Design of Microstrip Meandered Dual Mode Wideband Bandpass Filter Using Quarter Wavelength Stubs
01 Sep 2015-pp 307-310
TL;DR: In this article, the authors proposed a new compact microstrip meandered dual mode loop resonator wideband bandpass filter, which is constructed by using bandstop filter with orthogonal direct connected feed lines.
Abstract: This paper proposes a new compact microstrip meandered dual mode loop resonator wideband bandpass filter. The proposed filter is constructed by using bandstop filter with orthogonal direct connected feed lines. The passband is created inside a wide stopband by using the quarter wavelength open circuited stubs which are connected to the opposite sides of the input and output port sides. A small square patch perturbation element is added at right top corner of symmetrical axis of the loop. Perturbation element excites dual degenerate modes thereby improving the selectivity of the filter on both higher and lower side of the passband. Simulated filter is designed at a center frequency of 3.85 GHz shows a very low insertion loss of 0. 3 dB and high return loss of above 17 dB with a wide fractional bandwidth of 55.26 %. The introduced filter is compact with low insertion loss, high return loss and wide bandwidth suitable for modern wireless and satellite communication systems.
Citations
More filters
TL;DR: In this paper, a method for designing a microstrip dual-mode, sharp skirt, wideband bandpass filter with controlled center frequency and bandwidth from bandstop filter topology is discussed.
Abstract: This paper discusses a new method for designing a microstrip dual-mode, sharp skirt, wideband bandpass filter with controlled center frequency and bandwidth from bandstop filter topology. A meander...
1 citations
TL;DR: A novel approach for both center frequency and bandwidth tuning in dual mode Bandpass filter configured from a half wavelength multimode resonator structure using an inter-digital feed structure which provides good input/output coupling.
1 citations
References
More filters
Book•
06 May 2004
TL;DR: In this article, the authors present an analysis and model of ring resonance circuits and their application in the context of filter and filter applications, as well as a comparison of the two types of resonance circuits.
Abstract: Preface.1 Introduction.1.1 Background and Applications.1.2 Transmission Lines and Waveguides.1.3 Organization of the Book.2 Analysis and Modeling of Ring Resonators.2.1 Introduction.2.2 Simple Model.2.3 Field Analyses.2.3.1 Magnetic-Wall Model.2.3.2 Degenerate Modes of the Resonator.2.3.3 Mode Chart for the Resonator.2.3.4 Improvement of the Magnetic-Wall Model.2.3.5 Simplified Eigenequation.2.3.6 A Rigorous Solution.2.4 Transmission-Line Model.2.4.1 Coupling Gap Equivalent Circuit.2.4.2 Transmission-Line Equivalent Circuit.2.4.3 Ring Equivalent Circuit and Input Impedance.2.4.4 Frequency Solution.2.4.5 Model Verification.2.4.6 Frequency Modes for Ring Resonators.2.4.7 An Error in Literature for One-Port Ring Circuit.2.4.8 Dual Mode.2.5 Ring Equivalent Circuit in Terms of G, L, C 352.5.1 Equivalent Lumped Elements for Closed- and Open-Loop Microstrip Ring Resonator.2.5.2 Calculated and Experimental Results.2.6 Distributed Transmission-Line Model.2.6.1 Microstrip Dispersion.2.6.2 Effect of Curvature.2.6.3 Distributed-Circuit Model.References.3 Modes, Perturbations, and Coupling Methods of Ring Resonators.3.1 Introduction.3.2 Regular Resonant Modes.3.3 Forced Resonant Modes.3.4 Split Resonant Modes.3.4.1 Coupled Split Modes.3.4.2 Local Resonant Split Modes.3.4.3 Notch Perturbation Split Modes.3.4.4 Patch Perturbation Split Modes.3.5 Further Study of Notch Perturbations.3.6 Split (Gap) Perturbations.3.7 Coupling Methods for Microstrip Ring Resonators.3.8 Effects of Coupling Gaps.3.9 Enhanced Coupling.3.10 Uniplanar Ring Resonators and Coupling Methods.3.11 Perturbations in Uniplanar Ring Resonators.References.4 Electronically Tunable Ring Resonators.4.1 Introduction.4.2 Simple Analysis.4.3 Varactor Equivalent Circuit.4.4 Input Impedance and Frequency Response of the Varactor-Tuned Microstrip Ring Circuit.4.5 Effects of the Package Parasitics on the Resonant Frequency.4.6 Experimental Results for Varactor-Tuned Microstrip Ring Resonators.4.7 Double Varactor-Tuned Microstrip Ring Resonator.4.8 Varactor-Tuned Uniplanar Ring Resonators.4.9 Piezoelectric Transducer Tuned Microstrip Ring Resonator.References.5 Electronically Switchable Ring Resonators.5.1 Introduction.5.2 PIN Diode Equivalent Circuit.5.3 Analysis for Electronically Switchable Microstrip Ring Resonators.5.4 Experimental and Theoretical Results for Electronically Switchable Microtrip Ring Resonators.5.5 Varactor-Tuned Switchable Microstrip Ring Resonators.References.6 Measurement Applications Using Ring Resonators.6.1 Introduction.6.2 Dispersion, Dielectric Constant, and Q-Factor Measurements.6.3 Discontinuity Measurements.6.4 Measurements Using Forced Modes or Split Modes.6.4.1 Measurements Using Forced Modes.6.4.2 Measurements Using Split Modes.References.7 Filter Applications.7.1 Introduction.7.2 Dual-Mode Ring Bandpass Filters.7.3 Ring Bandstop Filters.7.4 Compact, Low Insertion Loss, Sharp Rejection, and Wideband Bandpass Filters.7.5 Ring Slow-Wave Bandpass Filters.7.6 Ring Bandpass Filters with Two Transmission Zeros.7.7 Pizoeletric Transducer-Tuned Bandpass Filters.7.8 Narrow Band Elliptic-Function Bandpass Filters.7.9 Slotline Ring Filters.7.10 Mode Suppression.References.8 Ring Couplers.8.1 Introduction.8.2 180- Rat-Race Hybrid-Ring Couplers.8.2.1 Microstrip Hybrid-Ring Couplers.8.2.2 Coplanar Waveguide-Slotline Hybrid-Ring Couplers.8.2.3 Asymmetrical Coplanar Strip Hybrid-Ring Couplers.8.3 180- Reverse-Phase Back-to-Back Baluns.8.4 180- Reverse-Phase Hybrid-Ring Couplers.8.4.1 CPW-Slotline 180- Reverse-Phase Hybrid-Ring Couplers.8.4.2 Reduced-Size Uniplanar 180- Reverse-Phase Hybrid-Ring Couplers.8.4.3 Asymmetrical Coplanar Strip 180- Reverse-Phase Hybrid-Ring Couplers.8.5 90- Branch-Line Couplers.8.5.1 Microstrip Branch-Line Couplers.8.5.2 CPW-Slotline Branch-Line Couplers.8.5.3 Asymmetrical Coplanar Strip Branch-Line Couplers.References.9 Ring Magic-T Circuits.9.1 Introduction.9.2 180- Reverse-Phase CPW-Slotline T-Junctions.9.3 CPW Magic-Ts.9.4 180- Double-Sided Slotline Ring Magic-Ts.9.5 180- Uniplanar Slotline Ring Magic-Ts.9.6 Reduced-Size Uniplanar Magic-Ts.References.10 Waveguide Ring Resonators and Filters.10.1 Introduction.10.2 Waveguide Ring Resonators.10.2.1 Regular Resonant Modes.10.2.2 Split Resonant Modes.10.2.3 Forced Resonant Modes.10.3 Waveguide Ring Filters.10.3.1 Decoupled Resonant Modes.10.3.2 Single-Cavity Dual-Mode Filters.10.3.3 Two-Cavity Dual-Mode Filters.References.11 Ring Antennas and Frequency-Selective Surfaces.11.1 Introduction.11.2 Ring Antenna Circuit Model.11.2.1 Approximations and Fields.11.2.2 Wall Admittance Calculation.11.2.3 Input Impedance Formulation for the Dominant Mode.11.2.4 Other Reactive Terms.11.2.5 Overall Input Impedance.11.2.6 Computer Simulation.11.3 Circular Polarization and Dual-Frequency Ring Antennas.11.4 Slotline Ring Antennas.11.5 Active Antennas Using Ring Circuits.11.6 Frequency-Selective Surfaces.11.7 Reflectarrays Using Ring Resonators.References.12 Ring Mixers, Oscillators, and Other Applications.12.1 Introduction.12.2 Rat-Race Balanced Mixers.12.3 Slotline Ring Quasi-Optical Mixers.12.4 Ring Oscillators.12.5 Microwave Optoelectronics Applications.12.6 Metamaterials Using Split-Ring Resonators.References.Index.
298 citations
"Design of Microstrip Meandered Dual..." refers background in this paper
...Many classical bandpass filters such as end coupled, parallel coupled, hairpin, interdigital, combline and stub filters [1] occupy a fairly large area and are very much sensitive to fabrication tolerances....
[...]
TL;DR: In this paper, a bandstop filter based on a ring resonator with direct-connected orthogonal feed lines was proposed for reducing the interference in full duplex systems in satellite communications.
Abstract: This paper presents a new compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filter. A bandstop filter is introduced that uses a ring resonator with direct-connected orthogonal feed lines. A new bandpass filter based on the bandstop filter uses two tuning stubs to construct a wide-band passband with two sharp stopbands. Without coupling gaps between feed lines and rings, there are no mismatch and radiation losses between them and, therefore, the new filters show low insertion loss. In addition, a dual-mode characteristic is used to increase the stopband bandwidth of the new filters. A simple transmission-line model used to calculate the frequency responses of the filters shows good agreement with measurements. The filter using three cascaded rings has 3-dB fractional bandwidth of 49.3%, an insertion loss of better than 1.6 dB in the passband, a return loss of larger than 13 dB from 4.58 to 7.3 GHz, and two rejections of greater than 40 dB within 2.75-4.02 and 7.73-9.08 GHz. The high-performance, compact-size, and low-cost filter was designed for reducing the interference in full duplex systems in satellite communications.
261 citations
TL;DR: In this paper, a dual-mode resonator with square-patch or corner-cut elements located at four corners of a conventional microstrip loop resonator is proposed, where one of these patches or corner cuts is called the perturbation element, while the others are called reference elements.
Abstract: A novel dual-mode resonator with square-patch or corner-cut elements located at four corners of a conventional microstrip loop resonator is proposed. One of these patches or corner cuts is called the perturbation element, while the others are called reference elements. In the proposed design method, the transmission zeros are created or eliminated without sacrificing the passband response by changing the perturbation's size depending on the size of the reference elements. A simple transmission-line model is used to calculate the frequencies of the two transmission zeros. It is shown that the nature of the coupling between the degenerate modes determines the type of filter characteristic, whether it is Chebyshev or elliptic. Finally, two dual-mode microstrip bandpass filters are designed and realized using degenerate modes of the novel dual-mode resonator. The filters are evaluated by experiment and simulation with very good agreement.
248 citations
"Design of Microstrip Meandered Dual..." refers methods in this paper
...Generally, dual mode ring filters are used to design narrowband chebyshev or elliptic filters [3]....
[...]
TL;DR: In this article, the authors presented a novel filter design technique for the compact microstrip dual-mode filters and derived an equivalent circuit for the single dualmode filter section to show that a single unit behaves as a pair of coupled synchronously tuned single-mode resonators.
Abstract: This paper presents a novel filter design technique for the compact microstrip dual-mode filters. An equivalent circuit for the single dual-mode filter section is derived to show that a single unit behaves as a pair of coupled synchronously tuned single-mode resonators. The equivalent circuit was linked to the inverter-coupled bandpass prototype network to allow higher order filters to be realized. A complete design example (from design to realization) of a fourth-order Chebyshev bandpass filter is presented. It is shown that the dual-mode resonator may be employed to design cross-coupled filters with finite frequency zeros. Two filters are designed using optimized coupling matrix method, fabricated and tested. Experimental and simulation results are presented to validate the argument. Finally, it is shown that more compactness may be achieved with narrowband filters by employing folded resonators.
31 citations
17 Dec 2007
TL;DR: In this article, a dual-mode wide-band bandpass filter using the microstrip loop resonators with tuning stubs is proposed, which consists of four identical branches and each branch is a microstrip open-loop element.
Abstract: This paper proposes a dual-mode wide-band bandpass filter using the microstrip loop resonators with tuning stubs. The filter is based on microstrip loop resonator consists of four identical branches and each branch is a microstrip open-loop element. The introduction of two outer tuning stubs connecting opposite to the ports widens the passband and sharpens the stopbands. The microstip loop resonator have a wide stopband resulting from the dispersion effect and the slow-wave effect. The filter is designed at center frequency of 2.35 GHz and simulated by IE3D. The measurement of fabricated structure proposes 36% bandwidth and 0.28 dB insertion loss.
16 citations