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A low‐profile half‐mode substrate‐integrated waveguide antenna with frequency and radiation pattern reconfigurable characteristics
Author(s) -
Zhou Jinzhi,
Yang Ming
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32715
Subject(s) - radiation pattern , optics , materials science , radiation , antenna gain , optoelectronics , ground plane , bandwidth (computing) , reconfigurable antenna , antenna (radio) , antenna efficiency , physics , electrical engineering , telecommunications , engineering
Based on half‐mode substrate‐integrated waveguide (HMSIW) cavity, a low‐profile antenna with frequency and radiation pattern reconfigurable characteristics is proposed in this article. A metal layer is printed on the bottom of the HMSIW cavity, which works as an extend ground plane. The resonance frequency, radiation gain and front‐to‐back ratio (FBR) of the HMSIW antenna are extremely sensitive to the dimension of the bottom layer, which consists of the original ground plane and the extended portion. Three PIN diodes are installed on the back of the antenna to change the length of the bottom metal layer. Attribute to the variable metal layer at the bottom of the antenna, two resonant modes with different radiation patterns are obtained. Meanwhile, an E‐shaped patch is also placed at the radiating edge of the HMSIW cavity to improve the impedance matching. In order to verify the reconfigurable features, a low‐profile HMSIW antenna is fabricated and tested. The measured results show that the designed antenna has two working states, which are basically agreement with the simulated results. Among them, the resonance bandwidth of state I is 4.99 to 5.05 GHz with a maximum gain of 3.6 dBi and an average efficiency of 78.6%. Similarly, the resonant bandwidth of state IІ is 5.14 to 5.19 GHz with a peak gain of 5.3 dBi and an average radiation efficiency of 87.4%. Moreover, the measured results of radiation pattern also exhibit the reconfigurable characteristics from quasi‐omnidirectional to directional in xoz plane.