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A dual-mode uniplanar bandpass filter using an inset-coupling structure
(JOHN WILEY & SONS INC, 2004) Gorur, A; Caliskan, S; Karpuz, C
novel dual-mode uniplanor square slot-loop resonator, using air 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 uniplanor filter using such a resonator is designed and fabricated with 5% bandwidth at the center frequencey of 2.97 GHz for demonstration. The measured filter performance is presented. (C) 2004 Wiley Periodicals, Inc.
A novel double-frequency-tuned photonic bandgap (PBG) structure
(IEEE, 2001) Gorur, A; Karpuz, C; Gorur, H; Yalcin, K
A novel one-dimensional (1-D) photonic bandgap (PBG) structure for microstrip lines is proposed in this study. The PBG structures are designed and fabricated with different configurations, but the same period. It is shown that the stopband characteristics may be controlled by the geometrical configuration. Also, double-frequency-tuned PBG structure is derived by changing the geometrical configuration and the dimension of a conductor strip in geometrical structure.
A reduced-size dual-mode bandpass filter with capacitively loaded open-loop arms
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003) Gorur, A; Karpuz, C; Akpinar, M
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 filters. It is shown that the proposed filter has a size reduction of about 59% at the same center frequency, as compared with the dual-mode bandpass filters such as microstrip patch, cross-slotted patch, square loop and ring resonator filter.
A study on resonance characteristics of a microstrip open-loop resonator
(JOHN WILEY & SONS INC, 2001) Gorur, A; Karpuz, C; Yilmaz, A; Yalcin, K
A microstrip open-loop resonator (MOLR) is proposed for maximum miniaturization in microwave applications, and to obtain a wider upper stopband including the first spurious resonance frequency for planar bandpass filters. The effect of variation in the width of one of the longer strips of an OLR formed in two ways (namely, fired-gap (FG) and variable-gap (VG) OLR) on their resonance characteristics is discussed. Also, simple empirical expressions indicating the effect of variation in the strip width are derived for estimation of the resonance frequency as a function of the variable strip width and the fundamental resonance frequency of the standard loop resonator. (C) 2001 John Wiley & Sons, Inc.
An investigation on resonance characteristics of CPS open-loop resonator
(IEEE, 2001) Karpuz, C; Gorur, H; Yalcin, K; Gorur, A
A novel coplanar stripline (CPS) open-loop resonator (OLR) is proposed for maximum miniaturization in uniplanar microwave applications. The effect of variation in the one's width of longer strips of OLR formed in two ways (namely, CPS fixed gap (FG) and CPS variable gap (VG) OLR) on their resonance characteristics is discussed. It is also shown that (VG) OLR structure supports a wider upper stopband including the first spurious resonance frequency.
Analysis of a cylindrical coupling structure
(JOHN WILEY & SONS INC, 1999) Gorur, A; Duyar, M; Karpuz, C
Coupled lines perpendicular to their cylindrical ground plane embedded in a cylindrical structure are proposed and analyzed CAD-oriented analytic formulas for investigating the quasistatic mode parameters and the coupling properties are derived with the even-odd mode analysis method based on the quasi-TEM approximation. Calculated mode impedances and coupling coefficients are observed to be sensitive to cylindrical curvature, especially for larger values of the spacing in the ground plane. Calculated results are compared,vith those obtained for a corresponding planar coupling structure. (C) 1999 John Wiley & Sons, Inc.
Analysis of broadside-coupled asymmetric coplanar waveguide with one lateral ground plane
(JOHN WILEY & SONS INC, 2000) Gorur, A; Karpuz, C
CAD-oriented analytic formulas for. calculating the quasistatic TEM parameters of a broadside-coupled open and dielectric-overlayed asymmetric coplanar waveguide (BC ACPW) with one lateral ground plane are obtained using the conformal mapping method (CMM) which can provide accurate and fast calculations, The effect of the dielectric overlays on the mode velocity ratio and coupling coefficient are presented and discussed. The accuracy of the closed-form expressions has been confirmed by comparison with results available in the literature for broadside-coupled dielectric-overlayed CPW and broadside-coupled micro CPW. (C) 2000 John Wiley & Sons, Inc.
Analysis of coplanar-coupled lines on a cylindrical substrate
(JOHN WILEY & SONS INC, 2000) Karpuz, C; Duyar, M; Gorur, A
CAD-oriented closed-form expressions are presented for calculating the quasistatic TEM parameters of coplanar-coupled lines on a cylindrical substrate. The effect of the curvature on the quasistatic parameters is discussed by using the formulas derived by the conformal mapping techniques. Comparisons have also been made between the present results and the results available in the literature for coplanar-coupled lines on a planar substrate. The results of this paper are in very good agreement with the results derived by the conformal mapping technique and the spectral-domain method for the planar one. (C) 2000 John Wiley & Sons, Inc.
Analysis of coupled coplanar waveguides with V-shaped conductor backing using conformal-mapping method
(IEE-INST ELEC ENG, 2000) Gorur, A; Karpuz, C; Duyar, M
The V-shaped microshield coupled parallel coplanar waveguides. a new type of the coupled parallel coplanar waveguide (CP CPW). is proposed. Closed-form expressions are presented for calculating the quasistatic parameters of this coupled structure bq using conformal-mapping techniques. The effect of the V-shaped conductor backing on the coupling between CPWs is also discussed. Comparisons are made between the present numerical results and the spectral-domain method results available in the literature for a conventional CP CPW. In addition, the coupling coefficient of the present coupled CPW is shown to be significantly lower than that of a coupled parallel CPW.
Analysis of cylindrical conductor-backed coplanar waveguides
(JOHN WILEY & SONS INC, 2000) Karpuz, C; Duyar, M; Gorur, A
CAD-oriented closed-form expressions are presented for calculating the quasistatic parameters of a conductor-backed coplanar waveguide (CBCPW) on a cylindrical substrate. The effect of the curvature on the quasistatic parameters is also discussed by using the formulas derived by the conformal mapping techniques. Furthermore, comparisons are made between the present results and the results available in the literature for CBCPW on a planar substrate and microstrip on a cylindrical substrate. (C) 2000 John Wiley & Sons, Inc.
Analysis of line to line coupled coplanar waveguides with W-shaped conductor backing using conformal mapping method
(JOHN WILEY & SONS INC, 2002) Tezekici, BS; Karpuz, C; Gorur, H; Gorur, A
A W-shaped microshield coupled parallel coplanar waveguide (CP CPW), which is a new type of CP CPW, is proposed. Closed-form expressions are presented for calculating the quasistatic parameters of this coupled structure by using conformal mapping techniques. The effect of the W-shaped conductor backing on the coupling between CPWs is also discussed. Comparisons are made between the present numerical results and the results available in the microwave literature for CPW V-shaped microshield coupled lines (CWVMCLs) and CP CPWs with a flat conductor backing. In addition, the coupling coefficient of the coupled CPWs is shown to be significantly lower than that of the CWVMCLs in the literature. (C) 2002 Wiley Periodicals. Inc.
Analytic formulas for calculating the quasistatic parameters of a multilayer cylindrical coplanar strip line
(JOHN WILEY & SONS INC, 1999) Gorur, A; Duyar, M; Karpuz, C
Fast, simple and accurate analytic expressions are derived for calculating the quasistatic TEM parameters of a multilayer cylindrical coplanar strip line (MC CPS). The effects of the dielectric materials on the quasi-TEM characteristics are investigated using the conformal mapping method The derived results are compared with those of a corresponding planar CPS. The curvature effects on the quasistatic parameters are also discussed. In addition, it has been observed that the effect of the inner substrate on the quasistatic parameters is much less than the outer substrate. (C) 1999 John Wiley & Sons, Inc.
Analytic formulas for conductor-backed asymmetric CPW with one lateral ground plane
(JOHN WILEY & SONS INC, 1999) Gorur, A; Karpuz, C
Closed-form analytical expressions suitable for CAD software packages are presented for calculating the quasistatic TEM parameters of a conductor-backed asymmetric coplanar waveguide (CB ACPW) with one lateral ground plane. The effect of the removal of one of the lateral ground planes of the conventional ACPW and additional backed ground plane on the quasistatic parameters is discussed by using the expressions derived by the conformal mapping techniques. This paper's results are compared with the results available in the literature. (C) 1999 John Wiley & Sons, Inc.
Bandstop characteristics of a triangular microstrip slotted patch as an electromagnetic bandgap(EBG)
(JOHN WILEY & SONS INC, 2003) Karpuz, C
A novel electromagnetic bandgap (EBG) circuit with a single cell, using a microstrip isosceles triangular patch inserted to the microstrip line, with wideband tuning capability is successfully demonstrated. Both measured and simulated results confirm that the stopband characteristics can easily be controlled by the slot dimensions. Moreover, the proposed EBG structure is simple and compact for MMIC applications. (C) 2003 Wiley Periodicals, Inc.
Bandstop characteristics of microstrip slotted patch without periodic elements
(JOHN WILEY & SONS INC, 2002) Gorur, A; Karpuz, C; Tezekici, BS; Gorur, H
A rectangular microstrip slotted patch, which provides the bandgap with different manner of a PBG, is successfully demonstrated with the wideband tuning capability. Both experimental and simulated results confirm that the stopband characteristics can easily be controlled by the slot dimensions, especially by the slot length and the slot position. Moreover, the proposed structure is the simple and compact for MMIC applications. (C) 2002 Wiley Periodicals, Inc.
Bandstop filter with a wider upper passband using microstrip open-loop resonator
(IEEE, 2001) Gorur, A; Karpuz, C; Yalcin, K; Gorur, H
We propose a bandstop filter with a wider upper passband using microstrip open-loop resonators for modern communication systems. A microstrip open-loop resonator (MOLR) is discussed for maximum miniaturization in microwave applications and to obtain a wider upper stopband (or passband) including the first spurious resonance frequency for planar filters. The bandstop filter is designed and fabricated using a full-wave simulator. The measured filter performance shows a good agreement with the simulated response.
Characteristics of periodically loaded CPW structures
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998) Gorur, A; Karpuz, C; Alkan, M
A capacitively loaded coplanar waveguide (CPW) resonator has been studied. It has been shown that the proposed resonator can be used to achieve a slow-wave effect without occupying extra surface area and it has a good performance as compared with the conventional half-wavelength CPW resonator, Furthermore, dispersive effects have been increased with the number of slots in periodically loaded structures.
Comments on "CAD models for asymmetrical, elliptical, cylindrical, and elliptical cone coplanar strip lines"
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001) Gorur, A; Karpuz, C
[Abstract Not Available]
Compact dual-mode microstrip resonator for 900 MHz bandpass filter applications
(JOHN WILEY & SONS INC, 2005) Helvaci, AK; Karpuz, C; Gorur, A
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 measurement. (c) 2005 Wiley Periodicals, Inc.
Effect of finite and different ground-plane widths on quasistatic parameters of asymmetrical coplanar waveguides
(JOHN WILEY & SONS INC, 2000) Gorur, A; Karpuz, C
Fast, accurate, and simple closed-form expressions are presented for calculating the quasistatic TEM parameters of asymmetrical coplanar waveguides (ACPWs) with finite and different ground planes. The effect of the ground-plane width and the asymmetry in the ground-plane widths and in the spacings of ACPWs on the line parameters is investigated by using the formulas derived by conformal mapping techniques. Comparisons are also made between the present results and the results available in the literature for both the conventional coplanar waveguide (CPW) and the ACPW. The results in this article are in very good agreement with the results derived by the conformal mapping technique, by the variational formulation, and by the spectral-domain method. It has been shown that the asymmetry of both ground planes and spacings leads to a significant change of the quasi-TEM parameters with respect to cases of the finite and infinite ground planes. (C) 2000 John Wiley & Sons, Inc.

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