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...
Main Authors: | , |
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Format: | Article |
Language: | deu |
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Copernicus Publications
2005-01-01
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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 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="line-height: 20px;"> 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 ISM band) the VSWR is better than 1.22. |
first_indexed | 2024-12-18T06:45:09Z |
format | Article |
id | doaj.art-dc3e8c06ff80418d86ed8179042f4889 |
institution | Directory Open Access Journal |
issn | 1684-9965 1684-9973 |
language | deu |
last_indexed | 2024-12-18T06:45:09Z |
publishDate | 2005-01-01 |
publisher | Copernicus Publications |
record_format | Article |
series | Advances in Radio Science |
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 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="line-height: 20px;"> 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 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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