| 1. |
- Gong, Shaofang, et al.
(författare)
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Radio Architecture for Parallel Processing of Extremely High Speed Data
- 2009
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Ingår i: IEEE International Conference on Ultra-Wideband, ICUWB, Vancouver, Canada, 9-11 Sept.. - : IEEE. - 9781424429301 ; , s. 433-437
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Konferensbidrag (refereegranskat)abstract
- Using our own-developed frequency multiplexing network, a radio architecture for parallel radio signal processing has been proposed for achieving extremely high data rate above 10 Gbit/s. To meet the high requirement on phase linearity, amplitude balance and low noise figure in a very large bandwidth, our own-developed ultra-wideband six-port correlator has been utilized for the modulator and demodulator in the radio architecture.
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| 2. |
- Karlsson, Magnus, et al.
(författare)
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Dipole antenna with integrated balun for ultra-wideband radio 6-9 GHz
- 2011
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Ingår i: Microwave and optical technology letters (Print). - : Wiley. - 0895-2477 .- 1098-2760. ; 53:1, s. 180-184
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Tidskriftsartikel (refereegranskat)abstract
- A fully integrated dipole antenna with a balun fot ulna wideband (UWB) radio in the band 6-9 GHz utilizing a flexible and rigid printed count board is presented in this at tide The balun utilizes broadside coupled microstrips and is integrated in the rigid part of the printed coma boat d whereas the radiator is placed in the flexible pat! The antenna with the balun covets the frequency band 6 0-8 5 GHz at voltage standing mate ratio (VSWR) <2 0 and 55-110 GHz at VSWR < 2 5 Moreover simulated and measured radiation patterns and antenna efficiency above 860% are observed.
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| 3. |
- Owais, Owais, et al.
(författare)
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Wideband planar antenna with modified ground plane
- 2010
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Ingår i: Microwave and optical technology letters (Print). - : Wiley. - 0895-2477 .- 1098-2760. ; 52:11, s. 2581-2585
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Tidskriftsartikel (refereegranskat)abstract
- In this article a miniaturized planar antenna is presented for broadband applications. Antenna miniaturization is achieved by modifying the ground plane that creates a different current path thus increasing the effective dimension of the antenna. In addition, dual chopping, slitting, and radiator position offsetting provide wideband behavior and relatively good impedance matching. The low profile antenna with its wide bandwidth, linear phase response and quasi-omnidirectional radiation pattern is attractive for the existing and future communication devices of small size. Simulated and measured results for the proposed antenna are presented and analyzed.
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| 4. |
- Serban, Adriana, et al.
(författare)
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Six-Port Direct Carrier Modulator at 7.5 GHz for Ultra-Wideband Appliations
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- A 7.5 GHz direct-carrier modulator for multi-level quadrature amplitude modulation (M-QAM) using a wideband 7-8 GHz six-port correlator and four controllable impedance terminations implemented with field-effect transistors (FET) is presented in this paper. The proposed encoding schemes of the reflection-type modulator is based on equal impedance values at I and Q ports, such that Γ3 = Γ4 and Γ5 = Γ6 for every symbol in the constellation diagram. The field-effect transistors are operated at zero drain-source voltage (cold-FET). The FET-impedance termination topology includes a source resistor (RS) and a gate resistor (RG) for symmetrical spreading of the reflection coefficients around the origin. In order to validate the 7.5 GHz six-port modulator with cold-FET impedance terminations, the six-port modulator prototype has been realized on a ROGERS4350B substrate of 0.254-mm thickness and tested with a six-port demodulator (receiver). The six-port modulator was measure to have symbol rates of 10 Msymbol/s with QPSK (= 20 Mbit/s) and 250 Msymbol/s with 16-QAM (= 1 Gbit/s).
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| 5. |
- Serban, Adriana, 1954-, et al.
(författare)
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Six-port transceiver for 6-9 GHz ultrawideband systems
- 2010
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Ingår i: Microwave and optical technology letters (Print). - : Wiley. - 0895-2477 .- 1098-2760. ; 42:3, s. 740-746
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Tidskriftsartikel (refereegranskat)abstract
- An ultrawideband 6-9 GHz six-port correlator is designed and manufactured.Based on this six-port correlator, behavioral models, and true component circuit designs of a transceiver are developed to study the performance of the proposed direct conversion ultrawideband transceiver topology. A new six-port modulator with controllable impedance terminations implemented with a field effect transistor in the linear operation region is presented
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| 6. |
- Östh, Joakim, et al.
(författare)
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Diode Configurations in Six-Port Receivers with Simplified Interface to Amplifier and Filter
- 2010
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Ingår i: 2010 IEEE International Conferenceon Ultra-Wideband (ICUWB2010). - Piscataway, NJ, USA : IEEE. - 9781424453061 - 9781424453054 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- This paper presents two new diode configurations for use with six-port based demodulators. The first proposed diode configuration allows a simplified diode to filter/amplifier interface. The second configuration allows for full-wave rectification and suppression of odd-order harmonics. A demodulator prototype utilizing the new diode concept is designed for a center frequency of 7.5 GHz and with a bandwidth of 1 GHz for verification. The demodulator includes the six-port correlator, diodes and amplifiers needed to recover the baseband data.
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| 7. |
- Östh, Joakim, et al.
(författare)
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Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage
- 2011
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Ingår i: IEEE transactions on microwave theory and techniques. - : IEEE Institute of Electrical and Electronics. - 0018-9480 .- 1557-9670. ; 59:3, s. 741-747
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a direct carrier six-port modulator. To allow arbitrary load impedances to be used and for suppression of carrier leakage, a new circuit architecture with a technique to suppress carrier leakage is proposed and implemented. A theoretical model of the proposed modulator is derived. A prototype modulator utilizing diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz for verification of the proposed technique. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 100 Msymbol/s is generated, as well as good carrier leakage suppression.
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| 8. |
- Östh, Joakim, et al.
(författare)
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Six-Port Gigabit Demodulator
- 2011
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Ingår i: IEEE transactions on microwave theory and techniques. - : IEEE Institute of Electrical and Electronics. - 0018-9480 .- 1557-9670. ; 59:1, s. 125-131
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents measurement results for a six-port-based demodulator designed for a center frequency of 7.5 GHz and with a bandwidth of 1 GHz for operation in the ultra-wideband band. The demodulator includes the six-port correlator, diodes, and amplifiers needed to recover the baseband data. Measurement results show that the prototype supports data rates at 1.7 Gbit/s with bit-error rate 5 . 10(-5) if a two-tap linear equalizer is used and bit-error rate 4 . 10(-3) if only threshold detection is used. The measured performance of the used six-port correlator including the amplifiers is presented and their influence on the overall system performance is discussed. Limitations in the present system and possible improvements are also considered.
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| 9. |
- Gong, Shaofang, et al.
(författare)
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Broadside-Coupled Microstrip Lines as Low Loss Metamaterial for Microwave Circuit Design
- 2019
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Ingår i: Wireless Communications & Mobile Computing. - : WILEY-HINDAWI. - 1530-8669 .- 1530-8677. ; 2019
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Tidskriftsartikel (refereegranskat)abstract
- The entire microwave theory is based on Maxwells equations, whereas the entire electronic circuit theory is based on Kirchhoffs electrical current and voltage laws. In this paper, we show that the traditional microwave design methodology can be simplified based on a broadside-coupled microstrip line as a low loss metamaterial. That is, Kirchhoffs laws are still valid in the microwave spectrum for narrowband signals around various designated frequencies. The invented low loss metamaterial has been theoretically analyzed, simulated, and experimentally verified in both time and frequency domains. It is shown that the phase velocity of a sinusoidal wave propagating on the low loss metamaterial can approach infinity, resulting in time-space shrink to a singularity as seen from the propagating wave perspective.
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| 10. |
- Gong, Shaofang, 1960-, et al.
(författare)
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Design of a radio front-end module at 5 GHz
- 2004
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Ingår i: 6th Circuits and System Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication,2004. - Piscataway, CA, USA : IEEE. ; , s. 241-
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Konferensbidrag (refereegranskat)
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