۱٫ Introduction

۲٫ Analysis of Implementation Method of Dual/multi-Frequency Antenna Unit

۳٫ Conclusion

۴٫ Acknowledgement

۵٫ References

The advent of dual/multi-band antennas has met the need for diversification of modern wireless communication functions. The left and right hand transmission lines have positive, zero and negative order resonant frequencies, and based on this characteristic, dual/multiple frequency antennas can be realized. This paper summarizes the application of the left and right hand transmission lines in the dual/multi-frequency antenna unit.

Introduction

In recent years, the rapid development of wireless communication systems has made the antenna for receiving and transmitting wireless signals a qualitative leap. In this development process, antennas have become more and more widely used, such as smart home systems; wearable wireless communication devices; smart mobile devices, and the rapid growth of the number of wireless communication users and the development and use of different communication frequency ranges. The above applications make antenna research continue to move toward broadband, dual-band and even multi-band. At the same time, the development of portable communication devices requires that the size of the antenna be as small as possible. Microstrip antennas have the advantages of low profile, small size, easy integration and easy implementation of multi-frequency. They are a vital member of the antenna family and have become one of the hotspots of current research. However, the bandwidth of the microstrip antenna is too narrow to meet the needs of some specific occasions. It is necessary to solve the problem that the bandwidth of the microstrip antenna is narrow and used in different frequency bands.