ESPAR antenna, an early form of reconfigurable intelligence surfaces?

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Takashi Ohira

Dear Sun Chen, long time no see! I am glad to hear from you, and also that ESPAR is now on discussion from a new aspect. This is really thanks to your excellent work done at ATR wave engineering laboratory.

Regards, Takashi Ohira.

P.S. I am working on RF circuit theory. You can visit recent papers at

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9632515

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9217994

in which I believe you are interested.

Chen Sun

Dear Ohira-san,

Hopefully after the covid-19 I can visit Ohira-san. The ESPAR antenna was really a new direction created by Ohira-san. I was also very lucky to have the opportunity to investigate the ESPAR algorithms. Thank you for the latest papers. I will surely study the lasted papers of Ohira-san.