Abstract
The micro-strip antenna filter design of wireless sensor network nodes is usually used to improve the out-of-band suppression and frequency selectivity by increasing the order of the filters, but the filters are usually single band, not only the size is large, but also the in-band characteristics of the filters are not ideal. This paper proposes a method to design a micro-strip symmetric dual-band filter in wireless sensor network nodes. Firstly, the coupling matrix of single-passband filter is obtained by using the synthesis method of generalized Chebyshev filter function. Then, the coupling matrix of the dual-passband filter is generated according to the reflection zeros and the transmission zeros. Finally, the S parameters response curve is drawn by mapping the normalized frequency domain of the dual-passband to the actual frequency domain. According to the data analysis and experimental results, the method is feasible and effective to design a micro-strip symmetrical dual-band filter. It can not only provide a more guiding design method for the joint design of antenna and RF front-end circuit, but also realize the spread of single-passband filter to multi-frequency for a wireless sensor network node antenna.
Highlights
1 Introduction The traditional radio frequency (RF) transceiver system consists of antenna, filter, power amplifier, low noise amplifier, and other devices, which often work under a single communication standard
If multiple communication standards run at the same time, it requires multiple independenttransceiver systems to form a parallel working system which will be larger in size, high in power consumption and high in cost, and has been unable to meet the application needs of wireless sensor network nodes in the era of the big data, which has attracted the attention and widespread concern of researchers all over the world [1–13]
4 Conclusion This paper presented an experimental study on the micro-strip dual-band filter based on wireless sensor network nodes
Summary
The traditional radio frequency (RF) transceiver system consists of antenna, filter, power amplifier, low noise amplifier, and other devices, which often work under a single communication standard. Micro-strip filter is a very important component of wireless sensor network (WSN) nodes, which is used to select useful signals and suppress clutter interference on the parasitic frequency of resonators, a multi-band filter is designed. Traditional Butterworth, Chebyshev, and elliptic function filters can increase the design order of the filter to improve the filter’s out-of-band suppression and frequency selectivity, but the designed filter is usually single-band, the size is large, and the filter’s in-band characteristics are not ideal [36]. Generalized Chebyshev filter (GCF) is known as quasi-elliptic function filter. Based on the synthesis theory of generalized Chebyshev filter, the frequency transformation is carried out with low-frequency prototype, and the design from low-frequency prototype to dual-band filter is realized with a cross-coupling synthesis theory
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