2026-05-31T07:22:14Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/384532026-02-03T11:09:40Zcom_10630_2254col_10630_37953

00925njm 22002777a 4500 dc Palomares-Caballero, Ángel author Pérez-Escribano, Mario author Molero, Carlos author Padilla, Pablo author García-Vigueras, María author Gillard, Raphaël author 2025 This paper explains the non-idealities that arise when using PIN diodes at millimeter-wave frequencies and the important limitations that they bring in classical configurations of 1-bit slotline reconfigurable unit cells. A robust solution is proposed where a single PIN diode is inserted inside a ring topology. The slotline unit cell is analyzed through a circuit-model approach. Its performance is compared with a unit cell based on a single slotline, which also includes a PIN diode, referred to as classical configuration. For experimental assessment, a circuit prototype is fabricated to verify the phase difference of both PIN diode states in each unit cell configuration. The measured results reveal that the slotline unit cell with ring configuration provides a 180° ± 20° reflection phase difference from 36.3 GHz to 45 GHz (21.4% relative bandwidth). Finally, the proposed slotline unit cell with ring topology is measured in a complete array to assess its performance in periodic and quasi-periodic environments. The measurements confirm the 1-bit behavior for both normal and oblique incidence with losses less than 2 dB. Therefore, this enables the design of wideband 1-bit reconfigurable reflectarrays and RIS in this frequency range. Á. Palomares-Caballero, M. Pérez-Escribano, C. Molero, P. Padilla, M. García-Vigueras and R. Gillard, "Broadband 1-bit Reconfigurable Intelligent Surface at Millimeter Waves: Overcoming PIN-Diode Degradation with Slotline Ring Topology," in IEEE Transactions on Antennas and Propagation, doi: 10.1109/TAP.2025.3558424. https://hdl.handle.net/10630/38453 10.1109/TAP.2025.3558424 Redes de banda ancha Antenas Broadband 1-bit Reconfigurable Intelligent Surface at Millimeter Waves: Overcoming PIN-Diode Degradation with Slotline Ring Topology.