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A nonuniform array of slots in the broad‐walls of rectangular waveguides partially filled with dielectric slabs
Author(s) -
Zheng Boyu,
Shen Zhongxiang
Publication year - 2008
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20289
Subject(s) - side lobe , broadside , slot antenna , optics , antenna array , antenna (radio) , microwave , broadband , materials science , dielectric , main lobe , waveguide , radiation pattern , acoustics , physics , telecommunications , optoelectronics , engineering
This article describes a new nonuniform slot antenna array in the broad wall of rectangular waveguides partially filled with a dielectric slab. The slot elements are nonuniformly spaced to achieve a higher side lobe level while the amplitude and phase of their excitations are identical. Each slot element is fed by one dielectric‐loaded rectangular waveguide with one end shorted for structural simplicity. Experimental results for an 8‐element linear slot array operating at X‐band show that the side lobe level is 15 dB over a frequency range from 9.5 GHz to 10.5 GHz. The simulated side lobe level can reach 20 dB for a 16‐element linear array. Experimental results show that the side lobe level of a slot array can be improved using nonuniform element spacing without degrading the broadside radiation and gain. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008.