George Ponchak - Academia.edu (original) (raw)

Papers by George Ponchak

Research paper thumbnail of High frequency interconnects on silicon substrates

1997 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Technical Papers, 1997

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Research paper thumbnail of A stitching technique for expanding large 3-D multi-layer antenna arrays in Ku-band using small array units

2008 58th Electronic Components and Technology Conference, 2008

This paper presents an approach, where via technology is used to expand an antenna array by &quot... more This paper presents an approach, where via technology is used to expand an antenna array by "stitching" two unit arrays. This method becomes useful as the processing capability becomes limited by the size of the antenna array. Using the bonding process of liquid crystal polymer (LCP), a 3D multi-layer 4times8 patch antenna array has been created and measured at 14

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Research paper thumbnail of PVD silicon carbide as a thin film packaging technology for antennas on LCP substrates for harsh environments

2010 IEEE Radio and Wireless Symposium (RWS), 2010

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Research paper thumbnail of Characteristics of a Linearly Tapered Slot Antenna (LTSA) conformed longitudinally around a cylinder

2007 IEEE Antennas and Propagation International Symposium, 2007

The family of tapered slot antennas (TSA's) is suitable for numerous applications. Their eas... more The family of tapered slot antennas (TSA's) is suitable for numerous applications. Their ease of fabrication, wide bandwidth, and high gain make them desirable for military and commercial systems. Fabrication on thin, flexible substrates allows the TSA to be conformed over a given body, such as an aircraft wing or a piece of clothing for wearable networks. Previously, a double exponentially tapered slot antenna (DETSA) was conformed around an exponential curvature, which showed that the main beam skewed towards the direction of curvature. This paper presents a linearly tapered slot antenna (LTSA) conformed longitudinally around a cylinder. Measured and simulated radiation patterns and the direction of maximum H co-polarization (Hco) as a function of the cylinder radius are presented.

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Research paper thumbnail of Compact cactus-shaped Ultra Wide-Band (UWB) monopole on organic substrate

2007 IEEE Antennas and Propagation International Symposium, 2007

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Research paper thumbnail of X-band and K-band lumped Wilkinson power dividers with a micromachined technology

2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017), 2000

Abstrucr-. With a novel micromachined technology, Wilkinson power dividers have been realized by ... more Abstrucr-. With a novel micromachined technology, Wilkinson power dividers have been realized by lumped components such as spiral inductors, metal-insulator-metal (MIM) capacitors and thin-film-resistors (TFRs). For the first time, X-band and K-band power dividers with low ...

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Research paper thumbnail of High temperature characterization of alumina substrates and folded slot antenna

2007 IEEE Antennas and Propagation International Symposium, 2007

Page 1. High Temperature Characterization of Alumina Substrates and Folded Slot Antenna Maximilia... more Page 1. High Temperature Characterization of Alumina Substrates and Folded Slot Antenna Maximilian C. Scardelletti, Jennifer L. Jordan*, Amy R. Stalker, and George E. Ponchak NASA Glenn Research Center, Cleveland, Ohio, 44135 Maximilian.C.Scardelletti@nasa.gov ...

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Research paper thumbnail of Characteristics of coplanar waveguide on sapphire for high temperature applications (25 to 400° C)

2007 European Microwave Conference, 2007

Page 1. Characteristics of Coplanar Waveguide on Sapphire for High Temperature Applications (25 t... more Page 1. Characteristics of Coplanar Waveguide on Sapphire for High Temperature Applications (25 to 400˚ C) George E. Ponchak, Jennifer L. Jordan, Maximilian Scardelletti, and Amy R. Stalker NASA Glenn Research Center ...

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Research paper thumbnail of A monolithic W-band three-stage LNA using 0.1 mu m InAlAs/InGaAs/InP HEMT technology

A monolithic W-band three-stage low-noise amplifier (LNA) based on 0.1- mu m pseudomorphic (PM) I... more A monolithic W-band three-stage low-noise amplifier (LNA) based on 0.1- mu m pseudomorphic (PM) InAlAs/InGaAs/InP high-electron-mobility transistors (HEMTs) has been developed. This LNA has demonstrated a noise figure of 4.3 dB and an associated small-signal gain of 19 dB at 100 GHz with a low DC power consumption of 20 mW. This demonstrates the potential of InP HEMT technology for

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Research paper thumbnail of Evanescent microwave probes on high-resistivity silicon and its application in characterization of semiconductors

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Research paper thumbnail of SiGe power heterojunction bipolar transistors (HBTs) fabricated by fully self-aligned double mesa technology

2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157), 2001

I. INTRODUCTION Recent advances in the growth of epitaxial SiGe layers have led to high quality S... more I. INTRODUCTION Recent advances in the growth of epitaxial SiGe layers have led to high quality SiGe heterojunctions and consequently high performance SiGe heterojunction bipolar transistors (HBT's)[ 11-[3]. With the mature Si process technology, the Si-based microwave ...

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Research paper thumbnail of Integration of a 4×8 antenna array with a reconfigurable 2-bit phase shifter using RF MEMS switches on multilayer organic substrates

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Research paper thumbnail of Design and implementation of micromachined lumped quadrature (90°) hybrids

Microwave, MTT-S International Symposium, 2001

To reduce the chip size of a quadrature hybrid at frequencies below K-band, lumped components hav... more To reduce the chip size of a quadrature hybrid at frequencies below K-band, lumped components have been employed to replace the transmission line segments. Systematic analysis and design technique has been developed. For the first time, X-band lumped quadrature hybrids with low insertion loss and wide bandwidth have been fabricated using a micromachined process technology. Approximately, two order of magnitude

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Research paper thumbnail of Ku-band (12.6 GHz) SiGe/Si high-power heterojunction bipolar transistors

Electronics Letters, 2001

ABSTRACT

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Research paper thumbnail of Double exponentially tapered slot antenna (DETSA) on liquid crystal polymer (LCP) for UWB applications

2005 IEEE Antennas and Propagation Society International Symposium, 2005

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Research paper thumbnail of Novel physical sensors using evanescent microwave probes

Review of Scientific Instruments, 1999

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Research paper thumbnail of Design of layered ridge dielectric waveguide for millimeter and sub-millimeter wave circuits

International Journal of Infrared and Millimeter Waves, 1997

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Research paper thumbnail of Miniaturized Wilkinson power dividers utilizing capacitive loading

IEEE Transactions on Neural Networks, 2002

The authors report the miniaturization of a planar Wilkinson power divider by capacitive loading ... more The authors report the miniaturization of a planar Wilkinson power divider by capacitive loading of the quarter wave transmission lines employed in conventional Wilkinson power dividers. Reduction of the transmission line segments from λ/4 to between λ/5 and λ/12 are reported here. The input and output lines at the three ports and the lines comprising the divider itself are coplanar

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Research paper thumbnail of A high-power and high-gain X-band Si/SiGe/Si heterojunction bipolar transistor

IEEE Transactions on Microwave Theory and Techniques, 2002

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Research paper thumbnail of Characterization of asymmetric coplanar waveguide discontinuities

IEEE Transactions on Microwave Theory and Techniques, 1993

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Research paper thumbnail of High frequency interconnects on silicon substrates

1997 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Technical Papers, 1997

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A stitching technique for expanding large 3-D multi-layer antenna arrays in Ku-band using small array units

2008 58th Electronic Components and Technology Conference, 2008

This paper presents an approach, where via technology is used to expand an antenna array by &quot... more This paper presents an approach, where via technology is used to expand an antenna array by "stitching" two unit arrays. This method becomes useful as the processing capability becomes limited by the size of the antenna array. Using the bonding process of liquid crystal polymer (LCP), a 3D multi-layer 4times8 patch antenna array has been created and measured at 14

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Research paper thumbnail of PVD silicon carbide as a thin film packaging technology for antennas on LCP substrates for harsh environments

2010 IEEE Radio and Wireless Symposium (RWS), 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Characteristics of a Linearly Tapered Slot Antenna (LTSA) conformed longitudinally around a cylinder

2007 IEEE Antennas and Propagation International Symposium, 2007

The family of tapered slot antennas (TSA's) is suitable for numerous applications. Their eas... more The family of tapered slot antennas (TSA's) is suitable for numerous applications. Their ease of fabrication, wide bandwidth, and high gain make them desirable for military and commercial systems. Fabrication on thin, flexible substrates allows the TSA to be conformed over a given body, such as an aircraft wing or a piece of clothing for wearable networks. Previously, a double exponentially tapered slot antenna (DETSA) was conformed around an exponential curvature, which showed that the main beam skewed towards the direction of curvature. This paper presents a linearly tapered slot antenna (LTSA) conformed longitudinally around a cylinder. Measured and simulated radiation patterns and the direction of maximum H co-polarization (Hco) as a function of the cylinder radius are presented.

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Research paper thumbnail of Compact cactus-shaped Ultra Wide-Band (UWB) monopole on organic substrate

2007 IEEE Antennas and Propagation International Symposium, 2007

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Research paper thumbnail of X-band and K-band lumped Wilkinson power dividers with a micromachined technology

2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017), 2000

Abstrucr-. With a novel micromachined technology, Wilkinson power dividers have been realized by ... more Abstrucr-. With a novel micromachined technology, Wilkinson power dividers have been realized by lumped components such as spiral inductors, metal-insulator-metal (MIM) capacitors and thin-film-resistors (TFRs). For the first time, X-band and K-band power dividers with low ...

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Research paper thumbnail of High temperature characterization of alumina substrates and folded slot antenna

2007 IEEE Antennas and Propagation International Symposium, 2007

Page 1. High Temperature Characterization of Alumina Substrates and Folded Slot Antenna Maximilia... more Page 1. High Temperature Characterization of Alumina Substrates and Folded Slot Antenna Maximilian C. Scardelletti, Jennifer L. Jordan*, Amy R. Stalker, and George E. Ponchak NASA Glenn Research Center, Cleveland, Ohio, 44135 Maximilian.C.Scardelletti@nasa.gov ...

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Research paper thumbnail of Characteristics of coplanar waveguide on sapphire for high temperature applications (25 to 400° C)

2007 European Microwave Conference, 2007

Page 1. Characteristics of Coplanar Waveguide on Sapphire for High Temperature Applications (25 t... more Page 1. Characteristics of Coplanar Waveguide on Sapphire for High Temperature Applications (25 to 400˚ C) George E. Ponchak, Jennifer L. Jordan, Maximilian Scardelletti, and Amy R. Stalker NASA Glenn Research Center ...

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Research paper thumbnail of A monolithic W-band three-stage LNA using 0.1 mu m InAlAs/InGaAs/InP HEMT technology

A monolithic W-band three-stage low-noise amplifier (LNA) based on 0.1- mu m pseudomorphic (PM) I... more A monolithic W-band three-stage low-noise amplifier (LNA) based on 0.1- mu m pseudomorphic (PM) InAlAs/InGaAs/InP high-electron-mobility transistors (HEMTs) has been developed. This LNA has demonstrated a noise figure of 4.3 dB and an associated small-signal gain of 19 dB at 100 GHz with a low DC power consumption of 20 mW. This demonstrates the potential of InP HEMT technology for

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Evanescent microwave probes on high-resistivity silicon and its application in characterization of semiconductors

Bookmarks Related papers MentionsView impact

Research paper thumbnail of SiGe power heterojunction bipolar transistors (HBTs) fabricated by fully self-aligned double mesa technology

2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157), 2001

I. INTRODUCTION Recent advances in the growth of epitaxial SiGe layers have led to high quality S... more I. INTRODUCTION Recent advances in the growth of epitaxial SiGe layers have led to high quality SiGe heterojunctions and consequently high performance SiGe heterojunction bipolar transistors (HBT's)[ 11-[3]. With the mature Si process technology, the Si-based microwave ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Integration of a 4×8 antenna array with a reconfigurable 2-bit phase shifter using RF MEMS switches on multilayer organic substrates

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design and implementation of micromachined lumped quadrature (90°) hybrids

Microwave, MTT-S International Symposium, 2001

To reduce the chip size of a quadrature hybrid at frequencies below K-band, lumped components hav... more To reduce the chip size of a quadrature hybrid at frequencies below K-band, lumped components have been employed to replace the transmission line segments. Systematic analysis and design technique has been developed. For the first time, X-band lumped quadrature hybrids with low insertion loss and wide bandwidth have been fabricated using a micromachined process technology. Approximately, two order of magnitude

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ku-band (12.6 GHz) SiGe/Si high-power heterojunction bipolar transistors

Electronics Letters, 2001

ABSTRACT

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Research paper thumbnail of Double exponentially tapered slot antenna (DETSA) on liquid crystal polymer (LCP) for UWB applications

2005 IEEE Antennas and Propagation Society International Symposium, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Novel physical sensors using evanescent microwave probes

Review of Scientific Instruments, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design of layered ridge dielectric waveguide for millimeter and sub-millimeter wave circuits

International Journal of Infrared and Millimeter Waves, 1997

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Miniaturized Wilkinson power dividers utilizing capacitive loading

IEEE Transactions on Neural Networks, 2002

The authors report the miniaturization of a planar Wilkinson power divider by capacitive loading ... more The authors report the miniaturization of a planar Wilkinson power divider by capacitive loading of the quarter wave transmission lines employed in conventional Wilkinson power dividers. Reduction of the transmission line segments from λ/4 to between λ/5 and λ/12 are reported here. The input and output lines at the three ports and the lines comprising the divider itself are coplanar

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A high-power and high-gain X-band Si/SiGe/Si heterojunction bipolar transistor

IEEE Transactions on Microwave Theory and Techniques, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Characterization of asymmetric coplanar waveguide discontinuities

IEEE Transactions on Microwave Theory and Techniques, 1993

Bookmarks Related papers MentionsView impact