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 - 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 - 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 - 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 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 - CHAP A1 - Schopp, Christoph A1 - Heuermann, Holger A1 - Marso, Michel T1 - Multiphysical Study of an Atmospheric Microwave Argon Plasma Jet T2 - IEEE Transactions on Plasma Science Y1 - 2017 U6 - http://dx.doi.org/10.1109/TPS.2017.2692735 SN - 1939-9375 VL - 45 IS - 6 SP - 932 EP - 937 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 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 - CHAP A1 - Heuermann, Holger A1 - Finger, Torsten ED - Günther, Michael T1 - Microwave Spark Plug for Very High-Pressure Conditions T2 - Ignition systems for gasoline engines Y1 - 2014 SP - 269 EP - 282 PB - DCM Druck CY - Meckenheim ER - TY - JOUR A1 - Heuermann, Holger T1 - Microwave On-Wafer Measurements with Activ Needle Probe Tips Y1 - 1997 N1 - 47th ARFTG Conference digest : June 20 - 21, 1996, Moscone Convention Center, San Francisco, California / Automatic RF Techniques Group. [Publication chair: Ed Godshalk SP - 208 EP - 214 ER -