A Low-Cost Versatile Broadband (DC to K-Band) Planar 50Ω Termination

Numerous standard RF circuits like directional couplers, hybrids, amplitude modulators, oscillators, etc. require a 50Ω termination. Additionally, in several measurement scenarios, ports have to be terminated. Such terminations are preferable of the same waveguide type as the circuits to avoid degra...

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Main Authors: M. O. Olbrich, E. M. Biebl
Format: Article
Language:deu
Published: Copernicus Publications 2005-01-01
Series:Advances in Radio Science
Online Access:http://www.adv-radio-sci.net/3/147/2005/ars-3-147-2005.pdf
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author M. O. Olbrich
E. M. Biebl
author_facet M. O. Olbrich
E. M. Biebl
author_sort M. O. Olbrich
collection DOAJ
description Numerous standard RF circuits like directional couplers, hybrids, amplitude modulators, oscillators, etc. require a 50Ω termination. Additionally, in several measurement scenarios, ports have to be terminated. Such terminations are preferable of the same waveguide type as the circuits to avoid degradation of their performance. In general, standard fabrication steps are desired as they are cost-effective. The straightforward solution is a 50Ω resistor shunted to ground by means of a via. Partial wraparound SMD resistors in a 0402&nbsp;size have low parasitics making them applicable up to K-band. However, for RF, this combination suffers from the considerable inductive parasitics of the via. Different approaches to avoid the vias, with varying disadvantages exist. We analyzed the approach of broadband matching the non ideal viaresistor combination to 50Ω by means of a filter structure. The realization uses only standard design and fabrication methods. The design procedure can easily be adapted to arbitrary substrates and fabrication technologies. </p><p style=&quot;line-height: 20px;&quot;> The assembled 50Ω termination was measured using TRL calibration with a VNA. Therefore its characteristics are determined in the intended plane and it can be directly included into a planar 50Ω circuit. The measured terminations showed a VSWR better than 1.34 within the whole band from DC to K-band, and within 57% of the band (including the 24GHz&nbsp;ISM band) the VSWR is better than 1.22.
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spelling doaj.art-dc3e8c06ff80418d86ed8179042f48892022-12-21T21:17:31ZdeuCopernicus PublicationsAdvances in Radio Science1684-99651684-99732005-01-013147150A Low-Cost Versatile Broadband (DC to K-Band) Planar 50Ω TerminationM. O. OlbrichE. M. BieblNumerous standard RF circuits like directional couplers, hybrids, amplitude modulators, oscillators, etc. require a 50Ω termination. Additionally, in several measurement scenarios, ports have to be terminated. Such terminations are preferable of the same waveguide type as the circuits to avoid degradation of their performance. In general, standard fabrication steps are desired as they are cost-effective. The straightforward solution is a 50Ω resistor shunted to ground by means of a via. Partial wraparound SMD resistors in a 0402&nbsp;size have low parasitics making them applicable up to K-band. However, for RF, this combination suffers from the considerable inductive parasitics of the via. Different approaches to avoid the vias, with varying disadvantages exist. We analyzed the approach of broadband matching the non ideal viaresistor combination to 50Ω by means of a filter structure. The realization uses only standard design and fabrication methods. The design procedure can easily be adapted to arbitrary substrates and fabrication technologies. </p><p style=&quot;line-height: 20px;&quot;> The assembled 50Ω termination was measured using TRL calibration with a VNA. Therefore its characteristics are determined in the intended plane and it can be directly included into a planar 50Ω circuit. The measured terminations showed a VSWR better than 1.34 within the whole band from DC to K-band, and within 57% of the band (including the 24GHz&nbsp;ISM band) the VSWR is better than 1.22.http://www.adv-radio-sci.net/3/147/2005/ars-3-147-2005.pdf
spellingShingle M. O. Olbrich
E. M. Biebl
A Low-Cost Versatile Broadband (DC to K-Band) Planar 50Ω Termination
Advances in Radio Science
title A Low-Cost Versatile Broadband (DC to K-Band) Planar 50Ω Termination
title_full A Low-Cost Versatile Broadband (DC to K-Band) Planar 50Ω Termination
title_fullStr A Low-Cost Versatile Broadband (DC to K-Band) Planar 50Ω Termination
title_full_unstemmed A Low-Cost Versatile Broadband (DC to K-Band) Planar 50Ω Termination
title_short A Low-Cost Versatile Broadband (DC to K-Band) Planar 50Ω Termination
title_sort low cost versatile broadband dc to k band planar 50ω termination
url http://www.adv-radio-sci.net/3/147/2005/ars-3-147-2005.pdf
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