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It has been previously demonstrated in optical fiber that superimposed chirped gratings can be used to implement multi-frequency transmission filters. In this paper, we propose an equivalent electrical implementation of this structure for use in microstrip technology. In an analogous fashion to an optical fiber grating, we modulate the strip-width of a 50-ohm microstrip according to the sum of two...
A new Spiral Electromagnetic Band-Gap (SEBG) structure is proposed in this paper. The monofilar, bifilar, quadrifilar spiral geometries are investigated by full-wave numerical simulations. The new structure has many degrees of freedom for close-fit designs. Only two unit cells of SEBG structure are sufficient in order to achieve a relatively good band-gap performance, which makes it compact in overall...
A tunable microstrip bandgap device with plasma elements is designed and experimentally characterized. A straight microstrip waveguide with patterned holes in the copper ground plane form a photonic bandgap structure, with an operating frequency of 2 GHz–10 GHz. ANSYS HFSS simulations were performed to characterize the transmission characteristics of the device. A switchable plasma element is integrated...
Numerically and experimentally demonstrated the appearance of the Tamm States peak in the band gap of a planar photonic crystal. The increasing of quality factor as well as Tamm State frequency falling with rising of inhomogeneity length is demonstrated.
A simple and efficient transition from microstrip to printed ridge gap waveguide for millimeter-wave band is proposed. The transition covers the complete available bandwidth provided by ridge gap waveguide. The transition is used for feeding and measurement of a bandpass filter. Measured results are in good agreement with the simulation.
Surface wave suppression properties of Perforated Artificial Impedance Surfaces (PAIS) are investigated. It is shown that, by a proper choice of perforation geometry, surface wave propagation can be suppressed without the need of vias. This significantly decreases fabrication costs. It is also possible to overlap the surface wave suppression and reflection phase bands of the PAIS. Due to the rotational...
A simple and effective method to attenuate the propagation of switching noise within a power delivery network (PDN) on PCB-level is to use an electromagnetic band-gap structure (EBG). To determine the limit frequencies of the band-gap, an accurate model of the structure is necessary. This paper exploits the fact, that the patches of the EBG are electrically small at the frequency range below the band-gap...
This paper presents a way to enable extended passive structures in stripline technology by means of controlling the parallel plate modes in the desired frequency band of operation. This is achieved by periodic structures of the Sievenpiper type. They enable microstrip-to-stripline transitions that were previously very difficult to realize at very high frequencies. Simulated and measured data is given...
The popularity of microstrip antennas are increasing day by day because of easy analysis and fabrication, and their attractive radiation characteristics microsrip antenna using simple electromagnetic band gap (EBG) substrate has higher gain than conventional microstrip antenna In this paper we propose to mushroom like Electromagnetic Band Gap (EBG) structure with different diameter of vias was designed...
The techniques in the parameter retrieval procedure based on Nicolson-Ross-Weir (NRW) approach are discussed for asymmetric composite right/left-handed transmission line (CRLH TL). A 10mm-long microstrip transmission line is calculated by the revised method for validation and comparison. An improved lumped parameter extraction in equivalent circuit modeling is proposed for unbalanced CRLH TL. The...
A novel electromagnetic band gap (EBG) scheme is presented for size reduction. The proposed structure can be considered as a modification of typical mushroom structure with the shorted vertical pin replaced by a helical via. Transmission characteristics of the proposed topology are obtained by using suspending microstrip method. The helical-via-type mushroom structure provides additional degrees of...
Effect on the electromagnetic bandgap (EBG) of an active, tunable, EBG structure, due to the insertion loss and other scattering parameters of active switching devices, is investigated. Active FET switches are modeled two ways, first as perfect conductors with the switch packaging and secondly as a black box with embedded scattering parameters provided by the switch manufacturer. The results obtained...
In this paper, a miniaturized microstrip antenna array with two patches is proposed for wearable MIMO systems. The array is designed to resonate at 4.2 GHz and 8.1 GHz for biomedical micro-sensing technology and biomedical diagnostics applications, respectively. In this paper, the use of a diagonal slot on the microstrip patch to reflect the surface current in a direction opposite to that of the neighboring...
Polarization-controllable zeroth-order-resonator antenna with reactance loads at both ends is proposed and demonstrated. The zeroth-order resonator antenna is composed of a microstrip-line-based composite right/left handed transmission line with reactive loads. The impedance of one load is the complex conjugate of another. By changing the end condition under the resonance, superposition of energies...
Wide-band matching of a tunable 1D periodic microwave structure, designed for fabrication in GaAs technology, is investigated. The two-layer unit cell of the periodic structure consists of a microstrip line loaded by multiple rectangular patches, which can be selectively short-circuited. The wide variation of the position of the bandgap, obtained by electrically controlled switches, induces a large...
Suspending micro strip line method is applied to predict the stop band characteristics of the rectangular spiral EBG structure. Effects of height and width of the suspending micro strip line on stop band data, including center frequency and bandwidth, are considered. To investigate this method in detail, a 5 × 5 mushroom-like EBG structure is fabricated. The measured stop band results are compared...
A novel slow-wave structure for microstrip lines is proposed. Unlike conventional slow-wave structures such as photonic bandgap (PBG) and ladder microstrip lines, which only deal with the substrate, ground plane or the signal line of a microstrip separately, the periodic patterns of this new slow-wave structure are etched in both the conductive metal strip and the ground plane of the proposed microstrip...
This paper presents new topics that will be lectured in the short course Metamaterials for Antennas within the European School of Antennas in Spring 2012. These relates to new so-called gap waveguides that are advantageous for use above 30 GHz, because they are quasi-TEM over wide bandwidth, and do neither require dielectric material nor conductive joints between metal parts. The gap waveguides originate...
Dynamically changing the position and width of the electromagnetic band gap of a periodic microwave structure is investigated. The one-dimensional structure consists of twenty four unit cells. It has two dielectric layers: a relatively thick Alumina bottom layer and a thin Polymide top layer, with a thickness ratio of 25:2. There is a microstrip on the top surface. Metal patches, sandwiched between...
A parametric study of a high impedance surface built in microstrip technology is reported and the feasibility of an electronically switched parallel-plate waveguide is demonstrated. Full wave electromagnetic simulation is used for obtaining relevant parameters and for operation demonstration.
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