Novel Implementation of Transversal Filters in Multilayered Microstrip Technology

Rebenaque, David Cañete; García, Juan Pascual; Gómez‐Tornero, José Luis; Melcón, Alejandro Álvarez; Pereira, Fernando Daniel Quesada

doi:10.1163/156939310791586179

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…They have been widely used in microwave filters due to their small size, planner structure and narrow realizable bandwidth. Although these resonators or other modified versions of them such as hexagonal [2][3][4] and spiral resonators [5,6] have been used to realize canonical [7][8][9][10][11][12][13], dual [14][15][16][17][18][19][20][21], triple [22,23] and quadpassband filters [24] with complicated transmission characteristics, all of these filters suffer from the time consuming full-wave-based process of determining the physical parameters of the filter from the desired coupling factor and Q ext . The ability of soft computing techniques in modeling complicated problems in a vanishingly short time instead of using numerical or analytical approach [25][26][27][28][29][30][31][32] may provide a fast and accurate solution to this problem.…”

Section: Introductionmentioning

confidence: 99%

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Rezaee¹,

Tayarani²,

Knöchel³

2011

PIER

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Abstract-In the final step of any filter design process, the desired center frequency, coupling factor and external quality factor (Q ext ) are used to determine the physical parameters of the filter. Although in the most cases the physical dimensions of a single resonator for a given center frequency are determined using exact analytical or simple approximate equations, usually such simple equations cannot be found to easily relate the required coupling factor and Q ext to the physical parameters of the filter. Analytical calculation of coupling factor and Q ext versus dimensions are usually complicated due to the geometrical complexities or in some cases such as microstrip resonators due to the lack of exact solution for the field distribution. Therefore coupling factor and Q ext of various kinds of resonators, especially microstrip resonators, are related to the physical parameters of the structure by the use of time consuming full wave simulations. In this paper a surprisingly fast and completely general approach based on a soft computing pattern-based processing technique, called active learning method (ALM) is proposed to overcome the time consuming process of coupling factor and Q ext determination. At first the ALM technique and the steps of modeling are generally described, then as an example and in order to show the ability of the method this modeling approach is implemented to model the coupling factor and Q ext surfaces of microstrip open-loop resonators versus physical parameters of the structure. Using the ALM-based extracted surfaces for coupling factor and Q ext , two four pole Chebychev bandpass filters are designed and fabricated. Good agreement between the measured and simulated results validates the accuracy of the proposed approach.

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Section: Introductionmentioning

confidence: 99%

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Rezaee¹,

Tayarani²,

Knöchel³

2011

PIER

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“…The designs presented in this paper use a suspended resonator into a multilayer structure; allowing different coupling arrangements to produce electric, magnetic and mixed couplings, enabling quasi-elliptic function approximation or flat group delay responses, without using extra coupling probes, extra cavities or folded structures. The multilayer structure can provide a wide range of couplings, an easy introduction of cross couplings and size reduction [9][10][11][12]. The proposed resonator is a quarter wavelength long suspended by stubs, suitable for the design of narrowband filters using coaxial lines.…”

Section: Introductionmentioning

confidence: 99%

Coaxial Narrowband Filters Using a Versatile Suspended Resonator

Jaimes-Vera¹,

Llamas-Garro²,

Corona‐Chávez³

2011

PIER

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Abstract-In this paper, two four-pole filters at X-band are presented, both designs use a coaxial quarter wavelength resonator suspended in air by short circuits between the coaxial center and outer conductor. Different couplings between suspended resonators have been used to obtain a Chebyshev and a quasi-elliptic response. The Chebyshev filter was designed to have a 9.2 GHz centre frequency with a 4% fractional bandwidth. The second design is a quasi-elliptic filter composed of two vertically stacked rectangular coaxial lines, where one pair of resonators is placed on the lower coaxial line and another pair is located on the upper line. Coupling between coaxial lines is achieved through an iris in the common coaxial ground plane. The quasi-elliptic filter has been designed to have a centre frequency of 9.1 GHz with a 4% fractional bandwidth. Two transmission zeros located at the sides of the passband have been successfully achieved with the proposed filter topology. Experimental results for both designs are presented, where a good agreement with simulations has been obtained.

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“…Therefore high-frequency effects in the guiding systems (commonly dispersion and power loss in microstrip lines and/or coplanar waveguides) are becoming a serious concern [1]. Also, microstrip technology is currently employed in a wide range of applications [2][3][4][5][6][7][8]. High-frequency effects in microstrip and stripline structures are often associated with the spurious excitation of a leaky mode (LM) as well as other constitutive components of the continuous spectrum (CS) [9][10][11][12]; although the excitation of leaky modes can also be advantageously used for the design of antennas [13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Low-Frequency Excitation of Leaky Modes in a Microstrip Line With a Top Cover

Mesa

Méndez²,

Jackson³

2011

PIER

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Abstract-This paper studies the excitation of a physical leaky mode in a covered microstrip structure at low frequencies. We calculate the current excited in the line by a delta-gap voltage source via a full wave analysis based on a mixed potential integral equation scheme. The current in the line is decomposed into its bound mode and continuous spectrum components. The bound mode component is associated with the propagation effects whereas the continuous spectrum component is associated with reactive and/or radiative effects and contains the contribution of the leaky mode. Our analysis also includes a detail study of the dispersion relations of the bound and leaky modes along with their corresponding electric fields. At low frequencies, in the covered microstrip structure with a low top cover height, we have found that the bound mode role is superseded by the leaky mode, in the sense that it is the leaky mode which partially or totally carries the signal energy. Therefore, the spurious effects associated with the excitation of a leaky mode, which usually appear at high frequencies in open 236Bernal, Mesa, and Jackson microstrip lines, appear here in the low frequency range. This effect may have very relevant practical consequences in the performance of such systems.

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Novel Implementation of Transversal Filters in Multilayered Microstrip Technology

Cited by 3 publications

References 15 publications

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Coaxial Narrowband Filters Using a Versatile Suspended Resonator

Low-Frequency Excitation of Leaky Modes in a Microstrip Line With a Top Cover

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