In this paper, a novel multi-permittivity cylindrical dielectric resonator antenna for wideband application is presented. The multi-permittivity cylinder is formed by combining two different permittivity material sectors in such a way that each sector (with constant permittivity) is 90 degree apart. A direct microstrip line coupling terminated with T-stub at the open end is used to excite the m...

We report on the high frequency complex permittivity characterization of single-walled carbon nanotubes (SWNT) using broadband and narrowband frequency range techniques. SWNT suspensions, powder and fiber were investigated and the samples were a mixture of semiconducting and metallic nanotubes. Shielded opencircuited coaxial probe (50 MHz to 10 GHz) and dielectric microwave resonators were deve...

We numerically demonstrate that spoof localized surface plasmons (LSPs) resonant modes can be enhanced based on ultrathin corrugated metal-insulator-metal (MIM) ring resonator. Further enhancement of the LSPs modes has been achieved by incorporating an efficient and ease-of-integration exciting method. Quality factors of resonance peaks have become much larger and multipolar resonances modes ca...

The application of a waveguide-ring resonator based on dielectric-loaded surface plasmon-polariton waveguides as a temperature sensor is demonstrated in this paper and the influence of temperature change to the transmission through the waveguide-ring resonator system is comprehensively analyzed. The results show that the roundtrip phase change in the ring resonator due to the temperature change...

A wide, multimode segment of a dielectric optical waveguide, enclosed by Bragg reflectors and evanescently coupled to adjacent port waveguides, can constitute the cavity in an integrated optical microresonator. It turns out that the device can be described adequately in terms of an approximate coupled mode theory model which involves only a few guided modes as basis fields. By reasoning along t...

Background. A further increase in the speed of information transfer is determined by more stringent requirements for elements communication devices. One most important components such devices various filters, which are often made on basis dielectric resonators. Calculation parameters multi-section filters impossible without development theory their design. The filter based electrodynamic modell...

In this paper, a three ring-resonator serially coupled is considered as an optical filter. We are going to improve the performance of the designed optical filter by increasing the quality factor and finesse of filtered wavelengths. The first and last rings are coupled to the bus waveguides that carry the input and output fields. The effect of coupling parameters and ring radii on the filtering ...

The emission properties of a porous silicon layer placed in an optical microcavity is investigated by photoluminescence and time resolved photoluminescence measurements. The microcavity is formed by an all porous silicon Fabry-Perot filter made by two distributed Bragg reflectors separated by a h or h/2 porous silicon layer. Our main findings are that the spontaneous emission spectrum is drasti...

Abstract—This paper presents a novel compact microstrip hybrid four-mode bandpass filter (BPF) with good selectivity and multitransmission zeros. By adding an external resonator to a triplemode stub-loaded resonator, four modes are generated in the desired passband and a hybrid four-mode BPF is implemented. Oddand even-mode theory is introduced to investigate the mode characteristics of triple-...