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Low cost transmission line demonstrator for a novel intermediate level communication engineering laboratory

Torres Torres, Francisco,Corbella Sanahuja, Ignasi,Cardama Aznar, Ángel,Romeu Robert, Jordi,Galindez, Oscar · 1998

Abstract

This paper is devoted to the description of a transmission line laboratory demonstrator for intermediate level communication engineering students, within a course on radiation and guided waves. Student activities have been organized according to the needs of intermediate level students and the objectives of an introductory laboratory, which are substantially different from those of specialized laboratory activities aimed at higher level students and placed just before graduation. Since a large number of students attend these laboratory sessions before they choose their specialty, low cost is an unavoidable requirement to be considered. For this reason, the measurement set-up makes use of standard instrumentation, usually available in a basic electronic laboratory, which allows multiplication of work places at a reasonable cost. Both time domain reflectometry and sinusoidal steady state measurements are presented to characterize the main parameters of a coaxial line. However, discussions are mainly focused on sinusoidal measurements, which are scarce in the literature and exclusively devoted to slotted line measurements. The experimental work undertaken by the students gives them insight into main transmission line parameter and features: line impedance, propagation speed, its behavior as an impedance transformer, the complex nature of the measured magnitudes and the standing wave behavior of voltage and attenuation.

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Low cost transmission line demonstrator for a novel intermediate level communication engineering laboratory

Author: Torres Torres, Francisco,Corbella Sanahuja, Ignasi,Cardama Aznar, Ángel,Romeu Robert, Jordi,Galindez, Oscar
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Year: 1998
Source: https://upcommons.upc.edu/bitstream/2117/1527/4/low%20cost%20transmission00787375.pdf
IEEE TRANSACTIONS ON EDUCATION, VOL. 41, NO. 4, NOVEMBER 1998 349
Low-Cos T ansmission Line Demons a o o a No el
In e media e-Le el Communica ion Enginee ing Labo a o y
F ancesc To es, Ignasi Co bella, Angel Ca dama, Jo di Romeu, Osca Galindez
Index Te ms—Educa ion, impedance, labo a o y, mic owa es, p opaga ion, ansmission lines.
I. SUMMARY
This pape desc ibes a ansmission line labo a o y o in e media e-le el communica ion enginee ing
s uden s, wi hin a cou se on Radia ion and Guided Wa es. The measu emen se up uses low-cos s anda d
ins umen a ion, a ailable in any basic elec onic labo a o y. Bo h ime domain e lec ome y and sinusoidal
s eady-s a e measu emen s a e used o cha ac e ize a coaxial line. Howe e , discussions a e mainly ocused
on sinusoidal measu emen s. The expe imen al wo k unde aken by he s uden s gi es hem insigh in o
main ansmission line pa ame e s and ea u es: cha ac e is ic impedance, p opaga ion speed, beha io as
an impedance ans o me , he complex na u e o he measu ed magni udes, he s anding wa e beha io
o ol age, and a enua ion.
F ancesc To es was bo n in Ibiza, Spain, in 1962. He ecei ed he Ingenie o and Doc o Ingenie o deg ees in Telecommunica ion
Enginee ing, bo h om he Poly echnic Uni e si y o Ca alonia (UPC), Ba celona, Spain, in 1988 and 1992, espec i ely.
F om 1988 o 1989 he was Resea ch Assis an in he RF Sys em Di ision a he Eu opean Space Agency, Holland, de o ed
o mic owa e de ice es ing and cha ac e iza ion. In 1989 he joined he An enna-Mic owa e-Rada g oup o he UPC, whe e he
cu en ly holds a pos as P o esso . His main esea ch in e es s include he design and es o mic owa e sys ems and subsys ems.
He is cu en ly engaged in esea ch on in e e ome ic adiome e s de o ed o Ea h obse a ion.
Ignasi Co bella was bo n in Ba celona, Spain, in 1955. He ecei ed he Ingenie o and Doc o Ingenie o deg ees in Telecommunica ion
Enginee ing, bo h om he Poly echnic Uni e si y o Ca alonia (UPC), Ba celona, in 1977 and 1983, espec i ely.
In 1976 he joined he School o Telecommunica ion Enginee ing in Ba celona as a Resea ch Assis an in he Mic owa e Labo a o y
whe e he wo ked on passi e mic owa e in eg a ed ci cui design and cha ac e iza ion. He became Assis an P o esso in 1982,
Associa e P o esso in 1986, and P o esso in 1993. He is cu en ly eaching a mic owa e cou se and is engaged in esea ch in
mic owa e in e e ome e adiome y and mic owa e sys em design in he Depa men o Signal Theo y and Communica ions o
UPC.
Angel Ca dama was bo n in San iago, Spain, on May 13, 1944. He ecei ed he Ingenie o de Telecomunicacion deg ee om he
Poly echnic Uni e si y o Mad id, Mad id, Spain, in 1968, and he Sc.M. and Ph.D. deg ees in elec ical enginee ing om B own
Uni e si y, P o idence, RI, in 1970 and 1973, espec i ely.
In 1972 he joined he acul y o he E.T.S.I. de elecomunicacion a he Poly echnic Uni e si y o Ca alonia, Ba celona, Spain,
whe e he holds he posi ion o P o esso . His esea ch in e es s include p opaga ion in op ical ibe s, high- equency ape u e and
a ay an ennas, and nea - ield an enna scanning sys ems o he design o mic owa e imaging sys ems and ada an ennas.
Jo di Romeu was bo n in Ba celona, Spain, in 1962. He ecei ed he Ingenie o and Doc o Ingenie o deg ees in Telecommunica ion
Enginee ing, bo h om he Poly echnic Uni e si y o Ca alonia (UPC), Ba celona, Spain in 1986 and 1991, espec i ely.
In 1985 he joined he Elec omage ic and Pho onic Enginee ing G oup o he Signal Theo y and Communica ions Depa men
he e. Cu en ly he is Associa e P o esso a UPC, whe e he is engaged in esea ch in an enna nea ield measu emen s, an enna
diagnos ics, and an enna design.
Osca Galindez was bo n in Ba celona, Spain, in Ma ch 1973. He is p esen ly wo king owa d he Communica ion Enginee ing
deg ee a he School o Telecommunica ion Enginee ing o Ba celona, Ca alonia, Spain.
Manusc ip ecei ed May 12, 1997; e ised July 30, 1998. CD-ROM olde 09.
The au ho s a e wi h he Depa men o Signal Theo y and Communica ions, Uni e si a Poli cnica de Ca alunya, 08034
Ba celona, Spain.
Publishe I em Iden i ie S 0018-9359(98)09459-X.
0162–8828/98$10.00 1998 IEEE