This paper presents wideband split-ring antenna arrays based on substrate integrated waveguide (SIW) for Ka-band (26.5–40 GHz) applications. The antenna array is fed by a 2.92 mm coaxial connector (K-connector) and the power is equally distributed to each split-ring resonator. The designed coplanar waveguide (CPW), SIW, CPW-to-SIW transition, coaxial-to-CPW transition, and two-stage SIW power divider are described in detail. By using a thin Rogers 6002 substrate with silver epoxy-filled vias, a transition prototype is designed, fabricated, and tested in a back-to-back configuration. A wideband split-ring resonator is developed as a single element and four possible arrangements of antenna arrays are introduced. By combining the designed components and routing paths, two full layouts of the antenna arrays with four split-ring resonators are addressed. As a demonstrator, a 2×2 antenna array prototype in a compact format is designed, fabricated, and tested. The fabricated antenna array achieves a measured directivity of 15.0 dBi with a fractional bandwidth of 23.0% centered at 30.5 GHz.
This paper presents the design of a transition at D-band (110-170 GHz) between rectangular waveguide and coplanar waveguide (CPW) using wideband patch antenna. With the rectangular ring structure, the proposed patch antenna is specialized for high gain and large bandwidth which can be used for wireless chip-to-chip communication or implemented as a rectangular waveguide-to-CPW transition. A simulated gain of 7.4 dBi with 36% bandwidth centered at 140 GHz is achieved. The fabricated rectangular waveguide-to-CPW transition in a back-to-back configuration exhibits a bandwidth of 42.2 GHz at D-band. From 118.8 GHz to 161 GHz, the return loss is better than 10 dB and each fabricated rectangular waveguide-to-CPW transition introduces less than 2 dB insertion loss.
This paper presents two types of coplanar transitions based on aluminum nitride (AlN) substrate for interposer designs of terabit transceivers. The designs of coupled coplanar waveguide (CCPW), coupled line, coplanar waveguide (CPW), and coplanar stripline (CPS) based on AlN substrate are explained. The effects of absorber layer and wire bonding bridges are described. Two types of coplanar transitions are designed and simulated in back-to-back configuration with wire bonding bridges. When driven by differential signal pair, the proposed CCPW-to-coupled line transition in back-to-back configuration with wire bonding bridges achieves a simulated return loss of 11 dB and insertion loss of 2 dB up to 110 GHz. As for single-ended signals, a CPW-to-CPS transition in back-to-back configuration with wire bonding bridges has been designed, fabricated, and measured. The fabricated CPW-to-CPS transition can provide a-3 dB transmission bandwidth up to 80 GHz with associated return loss better than 12 dB.
This paper presents the system integration and packaging of a photodetector at W-band (75-110 GHz) for terahertz (THz) communications. The ErAs:In(Al)GaAs photoconductor and its feeding network based on semi-insulating indium phosphide (InP) substrate are introduced. The design of the bias-tee at W-band is described and the effect of parasitic modes is discussed. Besides, the transition using E-plane probe between a W-band rectangular waveguide (WR-10) and a coplanar waveguide (CPW) is illustrated. The bias-tee as well as the E-plane probe transition are based on high-resistivity silicon (Si) substrate where wire bonding bridges are added on the top following the CPWs in order to restrict parasitic modes. The integration approach and the packaging structure are addressed. The proposed bias-tee and the E-plane probe transition including the WR-10 rectangular waveguide are fabricated, integrated, and measured. The measurement is carried out on-wafer in a back-to-back configuration and the results are presented. The assembly of the fully-packaged photodetector is demonstrated and a THz heterodyne communication system is implemented which validates the proposed system integration and packaging approach of the photodetector at W-band.
Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.