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A high isolation quad-channel microstrip diplexer based on codirectional split ring resonators
(Wiley, 2022) Gorur, Ali K.; Turkeli, Alper; Buyuktuna, Mert; Dogan, Engin; Karpuz, Ceyhun; Gorur, Adnan
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 be designed by coupling two more CDSRRs in different electrical length to another output. Both filters are fed by similar feeding lines. High isolation can be observed between the output ports by means of CDSRRs. The designed quad-channel microstrip diplexer was also fabricated and tested for experimental verifications. The measured results are in a good agreement with the simulated results. Center frequencies of the channels were measured at 2.12, 2.45, 3.90, and 4.48 GHz with the minimum insertion losses of 2.27, 2.88, 2.00, and 2.71 dB, respectively. Isolation was observed as better than 44 dB from DC to 6 GHz.
A New and Simple Approach on Multi-Resonator Circuit Based Chipless RFID Tags for IoT Applications
(IEEE, 2020) Dogan, Engin; Gorur, Ali Kursad; Karpuz, Ceyhun; Gorur, Adnan
In this paper, a novel multi-resonator circuit as a chipless RFID tag is proposed for internet of things (IoT) applications. For this purpose, a simple geometrical transition between a dual-mode square loop resonator (DMSLR) and an open loop resonator (OLR) is introduced by means of a small patch. Two frequency codes can be obtained from a DMSLR, since it has two resonance frequencies. On the other hand, while an OLR is utilized, only one frequency code can be obtained. Thus, totally 3 frequency codes can be achieved from one resonator in a very simple way and 3(N) codes can be achieved by using N resonators. For demonstration, two circuits including 4 resonators were fabricated and tested.
A Novel Bandstop Filter Design with CPW-Fed Microstrip Square Loop Resonator
(IEEE, 2013) Gunturkun, Elif; Gorur, Adnan; Karpuz, Ceyhun
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 resonator fed structures. In the proposed filter design method, CPW-fed structure is used to excite the degenerate modes of the resonator with degenere modes of the square loop resonator. Finally, two dual-mode bandstop filters are designed and realized with using degenerate modes of the microstrip square loop. It is shown that the size of the perturbation element determines the location of the reflection zeros of the filter according to the coupling type of the resonator.
A Novel Compact Microstrip Diplexer with Closely Spaced Channels
(IEEE, 2020) Gorur, Ali Kursad; Turkeli, Alper; Dogan, Engin; Karpuz, Ceyhun; Gorur, Adnan
A novel microstrip diplexer with closely spaced channels is introduced by using stub loaded dual-mode square loop resonators (DMSLRs). The proposed resonator is constructed by locating open-circuited stubs with narrow slits to the midpoints of a conventional DMSLR to achieve size reduction. By changing the number of narrow slits, resonant frequencies of the proposed resonator can be controlled. In order to design a diplexer with low channel frequency ratio, two stub loaded DMSLRs having different number of narrow slits are coupled to input and output ports by thin film capacitors. The designed diplexer was also fabricated and measured with a channel frequency ratio of 1.10. The channels were measured at 1.78 GHz and 1.96 GHz with the fractional bandwidths (FBW) of 5.4% and 5.3%, respectively. The measured insertion losses of the channels are 1.99 dB and 1.78 dB. Isolation between the output ports was obtained as better than 28 dB.
A Novel Compact Quad-Band Microstrip Bandstop Filter Design Using Open-Circuited Stubs
(IEEE, 2013) Karpuz, Ceyhun; Gorur, Adnan; Gorur, Ali Kursad; Ozek, Ahmet
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 f(r) - 3f(r) harmonic property of the stub-loaded resonators, four stopbands at 1.15-2.22, 2.94-4.56, 4.95-6.98 and 8.26-8.96 GHz are obtained. Insertion losses of all stopbands are better than 15 dB inside the stopbands. Under the even and odd mode excitations, resonance conditions of the structure are also investigated. For the experimental verification of the simulated results, proposed filter has been fabricated. Simulated and measured results are in a good agreement.
A Novel Compact Wideband Bandstop Filter Design Using a Dual-Mode Square Loop Resonator
(IEEE, 2016) Sahin, Elif Gunturkun; Gorur, Ali Kursad; Karpuz, Ceyhun; Gorur, Adnan
In this paper, a novel compact wideband microstrip bandstop filter is presented by using a dual-mode square loop resonator having stepped impedance sections located at the lateral arms. The proposed resonator is directly connected to Input/Output (I/O) ports to obtain a wide stopband and loading elements are also employed to control the zeros and poles. The transmission-line model is used to explain the design methodology clearly. Simulated and measured responses show an excellent agreement.
A Novel Concept in Design of Microwave Planar Dual Band Filter having the Controllable Closed/Isolated Bands by Using the Simple Vias and the Slow Wave Effect for 5G/IoT Applications
(IEEE, 2021) Karpuz, Ceyhun; Ozdemir, Pinar Ozturk; Senol, Huriye; Cengiz, Alperen; Balik, Hasan Huseyin; Gorur, Adnan
A microstrip dual-mode dual-band bandpass filter with slow wave effect is presented in this paper. The slow wave effect is provided by interdigital unit cells. The interdigital unit cell located into microstrip resonator is investigated using full-wave electromagnetic simulations. It is shown that an extra surface area is not required to obtain the slow wave effect using these resonators. Using of metal vias on the resonator allows to be designing a dual-band bandpass filter configuration with out-of-band rejection characteristic. The proposed filter exhibits a wideband frequency response since the I/O ports are directly connected to the resonator. Both simulated and measured results are presented to demonstrate the proposed filter.
A novel filtering function for linear phase dual mode filters with nonequi-ripple
(IEEE, 2007) Karpuz, Ceyhun; Gorur, Adrian
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 has attractiveness because of its fast and simply applicability to exact and approximate synthesis techniques described in microwave literature and can also be used for the form with nonequi-ripple of the other filter types such as canonical filters, cross-coupled filters and source/load coupled filters. The theoretical design examples and simulated filter responses are presented for even degree filters.
A novel photonic bandgap (PBG) structure
(IEEE Computer Society, 2001) Gorur, Adnan; Karpuz, Ceyhun; Yalcin, Kursat
A novel one-dimensional (1-D) photonic bandgap (PBG) structure for microstrip lines is proposed. This new circuit is consisting of cross-gaps and base-to-base triangles etched in the ground plane of microstrip line. The PBG structures were designed and fabricated with different dimensions. It has been shown that the stopband characteristics may be controlled by tuning the geometrical dimensions. Also, multiple-frequency-tuned PBG structure has been derived by increasing the geometrical dimension. © 2001 IEEE.
An alternative application to tune the center frequency of a microstrip balun bandpass filter
(Institute of Electrical and Electronics Engineers Inc., 2019) Ozdemir, Pinar Ozturk; Ozturk, Ali; Gorur, Ali Kursad; Karpuz, Ceyhun; Gorur, Adnan
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 in different filtering characteristics are designed at same center frequencies. Those filters can also operate in a range of 1.8-2.2 GHz depending on the changes in the capacitances of varactor diodes. The proposed balun bandpass filter is carried out using the presented filters. For demonstration, the proposed circuit was fabricated and tested. Experimental results exhibit an acceptable agreement with the estimated results. © 2019 EuMCE.
An alternative coupling matrix arrangement for capacitively loaded multi-mode microstrip diplexers having close channel bands
(Elsevier Gmbh, 2023) Karpuz, Ceyhun; Ozdemir, Pinar Ozturk; Balik, Hasan Huseyin; Gorur, Adnan
In this paper, a design procedure for multi-mode diplexers having closely located bands and an alternative coupling matrix arrangement suitable for all types are reported. The proposed topology includes the interdigital capacitive fingers as a loading element. In addition, the theoretical approach is based on the combination of a polynomial synthesis procedure and the coupling matrix synthesis method. The validation is shown by the design and fabrication of new microstrip diplexers having two different dual/quad modes bandpass filters to explain how the required selectivity and the isolation between the close channels are obtained. To obtain the best performance without an extra matching circuit, the capacitively loaded loop resonators used as a channel filter are fed by a T-junction. To obtain a sufficient coupling effect a serial capacity is used in the input/output. The proposed resonator is investigated by using the even-odd mode analysis to evaluate the resonance frequencies, transmission zeros, and return loss level. An interdigital loading element not only achieves dual-mode characteristics without the requirement of any extra surface area but also moves the transmission zeros to the desired side of the passband. The proposed diplexers have advantages such as compact size, good selectivity, interconnection capability, and high isolation.
Asymmetric Dual-Mode Microstrip Filters with Adjustable Transmission Zero
(IEEE, 2007) Gorur, Adnan; Karpuz, Ceyhun; Eryilmaz, Goekhan Murat
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 the perturbation size. The two samples of asymmetric dual-mode microstrip filter were designed, fabricated and measured to demonstrate the design of dual-mode microstrip filters exhibiting transmission zero shifting property. The one of them produces a filter characteristic with two TZs in the upper stopband the other has two TZs in the lower and upper stopbands. The shifting of the one of the TZs from one side of the passband to the other is realized by only changing the perturbation size.
ASYMMETRIC DUAL-MODE MICROSTRIP SQUARE LOOP RESONATORS AND FILTERS
(IEEE, 2008) Karpuz, Ceyhun; Goeruer, Adnan; Eryilmaz, G. Murat
[Abstract Not Available]
Asymmetric Response Dual-Mode Dual-Band Bandstop Filters Having Simple and Understandable Topology
(IEEE, 2009) Karpuz, Ceyhun; Gorur, Adnan; Gunturkun, Elif; Gorur, Ali Kursad
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 using full-wave electromagnetic simulations. It is also found that there are five reflection zeros. Three of them are inherently associated with the proposed topology, whereas the other reflection zeros near stopbands are associated with the perturbation. They may be easily adjusted by changing the size of the perturbation element. Four dual-band filters using dual-mode resonators are demonstrated with different asymmetric responses, which result from different locations of adjustable reflection zeros. Both simulated and measured results are presented and exhibit dual-mode dual-band bandstop responses with high sharpness.
Compact dual-band bandpass filters using dual-mode resonators
(IEEE, 2007) Goeruer, Adnan; Karpuz, Ceyhun
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 tines are employed to suppress harmonics. The two DBBPFs with real axis and imaginary aids transmission zeros are designed, fabricated and measured.
Compact Dual-Mode Microstrip Quasi-Meander Loop Resonator for Filter Applications
(IEEE, 2008) Karpuz, Ceyhun; Eryilmaz, G. Murat; Goeruer, Adnan
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 resonator exhibit behavior similar to that of conventional dual-mode loop resonator. It is shown that there are two transmission zeros. The one of them is inherently associated with the dual-mode resonator structure and the other one is inherently associated with the odd mode. Two asymmetrical response filters exhibiting two transmission zeros in the upper stopband, and two transmission zeros in the lower and upper stopbands are realized utilizing dual-mode quasi-meander loop resonator.
Compact Half-Mode Triple-Band Bandpass Filter by using Stepped Impedance Resonators with Grounding Via Holes
(IEEE, 2023) Karpuz, Ceyhun; Ozdemir, Pinar Ozturk; Balik, Hasan Huseyin; Cengiz, Alperen; Gorur, Adnan
This letter presents a half-mode triple-band bandpass filter based on folded stepped impedance resonator stub. Also, an interdigital structure with lumped capacitance is added to the circuit to obtain a compact-size filter while maintaining the filtering characteristics. The utilization of the lumped capacitor at the middle point of the interdigital structure contributes to the shift down of the higher modes. Thus, an extra passband generates at the operating frequency range. Also, more reduced size is achieved by using a half-mode circuit.
Compact Wilkinson Power Dividers Based on Narrow Slits Loaded Transmission Lines
(IEEE Computer Society, 2023) Karpuz, Ceyhun; Gorur, Ali Kursad; Cakir, Mehmet; Cengiz, Alperen; Gorur, Adnan
In this paper, a new approach based on the utilization of narrow slits to improve the return loss and isolation levels of the Wilkinson power dividers is proposed. 2-, 4- and 8-way power dividers are designed by using narrow slits on the quarter wavelength transmission lines. The proposed circuits are designed at the center frequencies of 2, 2.1 and 2.05 GHz. The fractional bandwidths (FBWs) for the return loss of better than 15 dB and isolation levels of better than 20 dB are 19.7%, 28%, 28.2 % for 2-, 4-, and 8-way power dividers, respectively. The proposed method can also reduce the circuit size about 25 % and more in the 2-way and 4-way (8-way) circuits, respectively. Three circuits have been fabricated and measured in a very good agreement with the simulated results. © 2023 IEEE.
Cross-coupled bandpass filter using microstrip triangular open-loop resonators
(IEEE Computer Society, 2001) Gorur, Adnan; Karpuz, Ceyhun
A new cross-coupled planar microwave filter is proposed using coupled microstrip triangular open-loop resonators. The full-wave EM simulator is used to design the triangular resonator and to calculate the coupling coefficients of three basic coupling structures encountered in this type of filter. A four-pole elliptic function filter of this type is designed and fabricated. Measured filter performance is compared with the simulated performance. © 2001 IEEE.
Design of a compact microstrip quadruplexer with closely spaced switchable and tunable channels based on asymmetrical dual-mode loop resonators
(Elsevier Gmbh, 2020) Gorur, Ali Kursad; Turkeli, Alper; Karpuz, Ceyhun; Gorur, Adnan
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 needed for switching process. In order to achieve the switching ability, varactor diodes are employed to provide variable capacitances at each resonator. Thus, all channels can be independently switched on/off by changing the capacitances of the varactor diodes. Moreover, all channels have fine bandwidth tuning mechanism depending on the capacitance changes. The designed quadruplexer was fabricated and the measurements were observed in a good agreement with the predicted results. Center frequencies of the proposed quadruplexer are adjusted to 1.8, 2.1, 2.4, and 2.7 GHz with the frequency ratios between the adjacent channels of 1.17, 1.14, and 1.13. Isolations between the outputs have been observed as better than 28 dB.

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