# US 11,309,834 B2 · High-power terahertz oscillator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,834 B2 - Document ID: US11309834B2 - Status: Granted - Kind: B2 - Application number: 17/290,811 - Filed: 2019-11-19 - Published: 2021-10-21 - Granted: 2022-04-19 - Earliest claimed: 2018-11-19 - Assignees: Tokyo Institute of Technology - Applicants: Tokyo Institute of Technology - Inventors: Masahiro Asada; Safumi Suzuki; Hiroki Tanaka - Web page: https://patentgrep.com/patent/US11309834B2 ## CPC - H01Q 23/00: Antennas with active circuits or circuit elements integrated within them or attached to them - H03B 5/1817: {the frequency-determining element being a cavity resonator} - H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)} - H01Q 9/28: Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines (waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00) - H03B 7/08: being a tunnel diode - H03B 7/14: active element being semiconductor device - H10D 8/70: Tunnel-effect diodes - H03B 2200/0084: dedicated to Terahertz frequencies - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H03B: GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (generators adapted for electrophonic musical instruments G10H; masers or lasers H01S; generation of oscillations in plasma H05H) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract A small-size high-power terahertz oscillator achieves a stable oscillation in a terahertz frequency band even at room temperature. The high-power terahertz oscillator has a structure in which a bow-tie antenna is disposed on a substrate, a cavity resonator, which includes two cavities, is disposed at a power supply portion of the bow-tie antenna, and a resonant tunneling diode (RTD) is disposed along a bottom of a wall of the cavity resonator, which defines the two cavities, and stably oscillates waves in the terahertz frequency band at room temperature by using the RTD, the bow-tie antenna and the cavity resonator. ## Claims ### Claim 1 A high-power terahertz oscillator, comprising: a bow-tie antenna, which includes first and second conductor strips, disposed on a substrate; a cavity resonator, which includes two cavities, disposed at an oscillating portion of said bow-tie antenna; a resonant tunneling diode, which is cuboid, disposed along a bottom of a wall which defines the two cavities; and an insulating thin film disposed between said first and second conductor strips of said bow-tie antenna, and disposed between a bottom of said cavity resonator and said second conductor strip of said bow-tie antenna, wherein said first conductor strip of said bow-tie antenna is integrated with said cavity resonator, and wherein an oscillation in a terahertz frequency band is obtained from said resonant tunneling diode, said bow-tie antenna and said cavity resonator, by applying a bias voltage between said second conductor strip of said bow-tie antenna and a side surface or a top surface of said cavity resonator connected to said first conductor strip of said bow-tie antenna. ### Claim 2 (depends on 1) The high-power terahertz oscillator according to claim 1, wherein a bottom surface of said resonant tunneling diode is in contact with a top surface of said second conductor strip of said bow-tie antenna. ### Claim 3 (depends on 1) The high-power terahertz oscillator according to claim 1, wherein said first and second conductor strips of said bow-tie antenna and said cavity resonator are made of a good conductor, and said substrate is made of a semi-insulator. ### Claim 4 (depends on 2) The high-power terahertz oscillator according to claim 2, wherein said first and second conductor strips of said bow-tie antenna and said cavity resonator are made of a good conductor, and said substrate is made of a semi-insulator. ### Claim 5 (depends on 1) The high-power terahertz oscillator according to claim 1, wherein a recess is formed at said second conductor strip of said bow-tie antenna, a conductor bridge extending from said cavity resonator is connected to an upper surface of said substrate in the recess, and a stabilizing resistor is connected between said conductor bridge and a side surface of said second conductor strip of said bow-tie antenna. ### Claim 6 (depends on 2) The high-power terahertz oscillator according to claim 2, wherein a recess is formed at said second conductor strip of said bow-tie antenna, a conductor bridge extending from said cavity resonator is connected to an upper surface of said substrate in the recess, and a stabilizing resistor is connected between said conductor bridge and a side surface of said second conductor strip of said bow-tie antenna. ### Claim 7 (depends on 3) The high-power terahertz oscillator according to claim 3, wherein a recess is formed at said second conductor strip of said bow-tie antenna, a conductor bridge extending from said cavity resonator is connected to an upper surface of said substrate in the recess, and a stabilizing resistor is connected between said conductor bridge and a side surface of said second conductor strip of said bow-tie antenna. ### Claim 8 (depends on 4) The high-power terahertz oscillator according to claim 4, wherein a recess is formed at said second conductor strip of said bow-tie antenna, a conductor bridge extending from said cavity resonator is connected to an upper surface of said substrate in the recess, and a stabilizing resistor is connected between said conductor bridge and a side surface of said second conductor strip of said bow-tie antenna.