@article{capek_schab_2023, title={2023 Edward E. Altschuler AP-S Magazine Prize Paper Award}, volume={71}, ISSN={["1558-2221"]}, DOI={10.1109/TAP.2023.3337597}, number={12}, journal={IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION}, author={Capek, Miloslav and Schab, Kurt}, year={2023}, month={Dec}, pages={9171–9171} }
 @article{devi_pejman_phillips_zhang_soghrati_nakshatrala_najafi_schab_patrick_2021, title={A Microvascular-Based Multifunctional and Reconfigurable Metamaterial}, ISSN={["2365-709X"]}, DOI={10.1002/admt.202100433}, abstractNote={Abstract}, journal={ADVANCED MATERIALS TECHNOLOGIES}, author={Devi, Urmi and Pejman, Reza and Phillips, Zachary J. and Zhang, Pengfei and Soghrati, Soheil and Nakshatrala, Kalyana B. and Najafi, Ahmad R. and Schab, Kurt R. and Patrick, Jason F.}, year={2021}, month={Aug} }
 @article{huang_schab_dusenbury_sluss_adams_2021, title={DC-Assisted Stabilization of Internal Oscillations for Improved Symbol Transitions in a Direct Antenna Modulation Transmitter}, volume={8}, ISSN={["1557-9670"]}, DOI={10.1109/TMTT.2021.3103209}, abstractNote={Internal oscillations in switched antenna transmitters cause undesirable fluctuations of the stored energy in the system, reducing the effectiveness of time-varying broadbanding methods, such as energy-synchronous direct antenna modulation. To mitigate these parasitic oscillations, a modified direct antenna modulation system with an auxiliary DC source is introduced to stabilize energy storage on the antenna. A detailed circuit model for a direct antenna modulation system is used to identify the origin of the oscillations and to justify the selection of the DC source. Measured phase shift keyed waveforms transmitted using the modified system show significant increases in signal fidelity, including a 10–20-dB reduction in error vector magnitude compared to a time-invariant system. Comparison to an equivalent, scalable time-invariant antenna suggests that the switched transmitter behaves as though it has 2–3 times lower radiation Q-factor and 20% higher radiation efficiency.}, journal={IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES}, author={Huang, Danyang and Schab, Kurt and Dusenbury, Joseph K. and Sluss, Brandon and Adams, Jacob J.}, year={2021}, month={Aug} }
 @article{schab_huang_adams_2020, title={An Energy-Synchronous Direct Antenna Modulation Method for Phase Shift Keying}, volume={1}, ISSN={["2637-6431"]}, DOI={10.1109/OJAP.2020.2972842}, abstractNote={A novel scheme for transmitting broadband phase shift keyed signals from electrically small antennas using energy-synchronous direct antenna modulation is described. We outline fundamental operating principles of the method and experimentally compare its performance to that of a conventional band-limited transmit antenna with the same electrical size and radiation efficiency. Transmitted waveforms are analyzed in the time domain both at RF and baseband. Results show significant increases in signal quality, suggesting a larger effective transmit bandwidth and greater potential throughput when the proposed direct antenna modulation scheme is used.}, journal={IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION}, author={Schab, Kurt and Huang, Danyang and Adams, Jacob J.}, year={2020}, pages={41–46} }
 @article{huang_adams_schab_2020, title={Investigation of Ringing Effects on Phase Shift Keyed Direct Antenna Modulation Transmitters}, ISSN={["1522-3965"]}, DOI={10.1109/IEEECONF35879.2020.9330246}, abstractNote={In this paper, a method of direct antenna modulation (DAM) transmitting phase shift keyed (PSK) high data rate signals using a narrowband antenna is described. We analyze the result of an over the air DAM PSK measurement and degradation are observed in QPSK DAM compared to the ideal case. We demonstrate that it is the parasitics of the circuit that reduce the ability of the system to store voltage and achieve fast transitions, particularly between certain combinations of symbols. This degradation is studied and it can be predicted by circuit model simulation.}, journal={2020 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION AND NORTH AMERICAN RADIO SCIENCE MEETING}, author={Huang, Danyang and Adams, Jacob J. and Schab, Kurt}, year={2020}, pages={1817–1818} }
 @article{schab_jelinek_capek_ehrenborg_tayli_vandenbosch_gustafsson_2018, title={Energy Stored by Radiating Systems}, volume={6}, ISSN={["2169-3536"]}, DOI={10.1109/access.2018.2807922}, abstractNote={Though commonly used to calculate Q-factor and fractional bandwidth, the energy stored by radiating systems (antennas) is a subtle and challenging concept that has perplexed researchers for over half a century. Here, the obstacles in defining and calculating stored energy in general electromagnetic systems are presented from first principles as well as using demonstrative examples from electrostatics, circuits, and radiating systems. Along the way, the concept of unobservable energy is introduced to formalize such challenges. Existing methods of defining stored energy in radiating systems are then reviewed in a framework based on technical commonalities rather than chronological order. Equivalences between some methods under common assumptions are highlighted, along with the strengths, weaknesses, and unique applications of certain techniques. Numerical examples are provided to compare the relative margin between methods on several radiating structures.}, journal={IEEE ACCESS}, author={Schab, Kurt and Jelinek, Lukas and Capek, Miloslav and Ehrenborg, Casimir and Tayli, Doruk and Vandenbosch, Guy A. E. and Gustafsson, Mats}, year={2018}, pages={10553–10568} }
 @inproceedings{schab_yang_adams_2017, title={Antenna bounds for reduced basis problems}, booktitle={2017 International Conference on Electromagnetics in Advanced Applications (ICEAA)}, author={Schab, K. R. and Yang, B. and Adams, J. J.}, year={2017}, pages={855–857} }
 @inproceedings{schab_adams_2017, title={Calculation of radiation transients in direct antenna modulation systems}, booktitle={2017 ieee international symposium on antennas and propagation & usnc/ursi national radio science meeting}, author={Schab, K. and Adams, J.}, year={2017}, pages={521–522} }
 @article{capek_gustafsson_schab_2017, title={Minimization of Antenna Quality Factor}, volume={65}, ISSN={["1558-2221"]}, DOI={10.1109/tap.2017.2717478}, abstractNote={Optimal currents on arbitrarily shaped radiators with respect to the minimum quality factor are found using a simple and efficient procedure. The solution starts with a reformulation of the problem of minimizing quality factor <inline-formula> <tex-math notation="LaTeX">$Q$ </tex-math></inline-formula> as an alternative, so-called dual, problem. Taking advantage of modal decomposition and group theory, it is shown that the dual problem can easily be solved and always results in minimal quality factor <inline-formula> <tex-math notation="LaTeX">$Q$ </tex-math></inline-formula>. Moreover, the optimization procedure is generalized to minimize quality factor <inline-formula> <tex-math notation="LaTeX">$Q$ </tex-math></inline-formula> for embedded antennas, with respect to the arbitrarily weighted radiation patterns, or with prescribed magnitude of the electric and magnetic near fields. The obtained numerical results are compatible with previous results based on the composition of modal currents, convex optimization, and quasi-static approximations; however, using the methodology in this paper, the class of solvable problems is significantly extended.}, number={8}, journal={IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION}, author={Capek, Miloslav and Gustafsson, Mats and Schab, Kurt}, year={2017}, month={Aug}, pages={4115–4123} }
 @inproceedings{jelinek_capek_schab_2017, title={Minimum energy storage in dissipative electromagnetic systems}, booktitle={2017 ieee international symposium on antennas and propagation & usnc/ursi national radio science meeting}, author={Jelinek, L. and Capek, M. and Schab, K.}, year={2017}, pages={41–42} }