Sultan Can

Modified resonant frequency computation for tunable equilateral triangular microstrip patch

In this paper, a new closed form expression is developed to accurately estimate the resonant frequency of an equilateral triangular patch. The proposed computation is also extended to the two-layer structure in order to define the air-gap tuning effect on the resonant frequency. The theory established in this paper is compared with the experimental and theoretical results available in the literature. The results of this study show a considerable improvement achieved over the previous theories within very small percentage errors for almost all cases.

Analysis of the parameters that effects the operating frequencies and bandwidth of a CPW-fed patch antenna

In this study, the analysis of the effect of antenna parameters to the operating frequency is performed in a coplanar waveguide fed patch antenna. The effect of the size and the substrate of the design dual frequency antenna to the operating frequency and bandwidth are also evaluated. Bandwidth of the upper and lower frequency is also investigated and results are demonstrated. The method to increase the bandwidth is also presented by using the chosen parameters.

Design and fabrication of dual-frequency H-shaped antenna

In this study, the parameters that effects the operating frequency of dual frequency H-shaped antenna are examined. These parameters are determined as type of the dielectric constant of substrate, substrate thickness, dimensions of the antenna and dimensions of the slots that are used to obtain shape of H. The produced and simulated results of the proposed antennas are presented and compared with the studies in literature.

Reader antenna design for RFID applications

In this paper, a coplanar waveguide (CPW) fed microstrip patch antenna is designed on finite element method based simulation program and fabricated in order to use reader antenna in Radio Frequency Identification (RFID). The results of the simulations and the produced antennas are presented in the study. The produced microstrip patch antenna has a 105MHz bandwidth and operates in between 895-1000 MHz .

Conformai dual-band frequency selective surface on Textile: Design, prototyping and expriment

In this study, a textile based dual band conformai frequency selective surface has been proposed in order to filter the electromagnetic waves. A commonly known split ring resonator (SRR) is used for unit cell design and an array with 4×6 elements used for planar design presented. The proposed array is bended on a sphere having a radius of 22.45 cm. The performance of the conformal structure is evaluated and compared with the planar one. Measurement results have also been presented.

An equivalent-circuit model of miniaturized split-ring resonator

In this paper, we present a new miniaturized split-ring resonator (SRR) to be easily employed in the practical realization of SRRs and derive its equivalent circuit model to accurately predict the resonance frequency. The results of the resonance frequency obtained by the developed equivalent circuit model are in very good agreement with the simulated results.

Miniaturized wide-band supercell frequency selective surface for LTE band applications

In this study, two wideband metasurfaces for LTE (Long Term Evolution) frequency applications has been proposed. The first design consists of two SRRs (split ring resonators) having gaps in opposite directions; and it has a S21 resonance at 3.7 GHz. The second design has identical SRRs; and it has a S21 resonance at 3.54 GHz. Both designs were realized via a CNC surface drilling tool. Fabricated SRR super cells were measured with WR229 waveguide. Simulated and measured results were compared and presented. By manipulating the capacitance and inductance values, miniaturization was achieved for the second design.

Optically transparent frequency selective surface for filtering 2.6 GHz LTE band

In this study, a frequency selective surface consisting of open ring resonator arrays on glass substrate is proposed for filtering TM-polarized 2.6 GHz frequency band by using equivalent inductance and capacitance expressions and full-wave electromagnetic simulation. The FSS is evaluated for different permittivity, strip and gap width as well as strip length and periodicity values and the transmission response is also verified experimentally.

Conformal frequency selective surfaces design

In this study a conformal frequency selective surface has been proposed for 5.8GHz frequency band and compared with a planer array frequency selective surface in the same sizes. A satisfactory performance has been obtained and a negligible difference has been obtained in terms of frequency and bandwidth when compared to the planer one. The radius of the spherical face that the proposed structure has bended on, is evaluated and the corresponding results proposed as well.

1.8 GHz conformal rectangular microstrip patch antenna design

In this study a 1.8GHz conformal microstrip antenna design is proposed. Conformal antenna and a planer version of the same antenna is compared and discussed. The proposed designs are evaluated via CST Microwave studio suite. Both antennas are evaluated in terms of scattering parameters, directivity, gain, efficiency, input impedance and far field patterns. The proposed conformal antenna achieved to operate at 1.8 GHz with a directivity value of 6.24dBi, a gain value of 5.46dB and an efficiency value of %89.