Hybrid-shaped single-loop resonator: a four-band metamaterial structure

Yurduseven, O.
Yilmaz, A. E.
Sayan, Gönül
The aim of this reported work is to demonstrate the feasibility of a miniaturised four-band metamaterial resonator which has potential use in the design of multiband microwave devices such as four-band mobile phone patch antennas. The suggested resonator topology is called the hybrid-shaped single-loop resonator (HSLR) as its unit cell is formed by the combination of square-shaped and triangular-shaped sections of a single piece metal loop printed on a planar low-loss dielectric substrate. The performance of this novel four-band HSLR structure is investigated in comparison to the circular, triangular and square-shaped structures, which are recently reported double or triple band single-loop resonators. Simulations are performed using two different full wave electromagnetic solvers, HFSS and CST Microwave Studio, with excellent numerical agreement.


Dual-Polarization Wideband Sub-6 GHz Suspended Patch Antenna for 5G Base Station
Ciydem, Mehmet; Miran, Emre A. (Institute of Electrical and Electronics Engineers (IEEE), 2020-07-01)
This letter presents a simple, compact, low-cost, low-profile, dual-polarization, suspended patch antenna design to operate in 3.3-3.8 GHz band for 5G base stations. The proposed antenna comprises a main radiating patch, a secondary parasitic patch, modified L-probe feeds, and a vertical metal wall. The main patch is capacitively driven by two feeds for dual (+/- 45 degrees slant) polarization. The vertical metal wall is used to increase the port isolation. The parasitic patch also helps further improvement...
Active clamped ZVS forward converter with soft-switched synchronous rectifier for high efficiency, low output voltage applications
Acik, A; Cadirci, I (Institution of Engineering and Technology (IET), 2003-03-01)
The analysis, design, and implementation of an active clamped ZVS forward converter equipped with a soft-switched synchronous rectifier (ACFC-SR), proposed for high-efficiency low output voltage DC-DC converter applications, is presented. The converter efficiency is maximised due to soft switching of the main, active clamp, synchronous rectifier, and freewheeling MOSFET switches. The operating principles of the ACFC-SR are analysed in detail, and the converter performance is compared with that of alternativ...
Fully Integrated Autonomous Interface With Maximum Power Point Tracking for Energy Harvesting TEGs With High Power Capacity
Tabrizi, Hamed Osouli; Jayaweera, Herath M. P. C.; Muhtaroglu, Ali (Institute of Electrical and Electronics Engineers (IEEE), 2020-05-01)
In this article, a novel fully autonomous and integrated power management interface circuit is introduced for energy harvesting using thermoelectric generators (TEGs) to supply power to Internet of Thing nodes. The circuit consists of a self-starting dc & x2013;dc converter based on a dual-phase charge pump with LC-tank oscillator, a digital MPPT unit, and a 1-V LDO regulator. The novel maximum power point tracking (MPPT) algorithm avoids open-circuit state, and accommodates varying input power and ultra-lo...
E-plane sectoral horn power divider
Secmen, M.; Demir, Şimşek; Hizal, A. (Institution of Engineering and Technology (IET), 2010-02-01)
E-plane sectoral horn power divider design method for high-power antenna array applications is presented. In this method, power division is proportional to the cross section areas of the waveguide channels at the aperture of an E-plane sectoral horn antenna. Two different power dividers are designed and produced to be used with an X-band antenna array having 30 dB Taylor distribution. The first one employs a simple E-plane sectoral horn antenna. This straightforward application of the method might be limite...
Adaptive controller based on grid impedance estimation for stable operation of grid-connected inverters under weak grid conditions
Temiz, Hakan; Keysan, Ozan; Demirok, Erhan (Institution of Engineering and Technology (IET), 2020-10-01)
An electric grid having high impedance seen from the connection point is considered as a weak grid and it adversely affects the system stability of grid-tied voltage source inverters in renewable power devices. In this study, an adaptive controller is proposed by configuring the settling time of the phase-locked loop based on the estimated grid impedance. Pseudorandom binary sequence injection and Fourier techniques are carried out for grid impedance estimation. Impedance-based stability analysis is perform...
Citation Formats
O. Yurduseven, A. E. Yilmaz, and G. Sayan, “Hybrid-shaped single-loop resonator: a four-band metamaterial structure,” ELECTRONICS LETTERS, pp. 1381–1382, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42725.