Multi-band multi-mode end-fire antenna based on mirroring and scaling method

Abstract

One multi-functional antenna with multi-band multi-mode property based on mirroring and scaling method (MSM) is proposed in this letter. The design procession could be divided into three steps: firstly, one former periodic end-fire antenna with bowtie dipoles is mirrored on the same substrate; then the mirrored part is scaled into about two thirds of the original size; finally, parameters are optimized for fine tuning target. This antenna has three different radiation modes at three different bands respectively, i.e. one +y directional mode in the lower band, one −y directional mode in the higher band and one bidirectional mode along both ±y direction in-between the two bands. Both the field distribution and parameter analysis are given to explore the working principle. One prototype is fabricated for verification. With the advantages of planar structure, wide bandwidth and radiation pattern selectivity, the proposed antenna has a potential application in wireless communication system in the future.