Broadband Antenna With Nested Radiation Members for Stable Resonance
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Solution Overview
Problem
Existing broadband antennas with ¼ wavelength resonant mode fail to meet bandwidth requirements at low frequencies, leading to resonant mode degradation in network listening (NL) systems operating at 1 GHz or less.
Innovation Solution
A broadband antenna design featuring a ground member and two radiation members connected in a specific configuration, allowing for ½ wavelength resonant modes across two frequency bands below 1 GHz without degradation, with the first radiation member surrounded by the second and spaced apart by a gap, enabling effective coverage of frequency bands between 729 MHz and 894 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a ¼ wavelength resonant mode antenna structure is used, then the antenna can be compact in size, but the resonant mode degrades at low frequencies and bandwidth requirements cannot be met
Solution Approach 1:
The antenna divides the radiation function into two separate radiation members (first and second radiation members), each providing a distinct resonant path. This segmentation allows each member to be optimized for specific frequency bands, preventing resonant mode degradation while maintaining compact overall antenna structure.
Solution Approach 2:
The first radiation member is positioned inside the second radiation member, creating a nested configuration. This nesting arrangement enables both radiation members to coexist in a compact space, achieving broadband performance without significantly increasing the antenna's external dimensions.
2Device complexity
If a ¼ wavelength resonant mode antenna structure is used, then the antenna structure is simple, but the frequency band requirements of NL systems cannot be met
Solution Approach 1:
The antenna structure is segmented into two radiation members with different resonant paths, enabling coverage of multiple frequency bands (including both 700 MHz and 800 MHz bands) while maintaining a relatively simple overall configuration that can be integrated into NL systems.
Solution Approach 2:
The dual radiation member design provides multi-functionality by enabling the antenna to operate across multiple frequency bands simultaneously, making it universally applicable to various NL system requirements without needing separate antennas for different bands.
3Adaptability or versatility
If the first radiation member is surrounded by the second radiation member with a gap, then broadband performance is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The gap between the first and second radiation members is designed with specific local dimensions (e.g., 0.5-2mm) that are optimized for broadband performance. By controlling the gap size in this specific local region rather than requiring precision throughout the entire antenna structure, broadband performance is achieved with manageable manufacturing tolerances.
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 provides stable ½ wavelength resonant modes across two frequency bands below 1 GHz, meeting the frequency band requirements of NL systems while maintaining a compact size, suitable for various communication devices.
Implementation Method 1
a first radiation member for providing a first resonant path to make the broadband antenna cover a first frequency band
Implementation Method 2
a second radiation member for providing a second resonance path to make the broadband antenna cover a second frequency band
Data Source
AI summary
A broadband antenna is provided. In the broadband antenna, the first end of a first radiation member is connected to the first end of a second radiation member to form a first commonly-connected end, and the second end of the first radiation member is connected to the second end of the second radiation member to form a second commonly-connected end, wherein the first commonly-connected end has a feed point, the second commonly-connected end is connected to a ground member, and the first radiation member is surrounded by the second radiation member and is spaced apart from the second radiation member by a gap. As a result, the broadband antenna can provide 2 frequency bands, each having ½ wavelength resonant mode in a frequency range less than 1 GHz, without the occurrence of resonant mode degradation.