Slot-Dipole Antenna Structure for Stable Broadband Beamwidth
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Solution Overview
Problem
The beamwidth of existing horn antennas changes significantly with frequency, leading to poor broadband characteristics due to varying antenna gain, which affects the directional radiation pattern.
Innovation Solution
An antenna structure combining a slot antenna and a dipole antenna, with a dielectric substrate and a feeder, allowing the antenna to transition between radiation modes to maintain consistent beamwidth across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a horn antenna uses a common radiation port surface for both high and low frequencies, then the antenna can operate across a wide frequency range, but the beamwidth becomes acute at high frequencies and the radiation pattern shows poor broadband characteristics
Solution Approach 1:
The radiation structure is segmented into two distinct parts: a first radiation sheet forming a slot antenna for high frequencies and a second radiation sheet forming a dipole antenna for low frequencies. Each radiation sheet operates independently in its designated frequency range, allowing the antenna to maintain consistent beamwidth characteristics across the entire broadband range without the beamwidth acute problem of conventional horn antennas
Solution Approach 2:
The antenna dynamically switches between two radiation modes based on frequency: the slot antenna mode dominates at high frequencies while the dipole antenna mode dominates at low frequencies. This dynamic mode switching enables the radiation pattern to adapt to frequency changes while maintaining stable beamwidth characteristics throughout the operating band
2Adaptability or versatility
If the beamwidth changes significantly with frequency, then the antenna can cover a wide frequency band, but the antenna gain varies greatly resulting in poor broadband radiation pattern characteristics
Solution Approach 1:
The radiation function is segmented between two specialized structures: the slot antenna (first radiation sheet) handles high-frequency radiation with stable beamwidth, while the dipole antenna (second radiation sheet) handles low-frequency radiation. This segmentation ensures that each frequency range is served by an optimized structure, maintaining reliable and stable radiation pattern characteristics across the entire frequency band
Solution Approach 2:
The antenna changes its effective radiation parameters by switching between two modes: at high frequencies, the slot antenna geometry dominates providing narrow, stable beamwidth; at low frequencies, the dipole antenna geometry dominates providing broader, stable beamwidth. This parameter change through mode switching ensures consistent radiation pattern reliability across the full frequency band
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 structure achieves broadband characteristics by maintaining consistent beamwidth from low to high frequencies, enabling ultra-wide frequency operation with stable radiation patterns.
Implementation Method 1
the first part, the third part and the gap form a slot antenna, and the second part and the fourth part form a dipole antenna
Data Source
AI summary
An antenna structure includes: a dielectric substrate, a first radiation sheet including a first portion and a second portion that is connected to the first portion, a second radiation sheet including a third portion and a fourth portion that is connected to the third portion, a gap formed between second radiation sheet and the first radiation sheet, and a feeder line including a first end for inputting an excitation signal, and a second end for feeding the excitation signal into the first radiation sheet and the second radiation sheet. The first portion, the third portion and gap form a slot antenna, and second portion and the fourth portion form a dipole antenna.