Left handed coplanar waveguide band pass filters based on bi-layer split ring resonators (original) (raw)
Related papers
Split ring resonator-based left-handed coplanar waveguide
Applied Physics Letters, 2003
In this letter, a planar left-handed propagating medium consisting of a coplanar waveguide ͑CPW͒ inductively coupled to split ring resonators ͑SRR͒ and periodically loaded with narrow metallic wires is proposed. The wires make the structure behave as a microwave plasma with a negative effective permittivity which covers a broad frequency range. The negative permeability required to achieve left-handed wave propagation is provided by the rings in the vicinity of their resonant frequency. The result is a structure which allows negative wave propagation in a narrow frequency band. The transmission coefficient measured in a fabricated prototype device exhibits very low insertion losses in the pass band and high-frequency selectivity. Since rings are much smaller than signal wavelength at resonance and can be easily tuned, SRR-CPW-based structures are of interest for the design of very compact microwave circuits based on left handedness.
Left-handed metamaterial based on dual split ring resonators in microstrip technology
Proc. Int. URSI …
A new planar left-handed propagating medium consisting on a microstrip line with complementary split ring resonators (SRR) etched on the ground plane that produces a negative dielectric permitivity is presented. The necessary negative magnetic permeability is achieved by capacitive gaps periodically spaced along the strip conductor. Using EM duality theorem, it is shown that a complementary split ring resonator produces an equivalent response to that of a negative dielectric permitivity. In this way, the complete structure permits negative wave propagation in a narrow frequency band. The measured transmission coefficient in the fabricated prototype exhibits reasonable insertion losses in the pass band and high frequency selectivity. Thanks to the sub-lambda operation of the Dual-SRRs and its easy tunability, these structures are a potential candidate for the design of very compact microwave circuits based on left handedness.
Left-handed rectangular waveguide bandstop filters
Microwave and Optical Technology Letters, 2006
A novel type of rectangular waveguide bandstop filter is presented. Incorporating a dielectric slab patterned with single splitring resonators (SRRs), the electromagnetic properties of the structures are modified to allow propagation of backward waves in the rectangular waveguide. Filters are created through integration of SRRs, wireline, and additional metal strips as a loading for the propagation media. Using the printed circuit board (PCB) technique, SRRs, wireline, and metal strips are etched on a dielectric substrate and the slab is then inserted in the central plane of the metallic waveguide. A three-unit cell SRR-loaded waveguide is investigated against a three-unit cell LHM waveguide configuration. A three-unit LHM rectangular waveguide bandstop filter is designed and analyzed in order to performance wide stopband performance. The simulated results are presented for a WG-18 waveguide. LHM rectangular waveguide bandstop filters are compact, low cost, and suitable for mass production.
2015
A compact and sharp rejection UWB microstrip bandpass filter is developed using left handed metamaterials. For realizing a backward-wave propagation medium, two split ring resonator (CSRR) in the back substrate side and also one series capacitor etched in the host line, are used to produce a negative effective e and μ, simultaneously. Moreover, in the proposed structure, two doublets parallel coupling gaps is placed at each side of the series capacitor. In comparison with the other similar filters, this structure shows a significantly wider passband due to the introduction of a cross-coupling between the feed lines (input and output) which generate four pairs of attenuation poles in the passband. On top of that, using two CSRRs and series capacitor leads to the addition of two extra transmission poles at the lower and upper edges of the filter. Consequently, a compact six-pole ultra-wide bandpass filter is designed and fabricated which exhibits extremely sharp rejection skirts arou...
IEEE Transactions on Microwave Theory and Techniques, 2000
This article presents the design and uncertainty analysis of twolayer dichroic employing rectangular slot lattice for a two-channel QON. The discrepancy between the simulated and measured insertion losses can be partly attributed to the fabrication errors, i.e., the ISD variation and the UAE. It is shown that the effect of UAE on the transmission performance is much greater than that of ISD variation, and the transmission performance is more prone to the UAE in the X direction rather than that in the Y direction. Therefore, more attention should be paid to the control of UAE of the two-layer dichroic configuration in the X direction during the fabrication process.
Microstrip structures with behavior of left-handed materials
International Symposium for Design and Technology of Electronics Packages, 2010
New multilayer microstrip structures are investigated in microwave range. Due to the use of stepped impedance resonators (SIR), the multilayer microstrip left-handed transmission lines are more compact than the structures with conventional split ring resonators. The amplitude and phase responses are analyzed for different geometrical parameters, number of cells and dielectric constants of the substrates. It is shown that the investigated structures exhibit left-handed properties in a frequency range near the SIR resonance.
On the Orientation of Complementary Split-Ring Resonators in Left-Handed Microstrip Lines
game.ftn.uns.ac.rs
Split ring resonators (SRR) and complementary split ring resonators (CSRR) are used in left-handed media to obtain negative values of permeability and permittivity, respectively. It is well known that the orientation of SRR positioned next to the microstrip transmission line, significantly influences its performances. However, it is generally accepted that such dependence does not exist in the case of CSRR. In this paper, influence of the orientation of CSRR is analyzed in detail, especially for the case of multiple CSRR geometries. To validate simulation results, left-handed microstrip lines with multiple CSRR are designed, fabricated and measured.