A Wide Stopband Filtering Patch Antenna and its Application in MIMO System

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Abstract
This paper presents a wide stopband filtering antenna element and its application in multi-input multi-output (MIMO) system. Microstrip terminated coupled lines (TCLs) and a rectangle patch are utilized to generate the filtering function. By varying the length of the parallel coupled lines and opencircuited stubs, multiple transmission zeros can be introduced in the spurious band. Appropriate positioning the location of these transmission zeros enables a wide harmonic suppression. To demonstrate the proposed method, a wide stopband filtering antenna is designed and further applied in a four-element MIMO array. The measured and simulated results agree well. The proposed MIMO antenna obtains an attenuation of 12.6 dB up to 6.6 times the center frequency.
Funding Information
  • Guangdong Provincial Key Laboratory of Short-Range Wireless Detection and Communication (2017B030314003)
  • National Natural Science Foundation of China (61571194)
  • Project of the Pearl River Young Talents of Science and Technology in Guangzhou (201610010095)
  • Fundamental Research Funds for the Central Universities (2018ZD07)

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