Multi-frequency Antenna With Filtering Element For Compact Design
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Solution Overview
Problem
Current multi-frequency antennas, such as microstrip and PIFA antennas, face challenges in reducing size and weight while supporting multiple resonance frequencies, which is essential for modern wireless communication devices that require signal transmission and reception across various frequency bands.
Innovation Solution
A multi-frequency antenna design that incorporates one or more filtering elements between two resonance units, allowing the generation of two or more resonant frequencies, with the filtering element providing high impedance to the first resonant frequency to isolate it from the second resonance unit and low impedance to the second resonant frequency, enabling signal passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a monopole or PIFA antenna is designed to support multiple resonance frequencies, then the antenna can transmit or receive signals at various frequency bands, but the area or space of the circuit board needs to be large
Solution Approach 1:
The antenna is divided into multiple resonance units (first resonance unit, second resonance unit, third resonance unit) that are spatially separated and connected through filtering elements. Each resonance unit can be independently optimized for specific frequency bands, allowing multi-frequency support without requiring a large continuous area on the circuit board.
Solution Approach 2:
Filtering elements are introduced as intermediary components between the resonance units. These filtering elements selectively connect different resonance units at different frequencies, enabling compact integration of multiple resonance units while maintaining their individual frequency characteristics. The filtering elements act as mediators that allow signal passage at desired frequencies while blocking unwanted frequencies.
2Length of stationary object
If the dimensions of the monopole or PIFA antenna are reduced to meet the quarter-wavelength requirement, then the antenna size is minimized, but the antenna cannot support multiple resonance frequencies
Solution Approach 1:
Instead of requiring a single large antenna structure to support multiple frequencies, the antenna system is segmented into multiple smaller resonance units. Each unit can be compact in size while collectively providing broad frequency coverage through their combined resonance characteristics and selective coupling via filtering elements.
Solution Approach 2:
Multiple resonance units are arranged in a nested or hierarchical configuration where smaller resonance units are positioned within or near larger structural elements. This nesting approach allows compact integration of multiple frequency-supporting elements without requiring proportional increases in overall antenna dimensions.
3Ease of manufacture
If microstrip antenna techniques are used to achieve plane structure and low cost, then mass production and integration are facilitated, but the bandwidth is narrow
Solution Approach 1:
The microstrip antenna is segmented into multiple discrete resonance units that can be independently fabricated using standard microstrip techniques. This segmentation maintains the ease of mass production while enabling broader bandwidth through the combination of multiple resonant structures with different frequency characteristics.
Solution Approach 2:
Multiple microstrip resonance units are merged into a single integrated antenna system through the use of filtering elements and strategic positioning. The individual microstrip units retain their manufacturing simplicity while their combined operation provides enhanced bandwidth and multi-frequency support.
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 effectively reduces the size and weight of antennas while supporting multiple resonance frequencies, enhancing the efficiency of wireless communication devices by allowing for compact integration of communication modules.
Implementation Method 1
The first filtering element shows a high impedance towards the electronic signal with the first resonant frequency to prevent the first resonant frequency signal from entering the second resonance unit. Further, the first filtering element shows a low impedance towards the second resonant frequency signal, with the second resonant frequency signal being capable of passing through the first filtering element.
Implementation Method 2
The first resonance unit forms the first resonant frequency of the multi-frequency antenna. The first resonance unit, the first filtering element, and the second resonance unit jointly form the second resonant frequency of the multi-frequency antenna.
Data Source
AI summary
A multi-frequency antenna comprises a substrate disposed on a clearance area of a circuit board, and a first resonance unit and a second resonance unit located on the surface of the substrate or within the substrate. The first resonance unit is connected to a signal feeding terminal of the circuit board and connected to the second resonance unit via a first filtering element. The first resonance unit forms the first resonance frequency of the multi-frequency antenna, and the first resonance unit, the first filtering element, and the second resonance unit all together form the second resonant frequency. The first filtering element shows a high impedance towards the signal with the first resonant frequency and a low impedance towards the signal with the second resonant frequency. Thus, an antenna with multiple resonant frequencies can be obtained. The material and manufacturing costs of the multi-frequency antenna can thereby be reduced.