University of Michigan

Seyed Mohammad Amjadi

Kamal Sarabandi

A broadband, dual-polarized, cavity-backed slot antenna (CBSA) array is presented for enabling full-duplex wireless communication. The antenna consists of a thin rectangular cavity appropriately loaded with metallic septa to excite multiple resonances of similar desired field distribution to achieve consistent radiation characteristics over a wide bandwidth. Four pairs of orthogonal radiating slots are cut out on one of the broad-walls of the cavity; all of which are fed by two orthogonal slots on the opposite broad-wall of the cavity. The cavity is fed by an end-launch coaxial-to-waveguide transition to excite one of the channels. The other channel is excited by a two-pronged microstrip line symmetrically crossing over the other cavity feeding slot. Due to the out-of-phase coupling from the two prongs of the microstrip line to the other port, this type of excitation is shown to provide an unpredicted level of isolation between the two channels over a wide bandwidth.

Broadband, low profile, high isolation, two-port antenna

A borehole drilling communication system that includes a hydraulic drill, a communication module, and a transducer. The hydraulic drill has a drill pipe and a drill head where the communication module is located, The transducer has an input end and is mounted on the drill pipe adjacent the communication module. The communication module includes a first output terminal electrically connected to the drill pipe and a second output terminal electrically connected to the input end of the transducer. The transducer includes a helical conductor that is positioned coaxially over a section of the drill pipe at the drill head, with the helical conductor terminating at an electrically isolated free end. During use in borehole drilling, data sent from the communication module is launched by the transducer and transmitted along the drill pipe as a single conductor transmission line.

Growing community of inventors

Ypsilanti, MI, United States of America

Seyed Mohammad Amjadi