Considerations of impedance sensitivity and losses in designing inverted microstrip gap waveguides

Pizarro, Francisco; Sanchez-Cabello, Carlos; Vazquez-Roy, Jose Luis; Rajo‐Iglesias, Eva

doi:10.1016/j.aeue.2020.153353

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…This feature simplifies the fabrication process and reduces the complexity and cost of the device. The MB-RGW filter has the potential to be employed in a variety of applications, including radar systems, wireless communication, satellite communication, and other microwave and millimeter-wave applications [3,17,22].…”

Section: Unit Cell Designmentioning

confidence: 99%

Highly-selective Ridge Gap Waveguide Based Filters for Multi-band Satellite Applications

Chhasatia¹,

Chaudhari²,

Patel³

2023

PIER M

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In this paper, a pioneering and innovative approach for multiple-band ridge gap waveguide (MB-RGW) based narrowband bandpass filter for satellite applications is presented. The MB-RGW represents a significant and emerging technological advancement within the domain of microwave and millimeter-wave engineering. It comprises a periodic structure that enables the propagation of electromagnetic waves along its axis. We have provided a detailed analysis of the MB-RGW, which includes its design, simulation, and experimental results. A prototype filter, designed according to specifications, was successfully produced with a fabricated circuit area measuring 42.25 mm×76.25 mm× 8.8 mm. We demonstrate that the MB-RGW can achieve multiple bands with a single structure, making it a versatile and efficient device for a wide range of applications. We also present a detailed analysis of the factors that affect the performance of the MB-RGW, including the geometry of the ridge and the spacing between ridges. Our experimental results show that the MB-RGW can achieve high levels of attenuation and isolation, making it a promising candidate for the use in microwave and millimeterwave circuits and systems. The experimental results show S 11 smaller than −20 dB over relative bandwidths, and S 21 has a maximum of −0.07 dB. The proposed filter demonstrates four resonances at frequencies of 10.6 GHz, 12.6 GHz, 14.7 GHz, and 17.1 GHz, catering to mobile and fixed radio locations as well as satellite applications. It exhibits a fractional bandwidth of 0.44% at 3 dB in the X-Band and approximately 0.57% to 0.61% at 3 dB bandwidth in the Ku-band. The filter offers a compact, cost-effective, and easily implementable solution for satellite communication systems, including space operations, earth exploration, satellite TV broadcasting, and fixed satellite services (FSS). Overall, this paper provides a comprehensive overview of the MB-RGW and its potential for the use in a range of applications.

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Section: Unit Cell Designmentioning

confidence: 99%

Highly-selective Ridge Gap Waveguide Based Filters for Multi-band Satellite Applications

Chhasatia¹,

Chaudhari²,

Patel³

2023

PIER M

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“…These tolerances were carefully studied in [11], where the sensitivity of the inverted microstrip gap waveguide line impedance to its position on the rows of pins is studied in depth. For that reason we decided to follow the work presented in [36] where an End-Coupled Band Pass Filter (BPF) was selected.…”

Section: Diplexer Designmentioning

confidence: 99%

“…There are many examples of designs of antennas and circuits made in gap waveguide technology in the literature, but not that many in the case of the inverted microstrip version. Some examples can be found in [5][6][7][8][9][10][11]; also transitions to standard waveguides and transmission lines have been developped [12][13][14][15][16], the study of the optimal numeric port [17]; up to some of the various components that make up a RF front-end like antenna feeds [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]; beamforming Butler matrix [33,34] or filters [5,[35][36][37][38][39]. Few studies on diplexers with this technology have been published apart from this one using the groove version [40].…”

Section: Introductionmentioning

confidence: 99%

Ka-Band Diplexer for 5G mmWave Applications in Inverted Microstrip Gap Waveguide Technology

2020

Self Cite

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A new cost-efficient, low-loss Ka-band diplexer designed in inverted microstrip gap waveguide technology is presented in this paper. Gap waveguide allows to propagate quasi-TEM modes in the air between two metal plates without the need for contact between them by using periodic metasurfaces. The diplexer is realized by using a bed of nails as AMC (Artificial Magnetic Conductor), first modeled with a PMC (Perfect Magnetic Conductor) surface for design simplification, and two fifth order end-coupled passband filters (BPFs) along with a power divider. The experimental verification confirms that the two channels centered at 24 GHz and 28 GHz with 1 GHz of bandwidth show measured insertion losses of 1.5 dB and 2 dB and 60 dB of isolation between them. A slight shift in frequency is observed in the measurements that can be easily explained by the variation in the permittivity of the substrate.

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“…Based on the GW concept, a groove gap waveguide (GGW) was proposed in [22]. Recently, inverted microstrip and coplanar gap waveguides based on this idea were also presented [23][24][25]. However, the dielectric thickness in these new transmission lines negatively affects the losses with respect to the GGW.…”

Section: Introductionmentioning

confidence: 99%

Compact Wideband Groove Gap Waveguide Bandpass Filters Manufactured with 3D Printing and CNC Milling Techniques

Máximo-Gutierrez,

Hinojosa,

Abad-López

et al. 2023

Sensors

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This paper presents for the first time a compact wideband bandpass filter in groove gap waveguide (GGW) technology. The structure is obtained by including metallic pins along the central part of the GGW bottom plate according to an n-order Chebyshev stepped impedance synthesis method. The bandpass response is achieved by combining the high-pass characteristic of the GGW and the low-pass behavior of the metallic pins, which act as impedance inverters. This simple structure together with the rigorous design technique allows for a reduction in the manufacturing complexity for the realization of high-performance filters. These capabilities are verified by designing a fifth-order GGW Chebyshev bandpass filter with a bandwidth BW = 3.7 GHz and return loss RL = 20 dB in the frequency range of the WR-75 standard, and by implementing it using computer numerical control (CNC) machining and three-dimensional (3D) printing techniques. Three prototypes have been manufactured: one using a computer numerical control (CNC) milling machine and two others by means of a stereolithography-based 3D printer and a photopolymer resin. One of the two resin-based prototypes has been metallized from a silver vacuum thermal evaporation deposition technique, while for the other a spray coating system has been used. The three prototypes have shown a good agreement between the measured and simulated S-parameters, with insertion losses better than IL = 1.2 dB. Reduced size and high-performance frequency responses with respect to other GGW bandpass filters were obtained. These wideband GGW filter prototypes could have a great potential for future emerging satellite communications systems.

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Considerations of impedance sensitivity and losses in designing inverted microstrip gap waveguides

Cited by 10 publications

References 20 publications

Highly-selective Ridge Gap Waveguide Based Filters for Multi-band Satellite Applications

Highly-selective Ridge Gap Waveguide Based Filters for Multi-band Satellite Applications

Ka-Band Diplexer for 5G mmWave Applications in Inverted Microstrip Gap Waveguide Technology

Compact Wideband Groove Gap Waveguide Bandpass Filters Manufactured with 3D Printing and CNC Milling Techniques

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