Ceyhun Karpuz

Ceyhun Karpuz
Pamukkale University · Department of Electorical and Electronics Engineering

Prof. Dr.

About

130
Publications
12,698
Reads
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910
Citations
Additional affiliations
December 2002 - present
Pamukkale University
Position
  • Director of Electromagnetic Waves, Microwave Techniques and Antennas
September 1995 - December 2002
Ömer Halisdemir University
Position
  • Research Assistant
June 1993 - October 1995
Erciyes Üniversitesi
Position
  • Arş. Gör.

Publications

Publications (130)
Article
Full-text available
In this study, a novel microstrip diplexer with four channels is designed by using codirectional split ring resonators (CDSRRs). Since CDSRRs provide dual resonance behavior, dual‐band bandpass filter with two poles at each passband can be created by coupling identical CDSRRs to input/output ports. Based on this approach, quad‐channel diplexer can...
Article
In this article, a novel and simple design procedure for multibit chipless radio frequency identification (RFID) tags is introduced, which is based on the characteristics of dual-mode loop resonator (DMLR) and open-loop resonator (OLR). By removing a small patch element from the symmetry axis of the DMLR, a simple geometrical transition to an OLR t...
Article
Full-text available
In this paper, practical fuzzy models depending on subtractive fuzzy clustering have been presented for asymmetrical V‐shaped microshield line. In addition, a packet program has been introduced to run the proposed fuzzy models. In order to calculate the electrical parameters of each model, a linear equation system has been formed in each fuzzy mode...
Article
Full-text available
A novel compact microstrip diplexer with tunable centre frequencies and reconfigurable filtering characteristics at both channels is presented. The designed diplexer is constructed by coupling two dual‐mode square loop resonators (DMSLRs) having different electrical lengths. The DMSLRs are investigated by virtue of the coupled line analysis to eval...
Article
In this letter, a switchable microstrip quadruplexer based on asymmetrical dual-mode loop resonators (ADMLRs) is presented. Four ADMLRs at different electrical lengths for creating four channels are coupled to input/output (I/O) ports by means of thin film capacitors. Each resonator has two patch elements behaving as reference capacitors that are n...
Article
Full-text available
In this article, a new type of balun bandpass filter with single‐band balance and dual‐band filtering function is presented. For this purpose, a novel compact dual‐mode open loop resonator with short‐circuited stubs and interdigital capacitors is proposed. Two identical resonators are coupled to two output ports in order to obtain 180° phase differ...
Conference Paper
In this paper, a novel microstrip balun bandpass filter with tunable center frequency is presented. The proposed structure is constructed by open loop resonators having varactor diodes. The varactor diodes are used to tune the resonant frequency of the resonators. By virtue of coupled open loop resonators with varactor diodes, two bandpass filters...
Article
In this paper, an electronically switchable quad-band microstrip bandpass filter is designed using varactor perturbed dual-mode resonators. For this purpose, four meandered dual-mode square loop resonators (DMSLRs) having reference patches are nested and varactor diodes are used to serve as perturbation elements. The designed resonator is analyzed...
Conference Paper
This paper presents an electronically tunable filter implementation based on microstrip patch resonator surrounded by an electrical wall to reduce insertion loss of the filter. The dualmode tunable bandpass filter is realized using varactor diode elements. The passband of the filter covers different six states (responses) ranging from 2.0GHz to 2.5...
Article
In this article, a novel dual-mode dual-band bandstop filter design with independently tunable center frequencies is presented by using dual-mode square loop resonators. Tuning operation can be achieved with a constant fractional bandwidth. Varactor diodes are used instead of perturbation and reference elements. Two dual-mode square loop resonators...
Article
Full-text available
In this paper, a novel microstrip diplexer with tunable bandwidths and switchable channels is presented by using dual-mode square loop resonators (DMSLRs). Two resonators at different electrical lengths are coupled to input and output ports with lumped capacitors, and the isolation between the output ports is optimized by means of these capacitors....
Article
This letter presents a quad-band microstrip bandstop filter based on open loop resonators having thin film chip capacitors. For this purpose, dual-mode properties of open loop resonators are used and four independently controllable resonance frequencies are obtained by two open loop resonators in different electrical length. Even/odd mode analysis...
Conference Paper
Full-text available
Günümüzde, robotlar pek çok alanda kullanılmaktadır. Robotikte, biyolojik sürülerinden ilham alınarak ortaya çıkan sürü robotiği yeni bir konu sayılmakla birlikte bu alanda birçok çalışma bulunmaktadır. Bu çalışmada sürü robotiği kavramının tanıtılması ve bu konuda yapılan çalışmaların sunulması amaçlanmıştır. Amaç doğrultusunda öncelikle robotlar...
Article
In this study, a positioning algorithm which is inspired by model matching type positioning systems is presented for swarm robotics. Unlike the conventional model matching systems, the system is designed to be operated as distributed. The algorithm consists of online and offline stages. While specific data collection and positioning are computed in...
Article
Design of a novel ultra-wideband (UWB) microstrip bandpass filter is presented by using a square loop quintuple-mode resonator (QMR) having open-circuited stubs. The proposed resonator has five resonant modes in UWB band range and is coupled to Input/Output (IO) ports by parallel-coupled feed lines. The first three resonance modes are resulted from...
Conference Paper
Full-text available
In this letter, design of a quad-band microstrip bandpass filter is presented by using nested placed four dual-mode square loop resonators (DMSLR) having different electrical lengths. Arms of the square loop resonators (SLR) are formed with low/high impedance parts, in order to obtain a maximum miniaturization by nesting DMSLRs and perturbation eff...
Conference Paper
In this letter, design of a highly selective six-pole microstrip bandpass filter with low insertion loss is reported. For this purpose, a new type of triple-mode open loop resonator having patch loaded open-circuited stubs is designed and analyzed through even-odd mode resonance conditions. Designed resonator is coupled to input and output ports to...
Article
This paper proposes an efficient fuzzy modeling approach based on subtractive clustering for accurate calculation of the quasistatic parameters of asymmetric coplanar waveguides (ACPWs). The fuzzy model tracks the steps of clustering, preparation of rule based linear equation system and parameter optimization. A comparison between this paper's resu...
Article
In this letter, a dual-mode dual-band microstrip bandpass filter design with center frequency control methodology is presented by using dual-mode meandered loop resonator. Center frequencies of the passbands can be controlled by changing the connection points of internally located square loop loading elements without changing the total surface area...
Article
In this article, a novel dual-mode wideband bandpass filter having tuning stubs is proposed. Proposed filter has two stopbands in the lower and higher sides of the passband as the filter is configured as a bandstop filter by using direct-connected feedlines. Hence, a passband can be created inside a wide stopband by means of the open-circuited stub...
Article
This article presents even–odd mode impedance/admittance descriptions for dual-mode multiband filters having independently controllable passbands formed by multiple resonators in different electrical lengths. Even–odd mode impedance models of dual-mode ring resonators are used. Using these models, conventional equivalent admittance formulas are rev...
Article
This article proposes a dual-band bandpass filter exhibiting negative effective magnetic permeability as well as effective negative electric permittivity. The proposed filter is constructed by loaded open-loop resonators (OLR). Input and output ports are connected to each other with a grounded feedline having two via holes located at the tapping po...
Conference Paper
In this letter, the effect of open-circuited stubs on the frequency response of a microstrip square loop resonator shaped as a meander form is investigated with a full-wave electromagnetic (EM) simulator and a triple-mode microstrip bandstop filter is designed by using this effect. Proposed filter configuration is consisted of a microstrip square l...
Conference Paper
A novel microstrip dual-mode bandstop filter with Coplanar Waveguide (CPW) fed structure is proposed by using a microstrip square loop resonator. Two types of coupling between the degenerate modes are described by changing the perturbation's sizes as in conventional ones. The difference between the proposed filters and conventional ones is resonato...
Conference Paper
Full-text available
A novel compact quad-band microstrip bandstop filter design is presented. Input and output ports of the filter are connected with a high impedance transmission line. Proposed filter is designed by using open-circuited stubs attached to the input and output ports. Thus, based on the fr − 3fr harmonic property of the stub-loaded resonators, four stop...
Conference Paper
Full-text available
In this paper, a novel compact multi-band bandpass filter design is realized by using a microstrip meander square loop resonator and open-circuited stubs which are located at 0°–90°–180°–270° according to the excitation ports. The proposed resonator structure can be used to design wideband bandstop filter with two notch bands or quad-band bandpass...
Article
Full-text available
In this letter, L-shaped conductor backed asymmetric coplanar stripline (LSCBACPS) and U-shaped conductor backed coplanar waveguide (USCBCPW) branch line coupler fed by microstrip transmission line have been investigated for the miniaturization. The number of interdigital finger unit cells located at the branch and through lines of the conventional...
Article
n this article, a novel compact dual-mode resonator formed by a square loop having folded arms and mitered bends is proposed.Degenerate modes can be excited by shifting the gaps between the folds. Thus, the center frequency can be arranged at a fixed value because the total electrical length of the proposed configuration is not changed. A novel com...
Article
Design and fabrication of compact dual-mode dual-band microstrip bandpass filters with a novel feed scheme is presented. The proposed filters have two square loop resonators for two passbands, and each resonator is fed by the feedlines located at the upper corners of the resonators. By using the perturbation elements such as patches or corner-cuts,...
Article
In this letter, the effect of narrow slits on resonance characteristics for a microstrip square loop resonator (SLR) with mitered bends is investigated and a new formula to calculate the resonance frequency of SLRs loaded inductively by means of slits is derived as a function of the number of slits.A novel dual‐mode SLR configuration performing a s...
Conference Paper
Artificial Neural Network computational modules have recently gained recognition RF and microwave modeling. This situation is very important for computer aided tuning of microwave components. Neural networks can be trained to learn the behavior of passive/active components/circuits. This paper presents a design approach for a microstrip dual mode f...
Conference Paper
Full-text available
In this paper, by using microstrip resonators having dual-mode characteristics, a novel dual-band bandpass filter is presented. Designed resonator structures have been formed by placing a couple of open-circuited stubs to the corner points of a square loop resonator. By means of movement of the gaps between the open ends to obtain a perturbation ef...
Conference Paper
A novel feed scheme is presented to design a dual-mode dual-band microstrip bandpass filter. The proposed filter has two square loop resonators for both passbands and each resonator are fed by a feedline placed on the upper corners of resonators. Proposed structure allows controlling each passband separately in terms of mode frequencies and transmi...
Article
Full-text available
In this work a unique design and construction of Electro Magnetic Shielding Efficiency (EMSE) measurement set is introduced and its reliability is discussed within the circumstance of the produced electrical conductive textile surfaces. Electrical conductive yarns, that are contending copper wire, silver and cotton staple fibers, are spun and used...
Article
Full-text available
ANN has a wide application areas. One of these applications areas is the optimization of microwave filters. In this study, of optimization ANN solution techniques have been applied to optimize RF and microwave structures Using Artificial neural networks (ANN) modeling technique in a filter design with the inset-feeding open-loop resonator is presen...
Conference Paper
Full-text available
In this paper, by using microstrip resonators having dual-mode characteristics, a novel dual-band bandpass filter with elliptical filter characteristics is presented. Designed resonator structures have been formed by placing a couple of open-circuit ended edge lines to the corner points of a square loop resonator. By means of movement of the gaps b...
Conference Paper
Full-text available
This paper presents a new class of microstrip bandstop resonator filters. The folded open-circuited stub resonator located into microstrip loop structure is investigated using full-wave electromagnetic simulations. The utilization of the novel stub resonator allows a compact bandstop filter configuration to be realized. The proposed filter not only...
Conference Paper
Full-text available
A novel simple and understandable topology is proposed for dual-mode dual-band bandstop filters with asymmetric frequency response. Two microstrip square loop resonators are used to obtain the dual-band filter characteristic. Each resonator uses a perturbation element to excite dual-modes. Distinct characteristics of new filters are investigated us...
Conference Paper
A compact dual-band microstrip bandpass filter is proposed using dual-mode resonators. Two microstrip loop resonators, one within the other, are employed to obtain dual-mode dual-band filter responses. Each loop resonator uses two loading elements to excite dual modes. Distinct characteristics of these new types of dual-mode filters are investigate...
Article
Full-text available
Dual-mode microstrip bandstop filter, which has an in-ductive or capacitive perturbation element located at one of its corners, with a 90°-bended /4 microstrip feeding line is proposed. The degenerate mode splitting of a conventional dual-mode square loop resonator and the coupling coefficient between these modes are investigated. The filter charac...
Conference Paper
DMDBFs were proposed for miniaturization and asymmetric frequency characteristic. The consisting of two DMRs based on microstrip square loop resonators was fed by a common T-shaped nonorthogonal I/O feed lines located on the horizontal symmetry axis. It was shown that the TZs can be moved from one side of passband to the other side by adjusting the...
Conference Paper
In this study, we proposed a novel bandstop filter using a square loop resonator. Dual-mode microstrip bandstop filters are designed and realized by employing two degenerate modes of a dual-mode microstrip square loop resonators. Microstrip loop resonators have been used extensively for bandpass filter applications. Dual-mode microstrip resonator i...
Conference Paper
We report the results of an investigation into dual-mode operation of microstrip loop resonator based on meander slow wave structure, and its applications for designing miniature dual-mode bandpass filters. A new feed arrangement for the miniature dual-mode filters is also proposed and investigated in detail. The feed arrangement supports the propo...
Article
A new type of dual-mode microstrip square-loop resonator that produces asymmetrical frequency responses is proposed. The coupling between degenerate modes of the proposed dual-mode resonator is discussed depending on the perturbation size. The effect of non-orthogonal input/output feed lines located along a straight line on the frequency response i...
Article
Dual-mode microstrip filters with asymmetric filter characteristic employing two rectangular loops within a single mode microstrip square loop resonator were proposed. Two filter designs with a finite-frequency transmission zero on either side of the passband were demonstrated with EM-simulated and measured results. The positive and negative coupli...
Conference Paper
A compact microstrip dual-mode resonator is proposed for asymmetric response filter applications. The proposed microstrip dual-mode resonator that has form of a quasi-meander shaped loop resonator is investigated using a full-wave electromagnetic simulator. It is found that the degenerate modes, i.e., the odd and even modes, within this dual-mode r...
Conference Paper
A new type of dual-mode resonator that produces asymmetrical frequency responses is proposed. The effect of nonorthogonal input/output feed lines located along a straight line on filter response is investigated for the dual-mode filter. The coupling between degenerate modes of the proposed dual- mode microstrip resonator is discussed depending on t...
Conference Paper
This letter describes a novel filtering function for linear phase dual mode filters with nonequi-ripple. Filter selectivity is easily adjusted to provide higher level near the band edges by the redistribution of the reflection zeros in the passband in relation with the location of the transmission zeros in the stopbands. Proposed filtering function...
Conference Paper
To reduce the size of microstrip dual-band bandpass filters (DBBPFs) by keeping excellent performance, a novel DBBPF configuration is proposed. The novel DBBPFs include two dual-mode resonators based on square loop structure that are located one within the other to remove extra circuit area. The square open-loop stubs connected at the end of feed l...
Article
In order to reduce the size of dual-mode microstrip filters by keeping excellent performance, novel filter geometry is proposed. The novel filter includes a dual-mode resonator based on a meander structure. The effect of input/output feed lines located along a straight line on filter response is investigated for the dual-mode filter. The coupling b...
Conference Paper
Novel diplexer and dual-band filter using a squire open-loop with inset feeding and folded lines are proposed for wireless communication systems. These structures have a compact size. Simulations and experimental results have verified that these structures provide a good performance to be have single pair of transmission zeros at finite reel or ima...
Article
A novel dual-mode microstrip filter operating at 900 MHz is proposed using degenerate modes of a microstrip-loop resonator. The resonator structure that is formed of meandered microstrip-line elements has a smaller size than the other dual-mode microstrip resonators in the literature. The dual-mode filter is verified by both simulation and measurem...
Article
A reduced-size bandstop filter is proposed using two meandered or bended λg/4 open-circuited shunt stubs. A double-length transmission-line element (TLE) is used as a connecting line between these stubs in order to obtain a wider stopband than that of the conventional filter with a single-length TLE. The meandered or bended double-length connecting...
Article
A novel dual-mode uniplanar square slot-loop resonator, using an inset-coupling mechanism with capacitive gaps is proposed. The mode splitting of the uniplanar resonator is described with respect to the perturbation size. A dual-mode uniplanar filter using such a resonator is designed and fabricated with 5% bandwidth at the center frequency of 2.97...
Article
A novel type of dual-mode microstrip bandpass filter using degenerate modes of a dual-mode microstrip square loop resonator with capacitively loaded open-loop arms is proposed. Such a dual-mode bandpass filter with a 0.75% bandwidth at the center frequency of 1.603 GHz is designed and fabricated to demonstrate the design of reduced-size microstrip...
Article
Full-text available
A uniplanar wideband bandstop filter is proposed using two bent open-end stubs. The proposed filter consists of the bent connecting line of /spl lambda//sub g//2 between two bent /spl lambda//sub g//4 stubs, which results in wideband design with a rejection bandwidth of 90% at 2.05 GHz. Further, the connecting line and stubs have the same character...