Patents by Inventor Rafi Hershtig
Rafi Hershtig 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).
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Patent number: 9660608Abstract: A high power, low passive inter-modulation capacitor is presented, which is formed using metal clad substrates, which are broad-side coupled through a thin air gap. Each substrate may include metal layers affixed on both sides which are electrical coupled together to form a single capacitor plate, or each substrate may have only a single metal layer on the surface adjacent to the air gap. The capacitor has particular application in low cost RF and microwave filters, which may be used in communication equipment and communication test equipment such a diplexers, for low PIM applications.Type: GrantFiled: May 16, 2014Date of Patent: May 23, 2017Assignee: K & L Microwave, Inc.Inventor: Rafi Hershtig
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Patent number: 9136570Abstract: A cavity filter device includes a micro-strip structure comprising a low dielectric organic material forming a printed wiring board. The printed wiring board may be soldered, welded, or adhered to the base of one or more cavity filters. The cavity filter may include a coupling pin such as a RF pin positioned at the base of the filter. The micro-strip structure may be configured to carry a RF signal from the input, across the micro-strip structure to the RF pin positioned at the base of the filter.Type: GrantFiled: December 5, 2008Date of Patent: September 15, 2015Assignee: K & L Microwave, Inc.Inventor: Rafi Hershtig
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Publication number: 20140247535Abstract: A high power, low passive inter-modulation capacitor is presented, which is formed using metal clad substrates, which are broad-side coupled through a thin air gap. Each substrate may include metal layers affixed on both sides which are electrical coupled together to form a single capacitor plate, or each substrate may have only a single metal layer on the surface adjacent to the air gap. The capacitor has particular application in low cost RF and microwave filters, which may be used in communication equipment and communication test equipment such a diplexers, for low PIM applications.Type: ApplicationFiled: May 16, 2014Publication date: September 4, 2014Applicant: K&L Microwave, Inc.Inventor: Rafi Hershtig
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Patent number: 8742869Abstract: A high power, low passive inter-modulation capacitor is presented, which is formed using metal clad substrates, which are broad-side coupled through a thin air gap. Each substrate may include metal layers affixed on both sides which are electrical coupled together to form a single capacitor plate, or each substrate may have only a single metal layer on the surface adjacent to the air gap. The capacitor has particular application in low cost RF and microwave filters, which may be used in communication equipment and communication test equipment such a diplexers, for low PIM applications.Type: GrantFiled: March 16, 2011Date of Patent: June 3, 2014Assignee: K&L Microwave, Inc.Inventor: Rafi Hershtig
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Publication number: 20110234336Abstract: A high power, low passive inter-modulation capacitor is presented, which is formed using metal clad substrates, which are broad-side coupled through a thin air gap. Each substrate may include metal layers affixed on both sides which are electrical coupled together to form a single capacitor plate, or each substrate may have only a single metal layer on the surface adjacent to the air gap. The capacitor has particular application in low cost RF and microwave filters, which may be used in communication equipment and communication test equipment such a diplexers, for low PIM applications.Type: ApplicationFiled: March 16, 2011Publication date: September 29, 2011Applicant: Delaware Capital Formation, Inc.Inventor: Rafi Hershtig
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Publication number: 20090146763Abstract: A cavity filter device includes a micro-strip structure comprising a low dielectric organic material forming a printed wiring board. The printed wiring board may be soldered, welded, or adhered to the base of one or more cavity filters. The cavity filter may include a coupling pin such as a RF pin positioned at the base of the filter. The micro-strip structure may be configured to carry a RF signal from the input, across the micro-strip structure to the RF pin positioned at the base of the filter.Type: ApplicationFiled: December 5, 2008Publication date: June 11, 2009Applicant: K&L Microwave Inc.Inventor: Rafi Hershtig
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Patent number: 6664869Abstract: A delay circuit for the secondary path of a feed-forward high power amplifier is disclosed. A first 3 dB quadrature hybrid coupler is coupled to first and second resonator circuits that are resonant at a first resonant frequency. The output of the first hybrid coupler is coupled to the input of a second 3 dB quadrature hybrid coupler. The second hybrid coupler is coupled to third and fourth resonator circuits that are resonant at a second resonant frequency that is greater than the first resonant frequency. The overall combined delay response of the first hybrid coupler and the second hybrid coupler appearing at the fourth node of the second hybrid coupler is substantially constant between the first resonant frequency and the second resonant frequency.Type: GrantFiled: April 1, 2002Date of Patent: December 16, 2003Assignee: Delaware Capital FormationInventor: Rafi Hershtig
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Publication number: 20030197577Abstract: Aspects of the present invention include a novel delay system, and corresponding method, for increasing the natural delay of a system utilizing filters having only one port. Aspects of the present invention also involve a delay circuit utilizing one or more circulators. Yet further aspects of the invention involve providing a reflective surface for increasing the distance traversed thereby increasing delay. In a further aspect of the invention, multiple filters may be employed by coupling those filters through one or more circulators interchangeably, thereby creating a varying number of delay combinations, and thereby varying the cumulative delay times. In a further aspect of the invention, filter resonators may be arranged in arrays and may be coupled through opening in the cavities encasing the resonators. As an additional aspect of the invention, the resonator cavities of the filter may be cross-coupled.Type: ApplicationFiled: April 22, 2002Publication date: October 23, 2003Applicant: K&L Microwave, Inc.Inventor: Rafi Hershtig
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Patent number: 6600388Abstract: A delay circuit for the secondary path of a feed-forward high power amplifier is disclosed. A first 3 dB quadrature hybrid coupler is coupled to first and second resonator circuits that each includes a varactor circuit and are resonant at a first resonant frequency. The output of the first hybrid coupler is coupled to the input of a second 3 dB quadrature hybrid coupler. The second hybrid coupler is coupled to third and fourth resonator circuits that each includes a varactor circuit and are resonant at a second resonant frequency that is greater than the first resonant frequency. The overall combined delay response of the first hybrid coupler and the second hybrid coupler appearing at the fourth node of the second hybrid coupler is substantially constant between the first resonant frequency and the second resonant frequency.Type: GrantFiled: April 1, 2002Date of Patent: July 29, 2003Assignee: Delaware Capital Formation, Inc.Inventor: Rafi Hershtig
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Publication number: 20020153971Abstract: A delay circuit for the secondary path of a feed-forward high power amplifier is disclosed. A first 3 dB quadrature hybrid coupler is coupled to first and second resonator circuits that are resonant at a first resonant frequency. The output of the first hybrid coupler is coupled to the input of a second 3 dB quadrature hybrid coupler. The second hybrid coupler is coupled to third and fourth resonator circuits that are resonant at a second resonant frequency that is greater than the first resonant frequency. The overall combined delay response of the first hybrid coupler and the second hybrid coupler appearing at the fourth node of the second hybrid coupler is substantially constant between the first resonant frequency and the second resonant frequency.Type: ApplicationFiled: April 1, 2002Publication date: October 24, 2002Applicant: K & L Microwave, Inc.Inventor: Rafi Hershtig
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Publication number: 20020153972Abstract: A delay circuit for the secondary path of a feed-forward high power amplifier is disclosed. A first 3 dB quadrature hybrid coupler is coupled to first and second resonator circuits that each includes a varactor circuit and are resonant at a first resonant frequency. The output of the first hybrid coupler is coupled to the input of a second 3 dB quadrature hybrid coupler. The second hybrid coupler is coupled to third and fourth resonator circuits that each includes a varactor circuit and are resonant at a second resonant frequency that is greater than the first resonant frequency. The overall combined delay response of the first hybrid coupler and the second hybrid coupler appearing at the fourth node of the second hybrid coupler is substantially constant between the first resonant frequency and the second resonant frequency.Type: ApplicationFiled: April 1, 2002Publication date: October 24, 2002Applicant: K & L Microwave, Inc.Inventor: Rafi Hershtig
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Publication number: 20020047756Abstract: A new coaxial multi-coupler that is relatively inexpensive and efficient to manufacture in a low volume and high product mix manufacturing environment. A plurality of coaxial resonators are bonded together to form the multi-coupler. Then, at least one coupling hole is formed for capacitively and/or inductively coupling at least two of the resonators together. Formation of coupling holes upon bonding the resonators together allows for improved manufacturing techniques, convenient fine-tuning of coupling between resonators, and significantly better overall filter/multi-coupler performance as compared with the prior art. One reason for this is that precise alignment of the resonators during bonding is unnecessary according to aspects of the present invention.Type: ApplicationFiled: February 1, 2001Publication date: April 25, 2002Inventors: Rafi Hershtig, Ray Delario, Randy W. Hammer, David L. Spann
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Patent number: 6342825Abstract: A bandpass filter having three waveguide cavities probelessly coupled in a tri-section for producing an asymmetric response about a passband. In another aspect, the bandpass filter also includes first and second waveguide tri-sections coupled in series via a common waveguide cavity, providing a bandpass waveguide filter having transmission zeros on only one side a filter passband.Type: GrantFiled: December 20, 2000Date of Patent: January 29, 2002Assignee: K & L MicrowaveInventor: Rafi Hershtig
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Patent number: 6317013Abstract: A filter, for use with a delay compensating circuit in a delay line filter, formed from co-located capacitors. The capacitors may be formed as traces disposed on a circuit card and co-located to provide capacitive coupling to each other and ground. Proximity coupling wires are connected at one end to capacitive traces, and at the other end hang in mid-air above the next adjacent capacitive trace. The distance between each proximity coupling wire and the neighboring capacitive trace can be varied to control the capacitance coupling between neighboring capacitive traces. The filter is thus tuned by controlling the distances between the proximity coupling wires, and by squeezing or stretching the inductors. The shunt coils control the frequency of the filter, while the series of capacitive traces control the bandwidth.Type: GrantFiled: June 14, 2000Date of Patent: November 13, 2001Assignee: K & L Microwave IncorporatedInventor: Rafi Hershtig
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Patent number: 6236292Abstract: A bandpass filter having three waveguide cavities probelessly coupled in a tri-section for producing an asymmetric response about a passband. In another aspect, the bandpass filter also includes first and second waveguide tri-sections coupled in series via a common waveguide cavity, providing a bandpass waveguide filter having transmission zeroes on only one side a filter passband.Type: GrantFiled: June 30, 1999Date of Patent: May 22, 2001Assignee: Delaware Capital Formation, Inc.Inventor: Rafi Hershtig
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Publication number: 20010000657Abstract: A bandpass filter having three waveguide cavities problessly coupled in a tri-section for producing an asymmetric response about a passband. In another aspect, the bandpass filter also includes first and second waveguide tri-sections coupled in series via a common waveguide cavity, providing a bandpass waveguide filter having transmission zeroes on only one side a filter passband.Type: ApplicationFiled: December 20, 2000Publication date: May 3, 2001Applicant: K&L Microwave, Inc.Inventor: Rafi Hershtig
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Patent number: 6212404Abstract: A cryogenic waveguide cavity filter for use in a wireless communication systems.Type: GrantFiled: July 29, 1998Date of Patent: April 3, 2001Assignee: K&L Microwave Inc.Inventor: Rafi Hershtig
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Patent number: 5936490Abstract: A bandpass filter having three waveguide cavities probelessly coupled in a tri-section for producing an asymmetric response about a passband. In another aspect, the bandpass filter also includes first and second waveguide tri-sections coupled in series via a common waveguide cavity, providing a bandpass waveguide filter having transmission zeroes on only one side a filter passband.Type: GrantFiled: July 29, 1997Date of Patent: August 10, 1999Assignee: K&L Microwave Inc.Inventor: Rafi Hershtig