A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems

Nasri, Marzieh; Zarifi, Davoud; Zaman, Ashtaf Uz

doi:10.1109/access.2020.2968609

Cited by 10 publications

(4 citation statements)

References 18 publications

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“…Figure 1 shows the geometry of the periodic pins and a groove gap waveguide (GGW) structure and dimensions, as well as the simulated dispersion diagram of the periodic pin structure. To realize the PMC surface, a periodic texture of metallic pins [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ] or holes [ 29 , 30 ] can be used, and by placing a metallic plate on its top, the bandgap is achieved. The periodic pin structures are more compact and have a broader bandwidth compared to the holey structures.…”

Section: Wr-62 To Groove Gap Waveguide Transitionmentioning

confidence: 99%

“…Therefore, the fabrication of these structures is affordable and cost-effective, particularly at high-frequency ranges. Accordingly, many millimeter-wave devices and applications are presented based on gap waveguide technology, such as planar array antennas [ 15 , 16 , 17 , 18 ], filters [ 19 , 20 , 21 ], amplifiers [ 22 ], couplers [ 23 , 24 , 25 ], phase shifters [ 26 ], and rotary joints [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

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A 12–20 GHz Wideband High-Power SP2T Switch Based on Gap Waveguide Technology

Alazemi

Farahbakhsh

Zarifi

2021

Sensors

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A novel wideband high-power single-pole two-throw (SP2T) switch based on gap waveguide technology is presented in this article. The proposed switch has a SP2T structure and consists of three standard WR62 waveguide ports. Due to the advantage of gap waveguide technology, the switch design structure requires no electrical contact between its different parts, and the leakage of the electromagnetic wave is suppressed. The proposed switch has an air gap between its parts. As a result, the sliding part of the switch can be moved freely to change the switch states. Consequently, a low-precision and low-cost fabrication can be utilized. The simulation and measurement of the proposed switch indicate that a 50% operating frequency bandwidth covering the range of 12-20 GHz can be achieved. The switch input return-loss is better than 15 dB within the frequency bandwidth, whereas the insertion loss and isolation levels of the proposed design are above 0.15 dB and better than 65 dB, respectively.

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Section: Wr-62 To Groove Gap Waveguide Transitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A 12–20 GHz Wideband High-Power SP2T Switch Based on Gap Waveguide Technology

Alazemi

Farahbakhsh

Zarifi

2021

Sensors

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“…There is a clear need to develop GWT that not only maintains the advantages of other technologies but also addresses the above mentioned fabrication and assembly challenges, especially at millimetre-wave frequency range. According to the review of literature, GWT has been used to design a wide range of microwave and highfrequency components, such as planar array antenna [18][19][20][21][22], filter [23][24][25][26], coupler [27][28][29][30], phase shifter [31,32] and switch [33,34].…”

Section: Introductionmentioning

confidence: 99%

Design and development of broadband gap waveguide‐based 0‐dB couplers for Ka‐band applications

Zarifi

Farahbakhsh

Zaman

2022

IET Microwaves Antenna & Prop

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The design and fabrication of a wideband millimetre‐wave 0‐dB coupler is proposed in this paper using gap waveguide technology for low‐loss and high‐power applications in 30‐GHz frequency band. To overcome the fabrication challenges in millimetre‐wave frequencies, the gap waveguide technique is utilised. Two gap waveguide‐based coaxial‐ and waveguide‐fed 0‐dB couplers are designed with broadband performance, high return loss, acceptable coupling flatness and high isolation. For verifying the performance of the proposed structures, a prototype of the waveguide‐fed 0‐dB coupler is manufactured and measured. The measurement results show that the return and insertion losses and the isolation of the fabricated 0‐dB coupler is better than 18 dB, 0.5 and 18 dB, respectively, in the specified frequency range from 26.2 to 34 GHz. Moreover, the breakdown power level of the proposed millimetre‐wave structures is in kW orders to satisfy the high‐power requirements.

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“…To reduce the sensitivity to fabrication error and to simplify the CNC machining process, gap waveguide (GW) technology has been introduced and developed. The operating principle, fabrication, and applications of GW components have been explored in various studies [13][14][15][16][17]. GW-based antennas can be fabricated into different layers and then assembled without the need for high precision welding, which significantly reduces the implementation cost [18].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Printed, Dual-Band, Dual-Circularly Polarized Antenna Array Using Gap Waveguide Technology

Cao

et al. 2022

Applied Sciences

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A gap waveguide (GW)-based 4 × 4 dual-band, dual-circularly polarized antenna array is proposed. The antenna is composed of two stacked layers which are responsible for right-handed circularly polarized (RHCP) radiation in K-band and left-handed circularly polarized (LHCP) radiation in Ka-band. Each stacked layer consists of a GW power distribution network to excite 16 radiating units from a single input. A waffle grid is mounted on top of the array structure to increase effective aperture areas and reduce grating lobes. A prototype was fabricated using stereo lithography appearance (SLA) 3D printing and metallization technology, which significantly decreased the fabrication cost and complexity. Measurement results for the antenna prototype demonstrate the operating bandwidths of 19.91–20.52 GHz in K-band and 28.26–29.19 GHz in Ka-band, over which the reflection coefficients of <−10 dB and axial ratios of <3 dB are achieved. The prototype provides peak gains of 20.1 and 20.3 dB with total efficiencies of >90% in the two respective bands. The combination of dual-band, dual-circularly polarized capability, high gain, high efficiency, lightweight, low cost and compact size renders the proposed design a potential candidate for commercial millimeter wave communication applications.

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A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems

Cited by 10 publications

References 18 publications

A 12–20 GHz Wideband High-Power SP2T Switch Based on Gap Waveguide Technology

A 12–20 GHz Wideband High-Power SP2T Switch Based on Gap Waveguide Technology

Design and development of broadband gap waveguide‐based 0‐dB couplers for Ka‐band applications

Three-Dimensional Printed, Dual-Band, Dual-Circularly Polarized Antenna Array Using Gap Waveguide Technology

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