Design of a Multi-band Microwave and Millimeter-Wave 4-bit Step Attenuator for Phased Arrays

The design of a 22-29/57-64-GHz concurrent dual-band CMOS 4-bit step attenuator with small phase variations is presented. An integrated diplexer-attenuator possessing both attenuation and diplexer filtering functions is used to achieve the concurrent dual-band response in the attenuator design. The concurrent dual-band attenuator also includes a distributed attenuator configured to result in small phase variation.