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- Alfonso, E., et al.
(författare)
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Study of the characteristic impedance of a ridge gap waveguide
- 2009
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Ingår i: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9781424436477
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Konferensbidrag (refereegranskat)abstract
- This paper presents a study of the characteristic impedance of a ridge gap waveguide. Ridge gap waveguides belongs to a new metamaterial-based waveguide technology for millimeter and submillimeter waves which emerged recently. A formula for the characteristic impedance of an ideal PEC-over-PMC ridge gap waveguide has been derived. A preliminary numerical study of the characteristic impedance of a real ridge gap waveguide where the PMC is realized by a bed of nails is also presented.
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| 6. |
- Kildal, Per-Simon, 1951, et al.
(författare)
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Direct Coupling as a Residual Error Contribution During OTA Measurements of Wireless Devices in Reverberation Chamber
- 2009
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Ingår i: 2009 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI 2009; North Charleston, SC; United States; 1 June 2009 through 5 June 2009. - 1522-3965. - 9781424436477 ; , s. Art. no. 5171903-
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Konferensbidrag (refereegranskat)abstract
- We have presented an improved theory for the uncertainty of measurements in reverberation chamber. The theory is obtained by including the error due to the direct coupling between the antenna under test and the wall-mounted antennas. The theory includes the Rician K-factor that can be estimated from simple formulas, and an empirical mechanical stirring bandwidth Bmech that is adjusted to get good agreement with the measured STDs. However, Bmech is fixed for a given chamber and stirrer configuration. The new theory is able to describe variations of uncertainty with frequency and loading, and it can very well predict the degradation when platform and polarization stirring is not used. The validation of the theory is representative for efficiency measurements, but it will be equivalent for measuring total radiated power and receiver sensitivity.
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| 10. |
- Uz Zaman, Ashraf, 1975, et al.
(författare)
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Design of Transition from Coaxial Line to Ridge Gap Waveguide
- 2009
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Ingår i: 2009 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI 2009; North Charleston, SC; United States; 1 June 2009 through 5 June 2009. - 1522-3965. - 9781424436477
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Konferensbidrag (refereegranskat)abstract
- This paper presents the design of a simple transition from ridge gap waveguide to coaxial line transition. First, a straight ridge gap waveguide with single transition on end is simulated. Then a ridge gap waveguide with two 90° bends is simulated with two transitions on each end. Available commercial FDTD simulation tool was used to design the transitions. A return loss of -10 dB was achieved over the frequency band of 12- 15.75 GHz.
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| 11. |
- Ying, Zhinong, et al.
(författare)
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Diversity antenna terminal evaluation
- 2005
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Ingår i: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1947-1491 .- 1522-3965. - 0780388836 ; 2 A, s. 375-378
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Konferensbidrag (refereegranskat)abstract
- Simulated and measured correlation and diversity performance for a couple of two-antenna concepts are presented. The results indicate that the three-dimensional isotropic incident field is a good reference case to evaluate diversity performance in a multi-antenna application.
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