Fujikura Limited

International Business Machines Corporation

Yo Yamaguchi

Kiyoshi Kobayashi

Alberto Valdes Garcia

Bodhisatwa Sadhu

Jean-Olivier Plouchart

Ning Guan

Yusuke Uemichi

Xiaoxiong Gu

Arun Paidimarri

Christian Wilhelmus Baks

Yoshiharu Fujisaku

Chihiro Kamidaki

Tatsuo Kubo

A digital phase shifter includes a plurality of digital phase shift circuits connected in cascade and one or more bend-type connection units each configured to make a connection between two digital phase shift circuits of the plurality of digital phase shift circuits. Each of the digital phase shift circuits includes at least a signal line, a pair of inner lines provided at both sides of the signal line, a pair of outer lines provided outside of the inner lines, a first ground conductor connected to one ends of the inner lines and the outer lines, a second ground conductor connected to the other ends of the outer lines, and a pair of electronic switches provided between the other ends of the inner lines and the second ground conductor. Each of the digital phase shift circuits is a circuit set in a low-delay mode in which a return current flows through the inner line or a high-delay mode in which a return current flows through the outer line. The plurality of digital phase shift circuits connected in cascade are arranged in a spiral shape via the connection units.

Digital phase shifter

A filter circuit () includes a first transmission line (), a second transmission line () which has an electrical length set to ½ of an electrical length of the first transmission line, a first capacitor (), a second capacitor (), and a third capacitor (). Capacitances of the first capacitor, the second capacitor, and the third capacitor are set in such a manner that a circuit including the first transmission line, the second transmission line, and the first capacitor resonates in series at a predetermined fundamental frequency, a circuit including the first transmission line, the first capacitor, and the second capacitor resonates in parallel at a third harmonic frequency being a tripled frequency of the fundamental frequency, and a circuit including the second transmission line and the third capacitor resonates in series at the third harmonic frequency.

Filter circuit

A frequency converter up-converts a transmission signal in an intermediate frequency hand into a signal in a wireless frequency hand as a USB or an LSR of a local oscillation signal using the local oscillation signal. When PMhigh−1/2×IFwid≤RFtx≤PMhigh−1/2×CHwid, the frequency converter is configured to satisfy ωLO=PMhigh−1/2×Fwid−IFcent and IFtx=RFtx−ωLO. Alternatively, when PMlow+1/2×IFwid≥RFtx≥PMlow+1/2×CHwid, the frequency converter is configured to satisfy ωLO=PMlow+1/2×IFwid+IFcent and IFtx=ωLO−RFtx.

Frequency converter and wireless device

A phased array antenna includes an antenna array substrate having a plurality of antenna elements. At least two beamformers are coupled to the plurality of antenna elements. At least two filters support different frequency bands and are respectively coupled to the at least two beamformers. A frequency converter is coupled to the at least two filters, the frequency converter including one intermediate frequency (IF) port and at least two radio frequency (RF) ports. The one IF port of the frequency converter is configured to support the at least two beamformers via the at least two RF ports. A first beamformer of the at least two beamformers is coupled to a first filter of the at least two filters to form a first beam in a direction different than a second beamformer of the first two beamformers coupled to a second filter of the at least two filters.

Phased array system-in package supporting spatio-spectral division multiplexing

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Chiba, Japan

Yo Yamaguchi