TY  - JOUR
A1  - Heuermann, Holger
A1  - Emmrich, Thomas
A1  - Bongartz, Simon
T1  - Microwave spark plug to support ignitions with high compression ratios
JF  - IEEE Transactions on Plasma Science
N2  - Upcoming gasoline engines should run with a larger number of fuels beginning from petrol over methanol up to gas by a wide range of compression ratios and a homogeneous charge. In this article, the microwave (MW) spark plug, based on a high-speed frequency hopping system, is introduced as a solution, which can support a nitrogen compression ratio up to 1:39 in a chamber and more. First, an overview of the high-speed frequency hopping MW ignition and operation system as well as the large number of applications are presented. Both gives an understanding of this new base technology for MW plasma generation. Focus of the theoretical part is the explanation of the internal construction of the spark plug, on the achievable of the high voltage generation as well as the high efficiency to hold the plasma. In detail, the development process starting with circuit simulations and ending with the numerical multiphysics field simulations is described. The concept is evaluated with a reference prototype covering the frequency range between 2.40 and 2.48 GHz and working over a large power range from 20 to 200 W. A larger number of different measurements starting by vector hot-S11 measurements and ending by combined working scenarios out of hot temperature, high pressure and charge motion are winding up the article. The limits for the successful pressure tests were given by the pressure chamber. Pressures ranged from 1 to 39 bar and charge motion up to 25 m/s as well as temperatures from 30◦ to 125◦.
KW  - Automotive application
KW  - ignition
KW  - microplasma
KW  - microwave (MW) plasma
KW  - plasma jet
Y1  - 2022
U6  - http://dx.doi.org/10.1109/TPS.2022.3183690
SN  - 1939-9375
IS  - Early Access
SP  - 1
EP  - 6
PB  - IEEE
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Erkens, H.
T1  - Mixed-Mode Chain Scattering Parameters: Theory and Verification
JF  - IEEE Transactions on Microwave Theory and Techniques
N2  - Chain scattering parameters or T-parameters are a useful tool for calculating cascaded two-ports. With the increasing importance of mixed-mode S-parameters, a need for converting the T-parameters from their unbalanced form into a balanced form emerges for suiting both common and differential mode waves, as well as the mode conversion. This paper presents the derivation of the equations for transformations between mixed-mode S- and T-parameters for a mixed-mode two-port. Although derived in a way very similar to monomode T-parameters, no simplifications were necessary. Measurement results exemplify the quality of the T-parameter transformation under real-life conditions.
Y1  - 2007
SN  - 0018-9480
U6  - http://dx.doi.org/10.1109/TMTT.2007.902587
VL  - 55
IS  - 8
SP  - 1704
EP  - 1708
PB  - IEEE
CY  - New York
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
T1  - Multiport S-parameter calculation from two-port network analyzer measurements with or without switch matrix
JF  - ARFTG Conference, 2006 67th, San Francisco, CA
Y1  - 2006
SN  - 978-0-7803-9529-9
SP  - 219
EP  - 222
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Stolle, Reinhard
A1  - Schiek, Burkhard
T1  - Neuartige Algorithmen fuer die Mikrowellen-Entfernungsmessung
JF  - Kleinheubacher Berichte : Vorträge und Berichte der gemeinsamen Tagung des U.R.S.I.-Landesausschusses in der Bundesrepublik Deutschland / Hrsg.: Deutsche Telekom AG. 38. 1995 (1995)
Y1  - 1995
SP  - 817
EP  - 834
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Schiek, Burkhard
T1  - Neue Kalibrierverfahren fuer on-wafer-Messungen
JF  - Kleinheubacher Berichte : Vorträge und Berichte der gemeinsamen Tagung des U.R.S.I.-Landesausschusses in der Bundesrepublik Deutschland / Hrsg.: Deutsche Telekom AG. 37. 1993 (1993)
Y1  - 1993
SP  - 195
EP  - 204
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Stolle, Reinhard
A1  - Schiek, Burkhard
T1  - Novel Algorithms for FMCW Range Finding with Microwaves. Stolle, R.; Heuermann, H.; Schiek, B.
Y1  - 1995
N1  - Conference proceedings / IEEE NTC '95, the Microwave Systems Conference;  NTC <1995, Orlando, Fla.>
SP  - 129
EP  - 132
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Sadeghfam, Arash
T1  - Novel balanced inductor for compact differential systems / Sadeghfam, Arash; Heuermann, Holger
JF  - Conference proceedings : Tuesday 12th, Wednesday 13th and Thursday 14th October, [RAI International Exhibition and Congress Centre, Amsterdam ; part of European Microwave Week 2004] / EuMA, European Microwave Association
Y1  - 2004
SN  - 1-580-53992-0
N1  - European Microwave Conference ; (34, 2004, Amsterdam) ; European Microwave Week ; (7, 2004, Amsterdam)
SP  - 709
EP  - 712
PB  - Horizon House Publ.
CY  - London
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Hillebrand, Jürgen
A1  - Sadeghfam, Arash
T1  - Novel Concept of a Digital SigmaDelta-PLL-Phase-Shift-Modulator / Hillebrand, Jürgen ; Sadeghfam, Arash ; Heuermann, Holger
Y1  - 2008
SN  - 978-3-8007-3086-5
N1  - Microwave Conference (GeMIC), 2008 German
SP  - 123
EP  - 126
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Erkens, H.
T1  - Novel RF switch concepts for differential wireless communications frontends. Erkens, H.; Heuermann, H.
JF  - IEEE Transactions on Microwave Theory and Techniques. 54 (2006), H. 6, Part 1
Y1  - 2006
SN  - 0018-9480
SP  - 2376
EP  - 2382
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Ibrahim, Irfan
T1  - Novel theory and architecture of a vector signal generator implemented with two PLLs / Ibrahim, Irfan ; Heuermann, Holger
JF  - European Conference on Wireless Technology, 2008. EuWiT 2008.
Y1  - 2008
SN  - 978-2-87487-008-8
SP  - 85
EP  - 88
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Thalayasingam, K.
T1  - Novel vector non-linear measurement system for intermodulation measurements  / Thalayasingam, K.; Heuermann, H.
JF  - European Microwave Conference, 2009 : EuMC 2009 ; Sept. 29, 2009 - Oct. 1, 2009, Rome, Italy ; part of European Microwave Week (EuMW) / sponsored by EuMA, European Microwave Association ... Endorsed by IEEE
Y1  - 2009
SN  - 978-1-4244-4748-0
N1  - European Microwave Conference ; (39 : ; 2009.09.29-10.01 : ; Rome)
SP  - 926
EP  - 929
PB  - IEEE
CY  - Piscataway, NJ
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Sadeghfam, Arash
T1  - On the design of multimode integrated circuits in multilayered processes / Sadeghfam, A. ; Heuermann, H.
JF  - European Microwave Conference, 2007, 9-12 Oct. 2007
Y1  - 2007
SN  - 978-2-87487-001-9
N1  - EuMC 2007 ; European Microwave Conference ; (37 : ; 2007.10.09-12 : ; Munich)
SP  - 516
EP  - 519
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
T1  - Praezise Streuparametermessungen sind der Schluessel zur Modellierung elektrischer Schaltungen
JF  - Neues von Rohde & Schwarz (1997)
Y1  - 1997
SP  - 22
EP  - 23
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Schiek, B.
T1  - Procedures for the Determination of the Scattering Parameters for Network Analyzer Calibration
JF  - IEEE transactions on instrumentation and measurement : IM / Institute of Electrical and Electronics Engineers, Instrumentation and Measurement Group. 42 (1993), H. 2
Y1  - 1993
SN  - 0018-9456
SP  - 528
EP  - 531
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Schiek, Burkhard
T1  - Results of Network Analyzer Measurements with Leakage Errors Corrected with the TMS-15-Term Procedure
Y1  - 1994
N1  - 1994 IEEE MTT-S International Microwave Symposium digest : May 23 - 27, 1994, San Diego Convention Center, San Diego, California / H. J. Kuno, ed.
SP  - 1361
EP  - 1364
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Baumann, F.-M.
A1  - Fauth, G.
A1  - Albert, M.
T1  - Results of Network Analyzer Measurements with Leakage Errors Corrected with the TMS-15-Term Procedure
JF  - On-Line Moisture Analysis of Raw Coal
Y1  - 1994
N1  - 1993 International Symposium on On-Line Analysis of Coal : Vienna ; [proceedings].
SP  - 1361
EP  - 1364
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Schiek, B.
T1  - Results of network analyzer measurements with leakage errors-corrected with direct calibration techniques
JF  - IEEE transactions on instrumentation and measurement : IM / Institute of Electrical and Electronics Engineers, Instrumentation and Measurement Group. 46 (1997), H. 5
Y1  - 1997
SN  - 0018-9456
SP  - 1120
EP  - 1127
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Schiek, B.
T1  - Robust Algorithms for Txx Network Analyzer Self-Calibration Procedures
JF  - IEEE transactions on instrumentation and measurement : IM / Institute of Electrical and Electronics Engineers, Instrumentation and Measurement Group. 43 (1994), H. 1
Y1  - 1994
SN  - 0018-9456
SP  - 18
EP  - 23
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Schiek, Burkhard
T1  - Robuster Algorithmus zur Streuparameterbestimmung für systemfehlerkorrigierte Netzwerkanalysatoren
JF  - Kleinheubacher Berichte : Vorträge und Berichte der gemeinsamen Tagung des U.R.S.I.-Landesausschusses in der Bundesrepublik Deutschland / Hrsg.: Deutsche Telekom AG. 35. 1991 (1991)
Y1  - 1991
SP  - 555
EP  - 556
ER  - 
TY  - JOUR
A1  - Heuermann, Holger
A1  - Schiek, Burkhard
T1  - Scattering Parameter Measurements of Microstrip Devices using the Double-LNN Calibration Technique
JF  - Conference proceedings : [Palais des Festivals et des Congrès Cannes, France, 5 - 8 September 1994]
Y1  - 1994
SN  - 0-9518032-5-5
N1  - European Microwave Conference <24, 1994, Cannes>
PB  - Nexus Business Communications
CY  - Swanley
ER  -