Pseudo elliptic dual-band filters based on ring structures / Zuhani Ismail Khan (original) (raw)
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IJERT-Dual-band and tri-band filter design for multi-band communication systems
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/dual-band-and-tri-band-filter-design-for-multi-band-communication-systems https://www.ijert.org/research/dual-band-and-tri-band-filter-design-for-multi-band-communication-systems-IJERTV2IS100729.pdf This paper presents dual and tri band pass filter. These filters are designed by using folded stub loaded resonator technique. The second and third bands are affected by the inner stubs inserted in a random position to make it feasible to self control on the electrical features. The central frequencies are obtained in two and three bands are in equal intervals. Insertion loss and attenuation are very less and high out of band rejection capability is observed. The center frequencies are located to design are 2.1 GHz, 3.77 GHz for dual band pass filter designing and tri band central frequencies are expected as 2 GHz, 4.5 GHz and 7.6 GHz. Good pass band is obtained. Results are compared using simulation process and theoretical analysis. We will simulate the results by considering all the theoretical parameters and then synthesizing will be done to give the performance by comparison. High selectivity will result better performance.
Novel Transformation to Design Dual-Band Filters
International Conference on Aerospace Sciences and Aviation Technology
This paper introduces novel derived transformation equations to design dual-band filters. The design utilizes the approach adopted for dual-band bandpass filter design based on asymmetric half-wavelength resonator. The obtained optimized filter by this approach is used as a reference and the proposed transformation is applied to calculate the new filter design hardware parameters that satisfy its given specifications. Two dual-band filters are demonstrated by using this transformation. The reference dual-band filter is designed to have: bandwidths of 96 MHz and 185 MHz at the central frequencies 2.1 GHz and 5.6 GHz for UMTS/ Wi-MAX applications, respectively. Another two dual-band filters for GPS/WiLAN and GPS/Wi-MAX applications are illustrated to verify the transformation technique. The momentum simulations for these filters show that the specifications are: bandwidths of 85 MHz and 100 MHz at the central frequencies 1.575 GHz and 5.8 GHz for the first one while bandwidths of 95 MHz and 100MHz at the central frequencies 1.5 GHz and 3.8 GHz for the second filter, respectively. All the results are obtained using circuit and momentum simulation of the Agilent Design Simulator (ADS) package.
A Novel Design of Compact Dual-Band Bandpass Filter for Wireless Communication Systems
Wireless Personal Communications, 2019
In this paper, design, fabrication, and measurement of a new microstrip dual-band bandpass filter with compact size and high selectivity characteristics for modern wireless communication systems is presented. The filter structure is composed of folded non-uniform meander resonators along with defected ground structure patterns. The proposed filter with a total size of 14.43 × 9.04 mm 2 is designed to exhibit two passbands centered at 2.18 GHz and 5.12 GHz with fractional bandwidths of 16.2% and 6.48%, respectively. The measured insertion losses are about 1.13 dB and 2.65 dB at the lower and upper passband, respectively. The simulation and experimental measurement results are basically in good agreement which validate the proposed approach.
Design of a microwave dual-band filter using frequency sele ctive surfaces
20th Iranian Conference on Electrical Engineering (ICEE2012), 2012
A dual-band frequency selective surface (FSS) made of double ring is presented. The design has been carried out with one layer of FSS. In the first step, two single band FSSs with different radii rings were designed for two resonant frequencies of 7 GHz and 4.8 GHz with a 20 dB bandwidth of 0.3 GHz around each frequency. In the second step, the two rings were merged to obtain a dual-band FSS. The proposed dual-band FSS is a compact structure that is stable against angle and polarization of incident wave with a rejection level better than-20 dB in the bands.
2017
In the Bandpass filter two open stepped impedance resonator is introduce with help of dual band pass filter. The proposed filter having an extra added two open stabbed impudence resonator in inside the substrate and the filter design is designed for input output transmission lines where structure is totally coupled. Through this theoretical analysis and full wave simulation, we proceed SLR is ready to have the beneficial that odd mode resonant frequency and perhaps even mode are fixed. Dual bandpass filter is a simulated design of microwave dual bandpass filter is operating at its centre frequencies (1.75, 2.83) GHz which make this filter liable candidate of dual Bandpass filter. The insertion loss less than -5dB. An s-parameter result proposed filter has been simulated correctly which shows remarkable characteristics of microwave dual bandpass filter using SISRs. A dual bandpass filter is design to the dual part wireless communication .Warless network IEEE802.11b operates at 2.4 GH...
Concept of Dual-Band Bandpass Filters with Antiparallel Configuration
This paper explores the application of band pass filters with antiparallel configurations for obtaining dual band filters of compact sizes and various characteristics. The previously developed model for filters with antiparallel configuration is enhanced by replacing the ideal inductances with transmission lines. The characteristic impedance of the transmission lines is introduced as an additional independent parameter that affects the occurrences and the position of the parasitic passband at higher frequencies. This property is implemented within a program for electrical circuit simulation to obtain a model of dual band bandpass filter with tunable characteristics and a simultaneous calculation of values for all components of an ideal circuit model. The obtained component values of the filter prototype can be scaled to an arbitrary microwave frequency.
– A Filter block has been highly attention due to it's highly importance in wireless communication systems. High harmonic level normally companies with the performance of the filter block. The use of both low-pass or band-stop filter and the step-impedance lines methods to reduce the spurious characteristics of the filter are not a practical solutions since that adds more complexity and large in size. On the other hand, multiband components are preferable in most modern wireless system applications. In this paper, a single unit cell of a complementary split ring resonator designed on the ground plane of the conventional five pole bandpass filter has been proposed and considered as more practical method to excite the second bandpass frequency band and to solve the important filter problem in terms of third order harmonic characteristic suppression (3fo). The final structure has been simulated using the CST Microwave Studio. The simulated result for the proposed construction was extracted and displayed together with the measured result of the conventional five pole prototype structure. The outputs showed good agreement between them also return loss enhancement is very clear through the combination between the complementary split ring resonators and band pass filter. Other advantages no complexity adds, and low in effective cost.
Design of Dual and Triple-Passband Filters Using Alternately Cascaded Multiband Resonators
IEEE Transactions on Microwave Theory and Techniques, 2006
A novel method for designing multiband bandpass filters has been proposed in this paper. Coupling structures with both Chebyshev and quasi-elliptic frequency responses are presented to achieve dual-and triple-band characteristics without a significant increase in circuit size. The design concept is to add some extra coupled resonator sections in a single-circuit filter to increase the degrees of freedom in extracting coupling coefficients of a multiband filter and, therefore, the filter is capable of realizing the specifications of coupling coefficients at all passbands. To verify the presented concept, four experimental examples of filters with a dual-band Chebyshev, triple-band Chebyshev, dual-band quasi-elliptic, and triple-band quasi-elliptic response have been designed and fabricated with microstrip technology. The measured results are in good agreement with the full-wave simulation results.
2011
The paper is focused on the design of broadband bandpass filters at microwave frequencies. The proposed filters are based on a combination of open split ring resonators (OSRRs) and open complementary split ring resonators (OCSRRs) loaded in a host transmission line. Since these resonators (OSRRs and OCSRRs) are electrically small, the resulting filters are compact. As compared to previous papers by the authors on this topic, the main aim and originality of the present paper is to demonstrate that by including a new series inductance in the circuit model of the OCSRR, it is possible to improve the predictions of these filter models and better fit the measured filter responses. Moreover, the parameter extraction method of the new circuit model and an automated filter design technique is introduced and demonstrated. The paper is complemented with the design and comparison of several prototypes.
New topologies for planar microwave band-pass filters with strongly asymmetric characteristics
2009 International Semiconductor Conference, 2009
In this paper the problem of designing simple lowcost planar microwave band-pass filters with strongly asymmetric characteristics, filters that can very efficiently attenuate an adjacent channel, is investigated. For a fourthorder filter, the usual quadruplet structure leads to two transmission zeros, located one on each side of the passband. For one of the two adjacent channels, a higher attenuation can be obtained by designing filters with two transmission zeros with prescribed positions in the same stopband (upper or lower). The new topology investigated in this paper offers the possibility of designing such quadruplets with two transmission zeroes situated both on the same side of the passband, in prescribed and controlled positions. Filters with this novel structure can provide very high attenuation not only at a single frequency, but in a larger adjacent frequency band.