Patents by Inventor Ulrich L. Rohde

Ulrich L. Rohde has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220294120
    Abstract: A frequency selective surface (FSS) having periodicity between one eighth and one quarter of an operational wavelength of the FSS and a low profile. The FSS has multiple pattern elements which are used to produce multiple transmission poles, and in some embodiments multiple transmission zeros. The transmission poles and transmission zeros are in the Ka and Ku bands, making the FSS applicable to 5G application. The transmission poles and transmission zeros also have high angular stability an oblique incident angle as high as 60°, as well as polarization insensitivity.
    Type: Application
    Filed: March 10, 2021
    Publication date: September 15, 2022
    Applicant: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Sukomal Dey, Ulrich L. Rohde
  • Publication number: 20220294107
    Abstract: An electromagnetic bandgap (EBG) structure for improving isolation characteristics between antennas of a MIMO antenna array. The structure includes an EBG unit cell formed on a metal layer over a composite dielectric substrate and over a ground plane. The ground plane may include a defected ground structure to further improve isolation, and another metal layer including a substrate integrated waveguide may be included at an interface of the composite dielectric substrate.
    Type: Application
    Filed: March 10, 2021
    Publication date: September 15, 2022
    Applicant: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Sukomal Dey, Ulrich L. Rohde
  • Publication number: 20220060163
    Abstract: A tunable passband filter including a signal input port for receiving an input radio frequency (RF) signal, a signal output port for transmitting a filtered output RF signal, a first high-pass section having a first tunable microelectromechanical system (MEMS) switch array to receive the input RF signal from the signal input port, a second high-pass section having a second tunable MEMS switch array to transmit the output RF signal to the signal output port, and a low pass section operatively coupled between the first high-pass section and the second high-pass section, and having each of a first tunable MEMS bridge array, a second tunable MEMS bridge array, and a high impedance line. The tunable passband filter is configured to filter the input RF signal to yield the filtered output RF signal.
    Type: Application
    Filed: April 5, 2021
    Publication date: February 24, 2022
    Applicant: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Sukomal Dey, Ulrich L. Rohde
  • Publication number: 20220021123
    Abstract: An electromagnetic energy absorber comprising a thin electrically-conductive ground plane as a base. Dielectric layers are positioned over the ground plane and high impedance surface (HIS) as a top layer. The impedance layer can be formed by loading the lumped resistor to a metallic grating like an FSS (Frequency Selective Surface). An air-spacer between the substrates has replaced the problem of the large electrical thickness of the substrate with effective permittivity. Metamaterial structures enable control over the resonant frequencies, and performance is enhanced over a broad frequency band. In addition, two broadband reflective-type linear to orthogonal polarization converters are disclosed that provide improved bandwidth and angular stability performance.
    Type: Application
    Filed: May 6, 2021
    Publication date: January 20, 2022
    Applicant: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Sukomal Dey, Ulrich L. Rohde
  • Publication number: 20210384613
    Abstract: The present disclosure provides several embodiments of integrated conformal antennas that are designed to be integrated into handheld devices and support operation at millimeter-wave operating frequency band that includes 28 GHz. The antennas have low mutual coupling despite close proximity, and maintain a front-to-back radiation ratio of 10 dB or better within the operating frequency band. The integrated conformal antennas are further capable of supporting operation of the device in different orientations, different forward gains, or a combination thereof.
    Type: Application
    Filed: April 5, 2021
    Publication date: December 9, 2021
    Applicant: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Karthikeya Gulur Sadananda, Ulrich L. Rohde
  • Publication number: 20210167578
    Abstract: A tunable multi-mode laser is configured to generate a multi-mode optical signal at a tuned wavelength. The laser includes a semiconductor optical gain region, a feedback region, and a phase modulation region between the gain and feedback regions. Each of the regions may be monolithically integrated. A feedback loop is coupled to the tunable laser to receive the optical signal and includes at least one delay line. The delay line may also be monolithically integrated. An output of the delay line is fed back to the tunable multi-mode laser in order to provide at least one of self-injection locking and self-phase locked looping for the multi-mode tunable laser. Each of the optical gain region and phase modulation region of the laser is biased by the output of the delay line in order to reduce phase drift of the optical signal.
    Type: Application
    Filed: July 24, 2019
    Publication date: June 3, 2021
    Applicant: Synergy Microwave Corporation
    Inventors: Ajay Kumar Poddar, Ulrich L. Rohde, Afshin S. Daryoush
  • Patent number: 10784066
    Abstract: A microelectromechanical switch having improved isolation and insertion loss characteristics and reduced liability for stiction. The switch includes a signal line having an input port and an output port between first and second ground planes. The switch also includes a beam for controlling activation of the switch. In some embodiments, the switch further includes one or more defected ground structures formed in the first and second ground planes, and a corresponding secondary deflectable beam positioned over each defected ground structure. In some embodiments, the switch includes a metamaterial structure for generating a repulsive Casimir force.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: September 22, 2020
    Assignee: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Ulrich L. Rohde
  • Patent number: 10325742
    Abstract: The present disclosure provides for a microelectromechanical switch including a first port (e.g., input port), one or more second ports (e.g., output ports), a cantilever beam, and a mechanical spring connected to the cantilever beam for providing a mechanical force to move the cantilever beam. The cantilever beam extends from a first end, which is in contact with either the first port or one of the second ports, to a second end that is switchably connectable to the other of the first port or said one of the second ports. The first and second ports and cantilever beam may be formed in a coplanar waveguide.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: June 18, 2019
    Assignee: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Sukomal Dey, Ulrich L. Rohde
  • Patent number: 10199703
    Abstract: The present disclosure provides for a phase shifter having at least one phase shift section. The phase shift section includes an input port for receiving an incoming radio frequency signal, an output port for transmitting an outgoing radio frequency signal, an input junction coupled to the input port, an output junction coupled to the output port, and a plurality of transmission lines. The input junction includes a first plurality of cantilever type switches, and the output junction includes a second plurality of cantilever type switches. Each transmission line connects one of the first plurality of cantilever type switches to a corresponding one of the second plurality of cantilever type switches. The first plurality of cantilever type switches, the second plurality of cantilever type switches, and the plurality of transmission lines are formed in a coplanar waveguide.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: February 5, 2019
    Assignee: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Sukomal Dey, Ulrich L. Rohde
  • Patent number: 10135106
    Abstract: The present disclosure is directed to a balun circuit adapted to operate at a frequency of between about 5 GHz to about 110 GHz. The balun circuit includes first and second output striplines and an input stripline formed on a first surface of the substrate, and a slotline formed on a second surface of the substrate opposite the first surface. The slotline has first and second ends, the first end overlapping the first output stripline and the second end overlapping the second output stripline, and the input stripline overlapping the slotline midway between the first end and the second end.
    Type: Grant
    Filed: February 7, 2018
    Date of Patent: November 20, 2018
    Assignee: Synergy Microwave Corporation
    Inventors: Ajay Kumar Poddar, Ulrich L. Rohde, Shiban K. Koul
  • Publication number: 20180261415
    Abstract: A microelectromechanical switch having improved isolation and insertion loss characteristics and reduced liability for stiction. The switch includes a signal line having an input port and an output port between first and second ground planes. The switch also includes a beam for controlling activation of the switch. In some embodiments, the switch further includes one or more defected ground structures formed in the first and second ground planes, and a corresponding secondary deflectable beam positioned over each defected ground structure. In some embodiments, the switch includes a metamaterial structure for generating a repulsive Casimir force.
    Type: Application
    Filed: March 9, 2018
    Publication date: September 13, 2018
    Applicant: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Ulrich L. Rohde
  • Publication number: 20180166764
    Abstract: The present disclosure is directed to a balun circuit adapted to operate at a frequency of between about 5 GHz to about 110 GHz. The balun circuit includes first and second output striplines and an input stripline formed on a first surface of the substrate, and a slotline formed on a second surface of the substrate opposite the first surface. The slotline has first and second ends, the first end overlapping the first output stripline and the second end overlapping the second output stripline, and the input stripline overlapping the slotline midway between the first end and the second end.
    Type: Application
    Filed: February 7, 2018
    Publication date: June 14, 2018
    Applicant: Synergy Microwave Corporation
    Inventors: Ajay Kumar Poddar, Ulrich L. Rohde, Shiban K. Koul
  • Publication number: 20170187086
    Abstract: The present disclosure provides for a phase shifter having at least one phase shift section. The phase shift section includes an input port for receiving an incoming radio frequency signal, an output port for transmitting an outgoing radio frequency signal, an input junction coupled to the input port, an output junction coupled to the output port, and a plurality of transmission lines. The input junction includes a first plurality of cantilever type switches, and the output junction includes a second plurality of cantilever type switches. Each transmission line connects one of the first plurality of cantilever type switches to a corresponding one of the second plurality of cantilever type switches. The first plurality of cantilever type switches, the second plurality of cantilever type switches, and the plurality of transmission lines are formed in a coplanar waveguide.
    Type: Application
    Filed: December 27, 2016
    Publication date: June 29, 2017
    Applicant: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Sukomal Dey, Ulrich L. Rohde
  • Publication number: 20170186578
    Abstract: The present disclosure provides for a microelectromechanical switch including a first port (e.g., input port), one or more second ports (e.g., output ports), a cantilever beam, and a mechanical spring connected to the cantilever beam for providing a mechanical force to move the cantilever beam. The cantilever beam extends from a first end, which is in contact with either the first port or one of the second ports, to a second end that is switchably connectable to the other of the first port or said one of the second ports. The first and second ports and cantilever beam may be formed in a coplanar waveguide.
    Type: Application
    Filed: December 27, 2016
    Publication date: June 29, 2017
    Applicant: Synergy Microwave Corporation
    Inventors: Shiban K. Koul, Ajay Kumar Poddar, Sukomal Dey, Ulrich L. Rohde
  • Patent number: 9608564
    Abstract: The present disclosure is directed a metamaterial circuit may further be coupled to a möbius strip resonator or a substrate integrated waveguide. The disclosure is also directed to a device having a tuning circuit and a metamaterial resonator operatively coupled to the tuning circuit. The metamaterial resonator operatively coupled to the tuning circuit may likewise be coupled to a möbius strip resonator or a substrate integrated waveguide.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: March 28, 2017
    Assignee: Synergy Microwave Corporation
    Inventors: Ajay Kumar Poddar, Ulrich L. Rohde
  • Publication number: 20150303870
    Abstract: The present disclosure is directed a metamaterial circuit may further be coupled to a möbius strip resonator or a substrate integrated waveguide. The disclosure is also directed to a device having a tuning circuit and a metamaterial resonator operatively coupled to the tuning circuit. The metamaterial resonator operatively coupled to the tuning circuit may likewise be coupled to a möbius strip resonator or a substrate integrated waveguide.
    Type: Application
    Filed: April 7, 2015
    Publication date: October 22, 2015
    Applicant: SYNERGY MICROWAVE CORPORATION
    Inventors: Ajay Kumar Poddar, Ulrich L. Rohde
  • Patent number: 9094133
    Abstract: The present invention details fabrication guidelines of integrated optoelectronic oscillators with frequency and phase stability, having higher frequency selectivity in a relatively small size (compared to the larger size of a higher order electrically realized RF filter), reduced temperature sensitivity, and minimized frequency drift. The integrated photonic components and RF oscillator may use Silicon photonics and microelectronic integration using CMOS and BiCMOS technology, eliminating the need for bulky and/or discrete optical and microwave components.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: July 28, 2015
    Assignee: Synergy Microwave Corporation
    Inventors: Ajay Kumar Poddar, Ulrich L. Rohde, Afshin S. Daryoush
  • Patent number: 9088369
    Abstract: Aspects of the disclosure relate generally to a circuit for sustaining an radio frequency (RF) modulated optical signal. The circuit may comprise a self injection locking component having a fiber optic delay line over which a portion of the optical signal propagates. The circuit may also comprise a self phase locked loop component having at least two fiber optic cables having different lengths and over which another portion of the optical signal propagates and a phase detector coupled to the at least two fiber optic cables and configured to determine a phase difference between the signals propagating over one of the respective fiber optic cables. The circuit may further comprise a voltage controlled oscillator configured to generate a stable oscillating signal in response to signals generated by each of the self injection locking and self phase locked loop components, the stable oscillating signal being configured to sustain the optical signal.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: July 21, 2015
    Assignee: Synergy Microwave Corporation
    Inventors: Ajay Kumar Poddar, Ulrich L. Rohde, Afshin S. Daryoush
  • Patent number: 7636021
    Abstract: A voltage controlled oscillator compising a distributed coupled resonator (DCR) that desirably produces a low noise signal source with reduced phase hits in comparison to a high Q resonator, such as a ceramic and SAW (Surface Acoustic Wave) resonator based oscillator.
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: December 22, 2009
    Assignee: Synergy Microwave Corporation
    Inventors: Ulrich L. Rohde, Ajay Kumar Poddar, Klaus Juergen Schoepf, Reimund Rebel, Hua Zhang
  • Patent number: 7605670
    Abstract: An aspect of the present invention is a voltage controlled oscillator that provides multi octave band tenability. The oscillator preferably includes one or more multi planar resonators which allow it to be implemented in integrated circuit form. Oscillators implemented in accordance with the aspect of the present invention provide as wide a tuning range as the YIG based resonators but are much more compact and efficient. Therefore, they are amenable to implementation in integrated circuits and suited for adaptation in third and future generation wireless devices.
    Type: Grant
    Filed: November 15, 2006
    Date of Patent: October 20, 2009
    Assignee: Synergy Microwave Corporation
    Inventors: Ulrich L. Rohde, Ajay Kumar Poddar, Klaus Juergen Schoepf, Parimal Patel