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Low‐profile SIW cavity antenna with enhanced bandwidth and controllable radiation null
Author(s) -
Niu BingJian,
Tan JieHong
Publication year - 2020
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.32249
Subject(s) - radiation pattern , bandwidth (computing) , stopband , passband , optics , radiation , sideband , physics , optoelectronics , materials science , antenna (radio) , electrical engineering , resonator , engineering , telecommunications , radio frequency , band pass filter
A low‐profile substrate‐integrated‐waveguide (SIW) cavity antenna with enhanced bandwidth and a controllable radiation null is proposed. Serving as radiating elements, two slots are etched on a square SIW cavity. Four cavity modes including a fundamental mode (FM), a half mode (HM), and two quarter modes (QMs) are excited by a capacitively coupled feeding disc. Their frequencies can be controlled by adjusting positions of the slots and disc. Three radiating modes (ie, a HM and two QMs) are utilized to realize an antenna passband with enhanced bandwidth while a nonradiating mode (ie, the FM) is utilized to achieve a radiation null resulting in the sharp upper sideband and high stopband suppression. Experimental results show that the fabricated antenna with the profile of less than 0.04 λ 0 obtains the bandwidth of 440 MHz, gain of 5.24 dBi, and efficiency of 84%. However, the gain sharply drops to −22.07 dBi and the efficiency achieves a very low value of 0.15% at the radiation null. Due to covering the frequency band of 3.40‐3.60 GHz, the proposed design has potential applications for fifth‐generation (5G) wireless systems.

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