip line width, length, and positioning, the system achieves stable performance while maintaining manufacturability through standardized dimensions.
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 enables uniform signal radiation in all directions with improved radiation characteristics and structural stability, suitable for high-frequency terahertz band applications.
Implementation Method 1
a waveguide configured to transmit a fed signal
Implementation Method 2
a microstrip line configured to radiate the fed signal transmitted from the waveguide
Data Source
AI summary
An omnidirectional antenna is provided. The omnidirectional antenna includes a waveguide configured to transmit a fed signal, a microstrip line configured to radiate the fed signal transmitted from the waveguide, and a radiation guide configured to guide the signal radiated from the microstrip line to omnidirectionally radiate the signal, wherein a waveguide cavity of the waveguide is bent at least once within the waveguide so that two surfaces of the microstrip line meet perpendicularly to a central axis of the waveguide cavity.