Coupling modeling and reduction techniques of cavity-backed slot antennas: FDTD versus measurements

Georgakopoulos, Stavros V.; Birtcher, Craig R.; Balanis, C.A.

doi:10.1109/15.942599

Cited by 21 publications

(7 citation statements)

References 23 publications

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“…Figure 4 shows the input impedance of the CBS antenna which is computed using a diffrentiated Gaussian pulse with an internal source resistance of 50 Ω to reduce the computational time required for the monopole current pulse to vanish. The frequency response of the antenna input impedance is compared with that obtained in [6]. The comparison shows good agreement which ensures the validity of the applied FDTD algorithm and the C++ program developed by the authors.…”

Section: Characteristics Of a Single Cbs Antennamentioning

confidence: 86%

“…The results obtained for the input impedance against the frequency are compared to those presented in [6]. The dependence of the gain of a single CBS antenna on the location of the exciting monopole is investigated at different frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…To verify the validity of the numerical results for the CBS antenna obtained by the applied FDTD algorithm, they are compared with those obtained in [6] for the same antenna. The results obtained for the input impedance against the frequency are compared to those presented in [6].…”

Section: Resultsmentioning

confidence: 99%

“…The CBS antenna is constructed as an open ended rectangular waveguide which is mounted at the center of a rectangular conducting plate with an aperture that coincides with the open end of the waveguide. The dimensions of the conducting plate, W x × W y , do not have a profound effect on the value of the input impedance as long as they are large enough [6]. The CBS antenna is fed by a monopole located inside the cavity at (a/2, b, c) with its base attached to one of the waveguide walls as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…CBS scatterers and antennas are famous for theri internal resonance [14][15][16][17][18][19][20][21][22][23] and have been analyzed using various methods such as the integral equation solution by the method of moments (MOM) [1,2], finite element method (FEM) [3] and finite-difference time-domain (FDTD) method [4][5][6]. In this paper, the analysis of the CBS antenna is performed using FDTD method [11,12] because of its ability to model complex structures especially when they are made of planar surfaces or piecewise rectangular blocks.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Circularly Polarized Arrays of Cavity Backed Slot Antennas for X-Band Satellite Communications

Eldesouki¹,

Hussein²,

El-Nadi³

2008

PIER B

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Abstract-Circularly-polarized arrays of cavity backed slot (CBS) antennas are proposed for X-band satellite-earth communications. Two configurations of such circularly polarized arrays are investigated: cross-shaped and square-shaped arrays. Both configurations can produce right-hand circular polarization (RHCP) as well as lefthand circular polarization (LHCP) by proper setting of excitation phase for each element in the array. The finite-difference timedomain (FDTD) method is used to analyze the characteristics of the proposed arrays including the input impedance, S-parameters, radiation pattern, gain and axial ratio. The results show that the proposed array configurations seem very promising and useful for geostationary satellite applications.

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Section: Characteristics Of a Single Cbs Antennamentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Circularly Polarized Arrays of Cavity Backed Slot Antennas for X-Band Satellite Communications

Eldesouki¹,

Hussein²,

El-Nadi³

2008

PIER B

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Defected Ground Structures for Microwave Applications

Bhuiyan

Karmakar

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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Improved performances, compact size, and lower cost are the key driving factors for advancement of modern communication systems. To meet these stringent requirements, defected ground structures (DGS) can be an effective tool. In this article, a comprehensive review of various DGS configurations emphasizing the background and evolution, classification, equivalent circuit modeling techniques, and their applications in different areas of microwave engineering has been presented. A review of different DGS‐engineered band stop filters (BSFs), low‐pass filters (LPFs), and high‐performance band‐pass filters (BPFs) is included. An overview of the applications of DGS in performance improvements of microwave antennas in terms of impedance matching, size reduction, spurious response suppression, mutual coupling reduction, cross‐polarized radiation suppression, and application of DGS in accomplishing a beam‐steering operation for a phased array antenna has also been included. Radio frequency identification (RFID) and microwave sensors, which are finding increased application, are introduced, and applications of DGS in conventional and chipless RFID tag design as well as in low‐cost passive microwave sensor implementation are also discussed. Additionally, applications of DGS in high‐impedance microstrip line realization and in output power and operational efficiency enhancement of microwave active circuits like oscillators and power amplifiers are covered. Finally, some limitations and challenges of DGS implementation in microwave circuits and antennas are discussed. Overall, adaptation of DGS in conventional passive and active microwave applications and in new emerging fields, like RFID and sensors, are covered in this article.

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Coupling reduction between groove‐backed antennas

Yang

Eom

Jung

2003

Micro & Optical Tech Letters

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generated concentrating near the third harmonic of the original pulse.According to the numerical calculations of the system of Eq. (15), when phase synchronicity does not occur over the whole pulse spectrum, an extraordinary wave optical videopulse arises in the crystal, and in its spectrum the sum and difference frequency regions are clearly defined. Two maxima of the frequency spectrum are centered at 2 ⅐ 0 and 3 ⅐ 0 . The widths of the maxima are determined by the phase matching condition for different spectral components of the pump pulse. The maximum in the difference frequencies region is at zero frequency. A constant component of the field is also noticeable on the time profile of extraordinary polarized pulse, the broad spectrum of which is determined by the duration of the pump pulse. CONCLUSIONIn this paper we derived a system of nonlinear wave equations (Eq. (15)) that describes the propagation of a femtosecond laser pulse of a few optical oscillations in a negative uniaxial crystal in the direction normal to the optical axis, taking into account both second-and third-order nonlinearity. In particular, we looked at the case where phase synchronicity did not apply for the whole pulse spectrum.In the linear part of the medium polarization, we expanded the nonlinear equations around a small parameter equal to the ratio of the medium response time to the average oscillation period of a femtosecond pulse. This expansion was used for the description of a uniaxial crystal's linear response to laser radiation of a few optical oscillations in the near infrared spectrum range. In the nonlinear part of the polarization of a 3-m group uniaxial crystal, which is responsible for second-and third-order nonlinearity, we confined ourselves to the quasi-static approximation for the near infrared spectral range and for small thickness of nonlinear crystal.From the numerical simulation of Eq. (15) we found that including third-order nonlinearity effects yields spectral components of an extraordinary polarization concentrated in the third harmonic of the original pulse.Lastly, we obtain the radiation-conversion ratio ␥ ϳ (S z ()/ S x0 ()) 2 as a function of both femtosecond pulse duration and intensity, and on crystal length at frequencies near the second harmonic of the original pulse 2 ⅐ 0 . ACKNOWLEDGMENTS

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Coupling modeling and reduction techniques of cavity-backed slot antennas: FDTD versus measurements

Cited by 21 publications

References 23 publications

Circularly Polarized Arrays of Cavity Backed Slot Antennas for X-Band Satellite Communications

Circularly Polarized Arrays of Cavity Backed Slot Antennas for X-Band Satellite Communications

Defected Ground Structures for Microwave Applications

Coupling reduction between groove‐backed antennas

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