Multiband Antenna With Frequency Blocking Stubs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antennas are limited to single or adjacent frequency bands, making them inefficient for use in multiple bands of different frequency bands, which is increasingly required in modern communications.
Innovation Solution
A multiband antenna design that includes at least two radiation elements, high frequency power supply units, low frequency power supply units, and high/low frequency blocking circuits, allowing independent operation of radiation elements and passive elements to radiate high and low frequency signals, with specific configurations to resonate in multiple modes and block unwanted frequency signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna is used for multiple frequency bands, then device complexity is reduced, but it becomes difficult to ensure stable radiation characteristics across different bands
Solution Approach 1:
The antenna system is segmented into multiple independent radiation elements (first radiation element and second radiation element), each optimized for specific frequency bands. The first radiation element handles first and second frequency bands, while the second radiation element handles third and fourth frequency bands, allowing each segment to maintain stable characteristics in its designated bands without interference from other bands.
2Reliability
If multiple separate antennas are used for different frequency bands, then radiation characteristics are optimized for each band, but device complexity and space requirements increase
Solution Approach 1:
Multiple radiation elements that would traditionally be separate antennas are merged into a single integrated antenna structure. The first and second radiation elements share common connection lines and power supply units, and are arranged in close proximity on the same circuit board, reducing overall device complexity while maintaining band-specific optimization through the use of frequency selective networks.
Solution Approach 2:
The antenna system achieves multi-functionality where a single antenna structure serves multiple frequency bands through different radiation elements. The first radiation element can operate in first and second frequency bands, while the second radiation element operates in third and fourth frequency bands, allowing one antenna system to perform the function of multiple separate antennas.
3Reliability
If high frequency blocking circuits are added to prevent high frequency interference, then high frequency signal integrity is maintained, but device complexity increases
Solution Approach 1:
The high frequency blocking circuits are merged into the existing connection lines between radiation elements, rather than being added as separate external components. The blocking circuits utilize the same power supply lines and connection structures already present in the antenna system, thereby maintaining high frequency signal integrity without significantly increasing overall device complexity.
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
Enables efficient operation across multiple frequency bands by ensuring each radiation element or passive element functions independently, allowing for miniaturization and increased mounting efficiency while maintaining stable characteristics, thus supporting a broader range of frequencies.
Implementation Method 1
high frequency blocking circuits that are connected to the radiation element connection lines and the low frequency power supply line, and configured to block transmission of the high frequency signal
Implementation Method 2
length between the other end of the series radiation element and the low frequency power supply unit is set to a dimension such that the low frequency signal resonates in a plurality of modes, and low frequency signals of different wave lengths are radiated from the series radiation element
Implementation Method 3
supplying a high frequency signal from the high frequency power supply unit to the radiation element makes it possible to radiate a high frequency signal from the radiation element. Meanwhile, supplying a low frequency signal from the low frequency power supply unit to the series radiation unit makes it possible to radiate a low frequency signal from the series radiation element
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
Two high frequency antennas (6) are provided in a multilayer substrate (2). Each high frequency antenna (6) is configured of a radiation element (7), a high frequency power supply line (8), and a high frequency power supply unit (9). A low frequency antenna (10) is configured of a series radiation element (11), a low frequency power supply line (13'), and a lower frequency power supply unit (14). The series radiation element (11) is formed of two radiation elements (7) connected by a radiation element connection line (12). One end side of the series radiation element (11) is connected to the low frequency power supply unit (14) via the low frequency power supply line (13). Open stubs (15) to block transmission of a high frequency signal (SH) are connected to the radiation element connection line (12) and the low frequency power supply line (13). Short stubs (16) to block transmission of a low frequency signal (SL) are connected to the high frequency power supply lines (8).