| 1. |
- Hamedani, Mahsa, et al.
(författare)
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Planar H-Plane Horn Antenna Based on Groove Gap Waveguide Technology
- 2020
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Ingår i: IEEE Antennas and Wireless Propagation Letters. - 1548-5757 .- 1536-1225. ; 19:2, s. 302-306
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Tidskriftsartikel (refereegranskat)abstract
- H-plane horn antenna using gap waveguide technology is proposed. The advantage of this technology is its air-filled feature, which improves the impedance matching compared with substrate integrated waveguide (SIW) horn antennas. Corrugated walls as soft surfaces are used on the outer surfaces of the upper and lower horn plates, which act as barriers around the aperture of the antenna and reduce its backlobe levels. The bandwidth of the antenna for $| {{S_{11}}} |$< -10 dB is 19-28 GHz and the gain varies between 8.5 and 12 dBi. The total efficiency is better than 88% in the operation bandwidth. This structure has the capability of easily integrating with other planar microwave components. As a demonstration, a coupled-resonator filter is integrated with the antenna to select the desired frequency band and cancel the out-of-band harmonics. For the proof of concept, a prototype model is fabricated and tested, where measurement data agree well with the simulation results.
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| 2. |
- Zarifi, Davoud, et al.
(författare)
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A V-Band Low Sidelobe Cavity-Backed Slot Array Antenna Based on Gap Waveguide
- 2020
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Ingår i: 14th European Conference on Antennas and Propagation, EuCAP 2020.
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Konferensbidrag (refereegranskat)abstract
- A cavity-backed slot antenna array element is designed to operate in V-band with low sidelobe level (SLL). The 2 - 4 element array is fed by a groove gap waveguide (GGW) cavity in the bottom layer. Simulated results indicate that the array element can achieve a 7.4% bandwidth (59.7-64.3 GHz) with a gain of more than 16.5 dBi. Besides, the low SLL characteristic is achieved and the simulated first SLLs are below -20 dB across the desired working band.
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| 3. |
- Zarifi, Davoud, et al.
(författare)
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Design and development of broadband gap waveguide-based 0-dB couplers for Ka-band applications
- 2022
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Ingår i: IET Microwaves, Antennas and Propagation. - : Institution of Engineering and Technology (IET). - 1751-8725 .- 1751-8733. ; 16:11, s. 718-724
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Tidskriftsartikel (refereegranskat)abstract
- 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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| 4. |
- Zarifi, Davoud, et al.
(författare)
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Design of a dual-CP gap waveguide fed aperture array antenna
- 2023
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Ingår i: IET Microwaves, Antennas and Propagation. - 1751-8725 .- 1751-8733. ; 17:9, s. 723-730
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Tidskriftsartikel (refereegranskat)abstract
- A slot array antenna with dual-circular polarisation (CP) is presented in this paper. To overcome the fabrication and loss challenges in mm-wave frequencies, the gap waveguide technique is utilised. The right and left hand circular polarisation (RHCP and LHCP) radiations are achieved using slots-fed stepped septum polariser on the longitudinal slot arrays. The waveguides and feeding layer are based on ridge gap waveguide. The experimental results demonstrate the |S-11| and axial ratio of proposed antenna array are lower than -10 and 2 dB, respectively over the frequency range of 29.1-31.7 GHz. The proposed antenna exhibits the measured peak gain of 27.2 dBic at 30.2 GHz. The results prove that the proposed array antenna is a brilliant choice for 30 GHz-band applications and could be developed to realise larger dual-polarised planar arrays.
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