| 1. |
- Uz Zaman, Ashraf, 1975, et al.
(författare)
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Overview of High Frequency Electronics Integration Concepts for Gap waveguide based High Gain Slot Antenna Array
- 2019
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Ingår i: 2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems, COMCAS 2019.
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Konferensbidrag (refereegranskat)abstract
- This paper presents an overview of different low-loss microstrip to waveguide transition designs suitable for integrating millimeter wave electronics to a gap waveguide based slot array. Typically, E-plane probe type of transitions are widely used at mmWave frequency range to couple RF signal from a TX/RX MMIC to the waveguide section. H-plane split-blocks are avoided due to leakage problem from tiny slits formed by imperfect metal connections. On the other hand, the traditional slot arrays are built using H-plane split blocks. This makes it very challenging to integrate electronics and other passive components such as diplexer filter directly to a high gain planar antenna array. To overcome this above mentioned problem, we propose to use low-loss H-plane transitions to integrate RF electronics with the multi-layer gap waveguide based slot array. We demonstrate a completely packaged frontend at E-band, showing the potential of the gap waveguide technology to build a very compact full-duplex wireless system.
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| 2. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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A multi-layer gap waveguide array antenna suitable for manufactured by die-sink EDM
- 2016
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Ingår i: 2016 10th European Conference on Antennas and Propagation, EuCAP 2016. - 9788890701863 ; , s. 7481259-
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Konferensbidrag (refereegranskat)abstract
- In this paper, a multilayer wideband slot array antenna is presented for high gain applications at V-band. The proposed antenna consists of three unconnected metal layers based on the recently introduced gap waveguide technology. A 2×2 cavity-backed slot subarray is fed by a ridge gap waveguide corporate distribution network. The subarray is optimized to have wide bandwidth and low grating lobes in an infinite array environment. A simple slot-tilting method is used to fulfill the radiation pattern requirement of the ETSI 302 standard for fixed radio links. A prototype consisting of 16×16 slots is manufactured by die-sink Electric Discharge Machining (EDM), a fast modern planar-3D spark machining method. The measured antenna has a relative bandwidth of 18% with input reflection coefficient better than -10 dB, and the radiation patterns satisfy the ETSI 302 standard co-polar sidelobe envelope over 56-67 GHz frequency band. The measured total aperture efficiency is over most of the frequency band better than 80%.
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| 3. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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An E-band Compact Frequency Division Duplex Radio Front-end Based on Gap Waveguide Technology
- 2019
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Ingår i: 13th European Conference on Antennas and Propagation, EuCAP 2019.
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Konferensbidrag (refereegranskat)abstract
- A compact module consisting of a novel integration of an antenna, a diplexer, and millimeter-wave active circuits for low latency wireless backhaul links working at E-band is presented in this paper. The proposed radio front-end module is built by four distinct layers which are vertically stacked with no electrical contact requirement between them based on gap waveguide technology. A 16×16 corporate-fed slot array antenna is successfully integrated× with a 5th order diplexer, as well as a transmitter (Tx) and a receiver (Rx) monolithic microwave integrated circuits (MMICs) in one package with a novel architecture and a compact form. The integrated radio front-end is able to simultaneously send and receive data by using a frequency division duplex (FDD) transmission scheme at 71-76 GHz and 81-86 GHz bands. A wireless data transmission is successfully demonstrated showing a data rate of 6 Gbit/s using 64 quadrature amplitude modulated (QAM) signal with a spectral efficiency of 4.4 bit/s/Hz. The proposed radio front-end provides the advantages of low loss, high efficiency, compact integration, and a simple mechanical assembly, which makes it a suitable solution for small cell backhaul links.
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| 4. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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Compact Integrated Full-Duplex Gap Waveguide-Based Radio Front End For Multi-Gbit/s Point-to-Point Backhaul Links at E-Band
- 2019
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480 .- 1557-9670. ; 67:9, s. 3783-3797
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents the design and realization of a high data rate radio front-end module for point-to-point backhaul links at E-band. The design module consists of four vertically stacked unconnected metal layers without any galvanic and electrical contact requirements among the building blocks, by using gap waveguide technology. The module components are a high-gain array antenna, diplexer, and circuitry consisting of a transmitter (Tx) and a receiver (Rx) monolithic microwave integrated circuits (MMICs) on a carrier board, which is successfully integrated into one package with a novel architecture and a compact form. The diplexer consists of two direct-coupled cavity bandpass filters with channels at 71-76 GHz and 81-86 GHz with a measured return loss of 15 dB and an isolation greater than 50 dB. A wideband 16 x 16 slot array antenna with a measured gain of more than 31 dBi is used to provide high directivity. The measured results show that the packaged transmitter provides a conversion gain of 22 and 20 dB at 76 and 86 GHz, respectively, with an output power of 14 and 16 dBm at 1-dB gain compression point, at the same frequencies. The packaged receiver shows an average conversion gain of 20 dB at 71-76-GHz and 24 dB at 81-86-GHz bands. A real-time wireless data transmission is successfully demonstrated with a data rate of 8 Gbit/s using 32-quadrature amplitude modulated signal over 1.8-GHz channel bandwidth with spectral efficiency of 4.44 bit/s/Hz. The proposed radio front end provides the advantages of low loss, high efficiency, compact integration, and a simple mechanical assembly, which makes it a suitable solution for small-cell backhaul links.
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| 5. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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E-band 3-D metal printed wideband planar horn array antenna
- 2017
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Ingår i: 21st International Symposium on Antennas and Propagation, ISAP 2016, Okinawa, Japan, 24-28 October 2016. ; , s. 304-305
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Konferensbidrag (refereegranskat)abstract
- This paper presents a wideband and high efficiency corporate-fed horn array antenna in the E-band. A horn antenna is used as the unit cell of the array. The radiation pattern and grating lobe levels of the unit cell are improved by splitting the horn's aperture with a septum in the E-plane. A ridge gap waveguide corporate distribution network feeds the horns with the same amplitude and phase via coupling apertures. A prototype consisting of 4 × 4-element horn array antenna is manufactured by Direct Metal Laser Sintering (DMLS) 3D printing technique. The proposed antenna has a relative bandwidth of 24% with input reflection coefficient better than -10 dB and simulated total antenna efficiency better than 85% over the 69-88 GHz frequency band.
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| 6. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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Wideband and High-Gain Corporate-Fed Gap Waveguide Slot Array Antenna With ETSI Class II Radiation Pattern in V-Band
- 2017
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Ingår i: IEEE Transactions on Antennas and Propagation. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-926X .- 1558-2221. ; 65:4, s. 1823-1831
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Tidskriftsartikel (refereegranskat)abstract
- We present a V-band multilayer corporate-fed slot array antenna with wide impedance bandwidth and high efficiency. The proposed antenna consists of three unconnected metal layers based on the recently introduced gap waveguide technology. A 2 x 2 cavity-backed slot subarray acts as the unit cell of the array. The top metal layer contains the radiating slots, the intermediate layer contains the cavities, formed by pins, and the third layer is the ridge gap waveguide corporate-feed network. The latter is realized by a texture of pins and guiding ridges to uniformly excite the cavities with the same amplitude and phase. The proposed antenna fulfills the radiation pattern requirement of the ETSI 320 standard. A prototype consisting of 16 x 16 slots was manufactured by a fast modern planar 3-D machining method, i.e., die-sink electric discharge machining. The fabricated prototype has a relative impedance bandwidth of 17.6% with input reflection coefficient better than -10 dB. The E- and H-planes radiation patterns satisfy the ETSI class II copolar sidelobe envelope, and the measured cross-polar level is more than -30 dB below the copolar level over the 56-75 GHz frequency band. The measured antenna efficiency is better than 60% over the same band.
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| 7. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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Wideband cavity-backed slot subarray with gap waveguide feed-network for D-band applications
- 2017
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Ingår i: 2017 11th European Conference on Antennas and Propagation, EUCAP 2017. - 9788890701870 ; , s. 207-209
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Konferensbidrag (refereegranskat)abstract
- A simple and wideband subarray for D-band applications is presented in this paper. The proposed multilayer subarray consists of 2 × 2 cavity-backed slot subarray fed by a ridge gap waveguide transmission line. The simulated results show that the proposed subarray has a relative impedance bandwidth of 22.5% with input reflection coefficient better than -10 dB over the 126-158 GHz frequency band. An array antenna consisting of 8 × 8 slots is designed with the proposed subarray. The simulation results of the proposed subarray and antenna are presented.
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| 8. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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Zero-Gap Waveguide: A Parallel Plate Waveguide With Flexible Mechanical Assembly for mm-Wave Antenna Applications
- 2018
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Ingår i: IEEE Transactions on Components, Packaging and Manufacturing Technology. - 2156-3985 .- 2156-3950. ; 8:12, s. 2052-2059
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Tidskriftsartikel (refereegranskat)abstract
- A new gap waveguide concept is presented, where the air gap between the perfect electric conductor and artificial magnetic conductor (AMC) parallel plates of a conventional gap waveguide structure has been reduced to almost zero. When the air gap is reduced, the periodic metal pin layer (which emulates the AMC characteristics) may come in contact with the top metal layer. A statistical analysis of a random contact of the pin texture and the top metal plate in this new type of gap technology guiding structure, so-called zero-gap, is elaborated in this paper. The periodic pin texture creates a stopband for parallel plate modes, and it is also used as a mechanical support while assembling the waveguide structure. This presents a significant manufacturing advantage, especially for corporate feed-network of array antennas at millimeter-wave frequencies. A V -band 8×8 slot array fed with this new waveguide is also designed and manufactured to show the potential of this newly proposed zero-gap waveguide structure. The measured results show 20% of relative impedance bandwidth ( |S11|<−10 dB) and an overall antenna efficiency larger than 60% over the 56.5–69-GHz frequency band.
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