| 61. |
- Ren, Qiannan, 1994, et al.
(författare)
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Millimeter-Wave Vertical Transitions between Ridge Gap Waveguides and Microstrip Lines for Integration of MMIC with Slot Array
- 2021
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Ingår i: 15th European Conference on Antennas and Propagation, EuCAP 2021.
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Konferensbidrag (refereegranskat)abstract
- This paper presents two low-loss vertical transitions between ridge gap waveguides and microstrip lines. The transitions can be utilized as packaging techniques for system level integration of MMICs with waveguide components such as slot array antennas. Both vertical transitions feature microstrip lines being the bottom layer but facing opposite directions. The first vertical transition consists of a microstrip line facing upwards with a patch in the end. Simulation results show that the reflection coefficient is better than -15 dB from 74 to 82 GHz. The second transition of microstrip line facing downwards features E-plane probe with back-short cavity surrounded by periodic pins. Simulation results show that the reflection coefficient is better than -15 dB from 71 to 86 GHz. Comparing with other same layer transitions, the vertical solutions provide more flexibility for the routing of antenna feeding line and have the ability of implementing a more compact design.
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| 62. |
- Ren, Qiannan, 1994, et al.
(författare)
-
Novel Integration Techniques for Gap Waveguides and MMICs Suitable for Multilayer Waveguide Applications
- 2022
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480 .- 1557-9670. ; 70:9, s. 4120-4128
-
Tidskriftsartikel (refereegranskat)abstract
- This article discusses three integration and packaging techniques for gap waveguides and monolithic microwave integrated circuits (MMICs) suitable for multilayer waveguide applications. Two vertical transitions between microstrips and ridge gap waveguides (RGWs) are presented. The first vertical transition connects RGW to a microstrip line from the top where a rectangular patch has been used. Measured results of the transition in a back-to-back structure show that the reflection coefficient is better than $-$ 10 dB from 75 to 83 GHz, and the insertion loss for a single transition over the frequency band is 0.65–0.85 dB. The second vertical transition connects RGW to a microstrip line from the back by a slot in the ground plane. Measured results of the transition in a back-to-back structure show that the reflection coefficient is better than $-$ 10 dB from 69 to 86 GHz, and the insertion loss for a single transition is 0.65–1 dB over the frequency band. Commercially available E-band MMIC amplifiers are integrated with RGWs using the two proposed transitions. Moreover, for the very first time, the integration of MMIC with inverted microstrip gap waveguide (IMGW) is realized by a compact packaging structure that utilizes bond wires and capacitive pads. All the three active integrations are consistent with the passive measurements in terms of operational bandwidth, losses, amplifier gain flatness, and unwanted resonance suppression.
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| 63. |
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| 64. |
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| 65. |
- Risacher, Christophe, 1976, et al.
(författare)
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A 275-370 GHz SIS Mixer for the APEX Telescope
- 2004
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Ingår i: in “Proceedings of SPIE in Millimeter and Submillimeter Detectors for Astronomy II”, 23-25 June 2004, Glasgow, Scotland, United Kingdom, eds. J. Zmuidzinas, W. Holland, S. Withington, SPIE. ; 5498, s. 140-148
-
Konferensbidrag (refereegranskat)
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| 66. |
- Risacher, C., et al.
(författare)
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A 279-381 GHz SIS Receiver for the APEX Telescope
- 2006
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Ingår i: Proceedings of the 16th International Symposium on Space Terahertz Technology, Chalmers University of Technology, Gothenburg, Sweden, May 2-4, 2005. ; , s. 432-437
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 67. |
- Risacher, Christophe, 1976, et al.
(författare)
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A sideband separation SIS mixer for 275-370 GHz for the APEX telescope
- 2006
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 081946340X ; 6275, s. 62751T-
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Konferensbidrag (refereegranskat)abstract
- The Atacama Pathfinder EXperiment (APEX) is a 12 m antenna now operating at the Llano Chajnantor on the Atacama Desert in Northern Chile at 5 100 m altitude. APEX will be equipped with single-pixel heterodyne receivers covering 211 - 1500 GHz frequency range. We present a sideband separation (2SB) mixer using superconducting-insulator-superconductor (SIS) junction for the APEX band 2, 275-370 GHz. The 2SB mixer is based on a previous development of a double sideband (DSB) mixer, which is currently installed at the APEX telescope. This DSB receiver has a noise temperature of about 40-50 K across the band, and, as installed on one of the best site on the Earth, yields total DSB system noise temperatures of about 100 K for excellent weather.
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| 68. |
- Sundin, Erik, 1979, et al.
(författare)
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Cryogenic LNA Characterization with SIS Junction as Noise Source
- 2006
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Ingår i: Proceedings of the 16th International Symposium on Space Terahertz Technology, May 2-4, 2005, Chalmers University of Technology, Gothenburg, Sweden. ; , s. 188-190
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 69. |
- Uz Zaman, Ashraf, 1975, et al.
(författare)
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Increasing parallel plate stop-band in gap waveguides using inverted pyramid-shaped nails for slot array application above 60GHz
- 2011
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Ingår i: Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. Rome, 11-15 April 2011. - 9788882020743 ; , s. 2254-2257
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Konferensbidrag (refereegranskat)abstract
- This paper presents a proposal for a slot array antenna for frequencies above 60 GHz. Also, The array is using the new air gap waveguide as a feeding structure. Here we present a new structure for the parallel plate stop-band based on replacing the uniform cross sectional nails with inverted pyramidal shaped pins. This new type of pin is more suitable for micromachining and manufacturing of gap waveguides above 60 GHz. The wider parallel-plate bandwidth achieved with this new type of pins makes it suitable for integration of very wideband active MMIC circuit with gap waveguide without package resonance problem. Once the RF circuitry is integrated with gap waveguide, the slot arrays can be easily built by having slots on the top metal wall of the gap waveguide thus enabling low cost integrated antenna solution at frequencies above 60GHz.
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| 70. |
- Uz Zaman, Ashraf, 1975, et al.
(författare)
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Millimeter Wave E-Plane Transition From Waveguide to Microstrip Line With Large Substrate Size Related to MMIC Integration
- 2016
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Ingår i: IEEE Microwave and Wireless Components Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-1764 .- 1531-1309. ; 26:7, s. 481-483
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Tidskriftsartikel (refereegranskat)abstract
- This letter demonstrates a packaging concept where a waveguide-to-microstrip transition can be assimilated on a mm-wave MMIC of an arbitrary size and thus avoid the use of bond wires at the high frequency ports of the MMIC circuit. The advantage of the proposed concept is that-it does not require an extra substrate with sub-critical dimensions for the waveguide-to-microstrip transition. The transition can be integrated onto the MMIC, and thus the MMIC can be coupled directly to the waveguide. A Perfect Magnetic Conductor (PMC) surface is used to suppress the unwanted waveguide mode coupling to the oversized circuit cavity. The measured back-to-back transition works over the frequency band 66-98 GHz (relative BW of 38%) with minimum return loss of 12.7 dB. The total insertion loss of the manufactured prototype is found to be 3.26 dB, which also includes a 14.8 mm long microstrip line on an Alumina substrate. The losses in a single transition vary between 0.25 and 0.42 dB.
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