Multi-band Antenna Using Frequency Multiplexing Circuit
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Solution Overview
Problem
Current multi-band antenna solutions for mobile terminals require separate antenna elements for each frequency band, leading to inefficient use of limited space and increased volume, as they need to isolate coupling elements to prevent frequency interference, resulting in suboptimal frequency bandwidth coverage.
Innovation Solution
A multi-band antenna design utilizing a single antenna element with frequency multiplexing circuits and feeding strips, where matching circuits are embedded within the multiplexing circuit or between the feeding strips and the antenna element, allowing for impedance matching and frequency separation to enable operation across multiple frequency bands without the need for separate antenna elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate antenna elements are used for each frequency band, then frequency band coverage is achieved, but antenna volume increases and space efficiency decreases
Solution Approach 1:
The patent implements a single antenna element that serves multiple frequency bands (GSM 850/900/1800/1900 and WCDMA bands) through frequency-selective coupling elements and matching circuits, eliminating the need for separate antennas for each band while maintaining full frequency band coverage
Solution Approach 2:
The patent combines multiple frequency band handling capabilities into a single integrated antenna structure by using multiple coupling elements with different geometries (strip, loop, meander) that are electrically connected to the same antenna element, merging what would traditionally require separate antenna elements
2Reliability
If coupling elements are isolated from each other, then frequency interference is prevented, but antenna volume efficiency decreases
Solution Approach 1:
The patent introduces frequency-selective matching circuits and coupling elements as intermediaries between the single antenna element and different frequency bands, allowing multiple frequency paths to coexist without direct interference while maintaining efficient use of the antenna volume
Solution Approach 2:
The patent segments the frequency handling function into separate coupling elements (strip coupling element for lower bands, loop coupling element for higher bands) that are electrically connected to the same antenna element, achieving frequency isolation without physical separation of the antenna elements themselves
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 design optimizes antenna volume usage by allowing a single antenna element to cover multiple frequency bands efficiently, achieving improved impedance bandwidth and reducing physical constraints, thereby enhancing the overall performance and coverage of wireless communication systems.
Implementation Method 1
The matching circuits are embedded in the frequency multiplexing circuit, the matching circuits providing impedance matching of the feeding strips for a predetermined frequency band
Implementation Method 2
The first resonant matching circuit is coupled to the first port and is disposed on the substrate and has a plurality of components by means of which it is possible to implement a band-pass filter within the first frequency band
Implementation Method 3
the first resonant matching circuit... has a plurality of components by means of which it is possible to implement a band-pass filter within the first frequency band
Implementation Method 4
The first coupling element is mounted to the substrate and particularly adapted to couple a first frequency band to a ground plane through a first port
Data Source
AI summary
A multi-band antenna includes a ground plane, a single antenna element, a frequency multiplexing circuit and at least two feeding strips coupled between the frequency multiplexing circuit and the single antenna element. Furthermore, the feeding of the antenna is arranged by one or more feeding points arranged between the ground plane and the frequency multiplexing circuit. According to first implementation one feeding point is arranged for at least two antenna branches. The signal fed into the feeding point is multiplexed by the multiplexing circuit to the antenna branches. According to at least one other implementation a dedicated feeding point is arranged for each of the antenna branches. At the same time the isolation of the frequencies between the different branches is arranged. This can be achieved e.g. by a multiplexing circuit. Moreover, impedance of the antenna branches can be matched with matching circuitry.