Open AccessHexa‐band SIW cavity antenna system integrating two antennas with high isolation
Author(s) -
Niu BingJian,
Tan JieHong
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2019.0266
Subject(s) - hexa , antenna (radio) , slot antenna , directional antenna , isolation (microbiology) , physics , engineering , electrical engineering , biology , biochemistry , microbiology and biotechnology
A hexa‐band substrate integrated waveguide (SIW) cavity antenna system integrating two antennas with high isolation is proposed. A square SIW cavity is divided by a wide slot into two half sub‐cavities. Two narrow slots are etched in the upper sub‐cavity and other two slots are cut in the lower sub‐cavity to achieve multi‐band operation. Six half‐mode resonances with different sizes can occur in a single cavity. They are excited by two coaxial ports to form two integrated antennas. A fabricated sample with the overall size of 0.63 λ 0 × 0.63 λ 0 has been measured. The measured frequencies excited by port 1 are 2.31 GHz ( f 1 ), 2.91 GHz ( f 2 ), and 3.35 GHz ( f 3 ). The resonating frequencies excited by port 2 are 2.57 GHz ( f 4 ), 3.11 GHz ( f 5 ), and 3.61 GHz ( f 6 ). The measured gain and efficiency at the above frequencies are higher than 5 dBi and 72%, respectively. Moreover, the measured isolation between these integrated antennas is better than 22 dB within the frequency of interest. The proposed antenna system offers advantages of compact size, hexa‐band operation, high isolation, and unidirectional radiation, which has potential applications in multi‐standard wireless systems.