A Two dimensional active Van Atta retrodirective 2x2 array is designed using dual port dual polarized microstrip square patch antenna at a frequency of 2 GHz. The dual polarized microstrip antenna is designed using aperture coupled feeding technique in a double-substrate structure. This structure facilitates the assembly of the RFIC amplifiers layer with the patch antenna layer. The Monostatic Radar Cross Section for the proposed structure is presented. The proposed array configuration achieved excellent cross-polarized monostatic RCS within ±55º compared to other recent publications. In addition, the cross-polarized level of the array is easily distinguished from that of the flat plate by greater than 30 dB. The proposed structure promises enhancement in the cross polarization level of the array.
Abstract-This paper presents a novel quad-band power divider with equal power division ratio. The proposed power divider is realized using two cascaded sections of dual-band transformers based on coupled microstrip lines. Limitations of using dual-band quarterwavelength transformers based on coupled lines are studied through parametric analysis to obtain useful design guidelines related to available fabrication facilities. General closed-form expressions are deduced to calculate design parameters. To verify analysis and design methodologies, a prototype of quad-band equal power divider is proposed. Compared to conventional quad-band power dividers using sections of transmission line transformers, the proposed power divider records a size reduction of about 20% and reduced parasitic effects at higher frequencies according to the usage of only two resistors instead of four with much smaller ohmic values. In addition, a quad-band power divider is proposed, fabricated and measured for 3G and 4G applications at 2.1, 2.5, 3.5, and 3.8 GHz frequencies. Measured and simulated data are in very good agreement which validates the novel design.
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