Patents by Inventor Efstratios Doumanis

Efstratios Doumanis 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).

  • Patent number: 11996638
    Abstract: An antenna system comprising: a ground plane; an antenna radiator separated from and overlapping the ground plane; at least one feed element configured to provide a radio-frequency feed for the antenna radiator; and at least one resonator coupled to the feed element and positioned in a space between the ground plane and the antenna radiator, wherein the antenna radiator is a broadband antenna radiator having a first operational range of frequencies and the resonator is a narrow band resonator having a second range of resonant frequencies that at least partially lie within the first operational range of frequencies.
    Type: Grant
    Filed: November 23, 2021
    Date of Patent: May 28, 2024
    Assignee: NOKIA SOLUTIONS AND NETWORKS OY
    Inventors: Efstratios Doumanis, Murat Emre Ermutlu
  • Publication number: 20230395964
    Abstract: A resonator is described including: a first part of a metal cavity; a first ring extending from the first part of the metal cavity, wherein at least part of an external surface of the first supporting ring is coated with a first metal coating that provides an electrical connection to the metal cavity; a second part of the metal cavity; and a ceramic ring extending from the second part of the metal cavity. At least part of an external surface of the ceramic ring is coated with a second metal coating that provides an electrical connection to the metal cavity, wherein the first and second parts are mounted to form the metal cavity such that the first ring and the ceramic ring partially overlap such that at least part of the ceramic ring is between at least parts of the first and second metal coatings.
    Type: Application
    Filed: October 22, 2021
    Publication date: December 7, 2023
    Inventor: Efstratios DOUMANIS
  • Publication number: 20230291084
    Abstract: Arrangements for a frequency adjustable filter, which includes at least a housing, which includes one or more cavities closed by a lid above the housing are disclosed. In an arrangement, there is, per a cavity forming a resonator, a first resonator element extending from the lid, a second resonator element extending from the bottom, the second resonator element partially overlapping the first resonator element, an adjusting bar extending inside an area in which the first and the second resonator elements are overlapping, the adjusting bar being arranged to move within said area, a first hole either in the lid or in the bottom, a driving shaft, and an actuator arranged to move the adjusting bar through the first hole by means of the driving shaft. At least the first resonator element, the second resonator element and the adjusting bar are positioned to have a common vertical central axis.
    Type: Application
    Filed: March 1, 2023
    Publication date: September 14, 2023
    Inventors: Efstratios Doumanis, Jaakko Petteri Vuorio, Kari Johannes Hautio, Oskari Amper
  • Patent number: 11527830
    Abstract: An antenna system including a ground plane, an antenna radiator separated from and overlapping the ground plane and at least one first conductive element extending the antenna radiator towards the ground plane. The antenna system also includes at least one feed element configured to provide a radio-frequency feed for the antenna radiator. The feed element is spatially separated from the first conductive element and the antenna radiator.
    Type: Grant
    Filed: January 26, 2021
    Date of Patent: December 13, 2022
    Assignee: NOKIA SOLUTIONS AND NETWORKS OY
    Inventors: Efstratios Doumanis, Murat Emre Ermutlu
  • Publication number: 20220166133
    Abstract: An antenna system comprising: a ground plane; an antenna radiator separated from and overlapping the ground plane; at least one feed element configured to provide a radio-frequency feed for the antenna radiator; and at least one resonator coupled to the feed element and positioned in a space between the ground plane and the antenna radiator, wherein the antenna radiator is a broadband antenna radiator having a first operational range of frequencies and the resonator is a narrow band resonator having a second range of resonant frequencies that at least partially lie within the first operational range of frequencies.
    Type: Application
    Filed: November 23, 2021
    Publication date: May 26, 2022
    Applicant: NOKIA SOLUTIONS AND NETWORKS OY
    Inventors: Efstratios DOUMANIS, Murat Emre ERMUTLU
  • Patent number: 11121445
    Abstract: A resonator for radio frequency, RF, signals, said resonator comprising a cavity having a longitudinal axis, a first wall, at least one side wall, and a lid arranged opposite the first wall, wherein said resonator further comprises a guiding device which is arranged at said at least one side wall and is configured to guide an axial movement of said lid along said longitudinal axis.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: September 14, 2021
    Assignee: Nokia Solutions and Networks OY
    Inventors: Efstratios Doumanis, Murat Emre Ermutlu, Juha Olli Jokilahti
  • Publication number: 20210234271
    Abstract: An antenna system including a ground plane, an antenna radiator separated from and overlapping the ground plane and at least one first conductive element extending the antenna radiator towards the ground plane. The antenna system also includes at least one feed element configured to provide a radio-frequency feed for the antenna radiator. The feed element is spatially separated from the first conductive element and the antenna radiator.
    Type: Application
    Filed: January 26, 2021
    Publication date: July 29, 2021
    Applicant: NOKIA SOLUTIONS AND NETWORKS OY
    Inventors: Efstratios DOUMANIS, Murat Emre ERMUTLU
  • Patent number: 11063335
    Abstract: A resonator assembly and method are disclosed.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: July 13, 2021
    Assignee: Nokia Technologies Oy
    Inventors: Efstratios Doumanis, Senad Bulja
  • Patent number: 10978774
    Abstract: A resonator (40) for a filter comprises (i) a cavity (49) having first and second opposing conductive end walls (41, 42) and a conductive side wall (43); (ii) a conductive post (44) extending into the cavity from the first conductive end wall, the end of the conductive post remote from the first conductive end wall being provided or integral with a hollow conductive element (45) which is flared and increases in cross-section in a direction towards the second conductive end wall; and (iii) a load element (47) extending into the cavity from the second conductive end wall, the load element being flared and decreasing in cross-section in a direction away from the second conductive end wall. The end of the load element remote from the second conductive end wall extends into the end of the hollow conductive element remote from the conductive post and forms an annular gap with the hollow conductive element. The resonator has improved power-handling compared to resonators of the prior art.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: April 13, 2021
    Assignee: Nokia Technologies OY
    Inventors: Kimmo Kalervo Karhu, Efstratios Doumanis
  • Patent number: 10756403
    Abstract: A cavity resonator assembly and filters formed from assemblies are provided. The resonator assembly comprising: a first resonator cavity, a first resonant member, and a first signal feed; a second resonator cavity, a second resonant member, and a second signal feed. The first resonant member is-located within the first resonator cavity, arranged to receive a signal from the first signal feed and configured to resonate within the first cavity at a first fundamental frequency. The second resonant member is-located within the second resonator cavity, arranged to receive a signal from the second signal feed and configured to resonate within the second cavity at a second fundamental frequency. At least a portion of the second cavity is housed within the first resonant member. The first resonator cavity surface from which the first resonant member extends is offset from a second resonator cavity surface from which the second resonant member extends.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: August 25, 2020
    Assignee: Alcatel Lucent
    Inventor: Efstratios Doumanis
  • Publication number: 20200176850
    Abstract: A resonator for radio frequency, RF, signals, said resonator comprising a cavity having a longitudinal axis, a first wall, at least one side wall, and a lid arranged opposite the first wall, wherein said resonator further comprises a guiding device which is arranged at said at least one side wall and is configured to guide an axial movement of said lid along said longitudinal axis.
    Type: Application
    Filed: November 26, 2019
    Publication date: June 4, 2020
    Inventors: Efstratios Doumanis, Murat Emre Ermutlu, Juha Olli Jokilahti
  • Publication number: 20200083590
    Abstract: A resonator assembly and method are disclosed.
    Type: Application
    Filed: December 8, 2017
    Publication date: March 12, 2020
    Applicant: Nokia Technologies Oy
    Inventors: Efstratios Doumanis, Senad Bulja
  • Publication number: 20190312329
    Abstract: A resonator (40) for a filter comprises (i) a cavity (49) having first and second opposing conductive end walls (41, 42) and a conductive side wall (43); (ii) a conductive post (44) extending into the cavity from the first conductive end wall, the end of the conductive post remote from the first conductive end wall being provided or integral with a hollow conductive element (45) which is flared and increases in cross-section in a direction towards the second conductive end wall; and (iii) a load element (47) extending into the cavity from the second conductive end wall, the load element being flared and decreasing in cross-section in a direction away from the second conductive end wall. The end of the load element remote from the second conductive end wall extends into the end of the hollow conductive element remote from the conductive post and forms an annular gap with the hollow conductive element. The resonator has improved power-handling compared to resonators of the prior art.
    Type: Application
    Filed: August 24, 2017
    Publication date: October 10, 2019
    Applicant: Nokia Technologies Oy
    Inventors: Kimmo Kalervo Karhu, Efstratios Doumanis
  • Publication number: 20180294541
    Abstract: Aspects and embodiments relate to a cavity resonator assembly and filters formed from such cavity resonator assemblies. One aspect provides a resonator assembly comprising: a first resonator cavity, a first resonant member, and a first signal feed; a second resonator cavity, a second resonant member, and a second signal feed. The first resonant member is located within the first resonator cavity, arranged to receive a signal from the first signal feed and configured to resonate within the first cavity at a first fundamental frequency. The second resonant member is located within the second resonator cavity, arranged to receive a signal from the second signal feed and configured to resonate within the second cavity at a second fundamental frequency. At least a portion of the second cavity is housed within the first resonant member, and the first resonator cavity surface from which the first resonant member extends is offset from a second resonator cavity surface from which the second resonant member extends.
    Type: Application
    Filed: April 8, 2016
    Publication date: October 11, 2018
    Applicant: Alcatel Lucent
    Inventor: Efstratios Doumanis