VNA measurements in the 0.75-1.1 THz band

J. L. Hesler, K. Hui, B. Foley, S. Durant, T. W. Crowe

Research output: Contribution to conferencePaper

Abstract

The design, development and testing of a state-of-the-art 0.75-1.1 THz Vector Network Analyzer Extender will be presented. The extender consists of a series of multipliers and mixers that are used to extend the frequency of Microwave Vector Network Analyzers (with operating frequency typically below 50 GHz). The transmitter consists of a x27 multiplier chain generating an average output power of -24 dBm over the 0.75-1.1 THz band. This power is then fed into a bi-directional coupler that is used to sample the outgoing wave (reference mixer) and the test signal (measurement mixer). The coupler has an insertion loss of ~ 6 dB, yielding a test port power of -30 dBm typical. The receivers have a harmonic factor of 36, and consist of a multiplier chain driving a harmonic mixer. The conversion loss of these mixers is in the range of 20-25 dB. Transceiver measurements of the VNA system yielded a dynamic range of 60-70 dB over 3/4 of the frequency band, with reduced performance at the band edges. The dynamic range measurements were performed with a 10 Hz measurement bandwidth. The VNA Extender was used to perform calibrated measurements of a variety of one-port and two-port test pieces, using a Short-Open-Load-Thru calibration method. The open circuit was implemented using a 1/4-wave delayed short circuit, and the load was a precision load with expected return loss better than 50 dB. Measurements of a 1" straight waveguide piece indicated a return loss of 25-30 dB typical, with the reflections generated by mechanical misalignments at the waveguide interfaces. The measured insertion loss of the 1" straight waveguide piece matched the theoretical loss with a "roughness" factor of 1.4, which is consistent with losses measured at other bands. Additional measurements will be presented at the symposium.

Original languageEnglish (US)
Number of pages1
StatePublished - Jan 1 2011
Event22nd International Symposium on Space Terahertz Technology 2011, ISSTT 2011 - Tucson, AZ, United States
Duration: Apr 25 2011Apr 28 2011

Conference

Conference22nd International Symposium on Space Terahertz Technology 2011, ISSTT 2011
CountryUnited States
CityTucson, AZ
Period4/25/114/28/11

Fingerprint

multipliers
waveguides
insertion loss
dynamic range
Waveguides
analyzers
Electric network analyzers
Insertion losses
harmonics
signal measurement
directional couplers
short circuits
rangefinding
transmitter receivers
misalignment
transmitters
couplers
Directional couplers
roughness
receivers

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Space and Planetary Science
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Radiation

Cite this

Hesler, J. L., Hui, K., Foley, B., Durant, S., & Crowe, T. W. (2011). VNA measurements in the 0.75-1.1 THz band. Paper presented at 22nd International Symposium on Space Terahertz Technology 2011, ISSTT 2011, Tucson, AZ, United States.
Hesler, J. L. ; Hui, K. ; Foley, B. ; Durant, S. ; Crowe, T. W. / VNA measurements in the 0.75-1.1 THz band. Paper presented at 22nd International Symposium on Space Terahertz Technology 2011, ISSTT 2011, Tucson, AZ, United States.1 p.
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Hesler, JL, Hui, K, Foley, B, Durant, S & Crowe, TW 2011, 'VNA measurements in the 0.75-1.1 THz band', Paper presented at 22nd International Symposium on Space Terahertz Technology 2011, ISSTT 2011, Tucson, AZ, United States, 4/25/11 - 4/28/11.

VNA measurements in the 0.75-1.1 THz band. / Hesler, J. L.; Hui, K.; Foley, B.; Durant, S.; Crowe, T. W.

2011. Paper presented at 22nd International Symposium on Space Terahertz Technology 2011, ISSTT 2011, Tucson, AZ, United States.

Research output: Contribution to conferencePaper

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AU - Hesler, J. L.

AU - Hui, K.

AU - Foley, B.

AU - Durant, S.

AU - Crowe, T. W.

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N2 - The design, development and testing of a state-of-the-art 0.75-1.1 THz Vector Network Analyzer Extender will be presented. The extender consists of a series of multipliers and mixers that are used to extend the frequency of Microwave Vector Network Analyzers (with operating frequency typically below 50 GHz). The transmitter consists of a x27 multiplier chain generating an average output power of -24 dBm over the 0.75-1.1 THz band. This power is then fed into a bi-directional coupler that is used to sample the outgoing wave (reference mixer) and the test signal (measurement mixer). The coupler has an insertion loss of ~ 6 dB, yielding a test port power of -30 dBm typical. The receivers have a harmonic factor of 36, and consist of a multiplier chain driving a harmonic mixer. The conversion loss of these mixers is in the range of 20-25 dB. Transceiver measurements of the VNA system yielded a dynamic range of 60-70 dB over 3/4 of the frequency band, with reduced performance at the band edges. The dynamic range measurements were performed with a 10 Hz measurement bandwidth. The VNA Extender was used to perform calibrated measurements of a variety of one-port and two-port test pieces, using a Short-Open-Load-Thru calibration method. The open circuit was implemented using a 1/4-wave delayed short circuit, and the load was a precision load with expected return loss better than 50 dB. Measurements of a 1" straight waveguide piece indicated a return loss of 25-30 dB typical, with the reflections generated by mechanical misalignments at the waveguide interfaces. The measured insertion loss of the 1" straight waveguide piece matched the theoretical loss with a "roughness" factor of 1.4, which is consistent with losses measured at other bands. Additional measurements will be presented at the symposium.

AB - The design, development and testing of a state-of-the-art 0.75-1.1 THz Vector Network Analyzer Extender will be presented. The extender consists of a series of multipliers and mixers that are used to extend the frequency of Microwave Vector Network Analyzers (with operating frequency typically below 50 GHz). The transmitter consists of a x27 multiplier chain generating an average output power of -24 dBm over the 0.75-1.1 THz band. This power is then fed into a bi-directional coupler that is used to sample the outgoing wave (reference mixer) and the test signal (measurement mixer). The coupler has an insertion loss of ~ 6 dB, yielding a test port power of -30 dBm typical. The receivers have a harmonic factor of 36, and consist of a multiplier chain driving a harmonic mixer. The conversion loss of these mixers is in the range of 20-25 dB. Transceiver measurements of the VNA system yielded a dynamic range of 60-70 dB over 3/4 of the frequency band, with reduced performance at the band edges. The dynamic range measurements were performed with a 10 Hz measurement bandwidth. The VNA Extender was used to perform calibrated measurements of a variety of one-port and two-port test pieces, using a Short-Open-Load-Thru calibration method. The open circuit was implemented using a 1/4-wave delayed short circuit, and the load was a precision load with expected return loss better than 50 dB. Measurements of a 1" straight waveguide piece indicated a return loss of 25-30 dB typical, with the reflections generated by mechanical misalignments at the waveguide interfaces. The measured insertion loss of the 1" straight waveguide piece matched the theoretical loss with a "roughness" factor of 1.4, which is consistent with losses measured at other bands. Additional measurements will be presented at the symposium.

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Hesler JL, Hui K, Foley B, Durant S, Crowe TW. VNA measurements in the 0.75-1.1 THz band. 2011. Paper presented at 22nd International Symposium on Space Terahertz Technology 2011, ISSTT 2011, Tucson, AZ, United States.