Thu, 07 Aug 2008 21:58:15 BST CiteULike: dcastro's front-end http://www.citeulike.org/user/dcastro/tag/front-end CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2801442 <i>Microwave Symposium Digest, 1999 IEEE MTT-S International, Vol. 4 (1999), pp. 1409-1411 vol.4.</i><br /><br />A C-band direct conversion receiver front-end based on a resistive FET mixer has been developed. Resistive FET mixers, as opposed to other configurations, require only gate bias and no drain bias. Thus the baseband signal can be easily filtered from the drain terminal. The resistive FET mixer is integrated with rectangular microstrip patch antenna, yielding a compact receiver front-end. A prototype was constructed and demonstrated satisfactory demodulation of a BPSK modulated RF signal C-band direct conversion receiver front-end using a resistive FET mixer S Lin Yongxi Qian T Itoh doi:10.1109/MWSYM.1999.780213 Microwave Symposium Digest, 1999 IEEE MTT-S International, Vol. 4 (1999), pp. 1409-1411 vol.4. 2008-05-15T12:09:03-00:00 1999 Microwave Symposium Digest, 1999 IEEE MTT-S International 4 1409 1411 vol.4 c-band conversion direct fet front-end mixer receiver resistive http://www.citeulike.org/user/dcastro/article/2782065 <i>Microwave Conference, 2000 Asia-Pacific (2000), pp. 888-894.</i><br /><br />In this paper, we present two novel design architectures that utilizing either a periodic structure or an active integrated antenna (AIA) for harmonic tuning in transmitter front-end designs. These techniques promise to significantly improve the power amplifier efficiency, reduce losses and weight, as well as maintaining good linearity requirements of advanced wireless communication systems. We will illustrate these two concepts through several design examples that have been developed recently, including a power amplifier integrated with novel PBG ground plane for harmonic tuning and four push-pull PA design examples, where the AIA concept is implemented to allow antenna to serve as a power combiner, a harmonic tuning load, in addition to its original functionality as a radiating element High efficiency transmitter front-ends integrated with planar antennas and PBG CY Hang WR Deal Yongxi Qian T Itoh doi:10.1109/APMC.2000.925972 Microwave Conference, 2000 Asia-Pacific (2000), pp. 888-894. 2008-05-10T00:03:23-00:00 2000 Microwave Conference, 2000 Asia-Pacific 888 894 antenna efficiency front-end high integrated pbg planar transmitter http://www.citeulike.org/user/dcastro/article/2776279 <i>Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 150, No. 4. (2003), pp. 290-294.</i><br /><br />Two methods for achieving a complete RF front end equipped with its radiator within a single chip package are presented. This packaging technique, which uses a parasitic radiator, provides an alternative solution to problems associated with reduced size electrically small antennas, such as restoration of the antenna gain to 6 dBi and increasing its bandwidth to over 4%. Several parasite configurations have been described and sensitivity of the overall antenna performance to coupling height, parasite dimension, and position with respect to the feed antenna have been assessed. Circular polarisation of such a configuration using a truncated square parasite has also been demonstrated. Novel RF front end antenna package PCT Song PS Hall H Ghafouri-Shiraz doi:10.1049/ip-map:20030414 Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 150, No. 4. (2003), pp. 290-294. 2008-05-09T16:41:52-00:00 2003 Microwaves, Antennas and Propagation, IEE Proceedings - 150 4 290 294 antenna front-end rf http://www.citeulike.org/user/dcastro/article/2768659 <i>Radio Frequency Integrated Circuits (RFIC) Symposium, 2001. Digest of Papers. 2001 IEEE (2001), pp. 213-216.</i><br /><br />This paper presents the results of an antenna switch/filter module integrating GSM/DCS/PCS diplexer functions and Rx/Tx antenna switching on a low temperature co-fired ceramic (LTCC) substrate. Although the RF front-end module (FEM) was configured for dual-band (GSM/DCS) applications, the high pass filter function was designed to operate in the PCS band as well. Harmonic filtering was included in the diplexer design, which reduced the filtering requirements for the power amplifier. The 50-ohm in/out FEM utilized GaAs PHEMT switches and associated bias passives surface mounted on the LTCC substrate. S-parameter characterization of the FEM demonstrated excellent insertion and return loss characteristics. For GSM, the return and insertion losses measured at 912 MHz were better than 28 dB and less than 1.7 dB, respectively. Similarly, for DCS applications, the return and insertion losses at 1.77 GHz were better than 19 dB and less than 1.5 dB, respectively. In both cases, the design approach yielded excellent agreement between measured and simulated results Design of an LTCC switch diplexer front-end module for GSM/DCS/PCS applications R Lucero W Qutteneh A Pavio D Meyers J Estes doi:10.1109/RFIC.2001.935678 Radio Frequency Integrated Circuits (RFIC) Symposium, 2001. Digest of Papers. 2001 IEEE (2001), pp. 213-216. 2008-05-08T06:40:26-00:00 2001 Radio Frequency Integrated Circuits (RFIC) Symposium, 2001. Digest of Papers. 2001 IEEE 213 216 design diplexer front-end gsm http://www.citeulike.org/user/dcastro/article/2768634 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 52, No. 5. (2004), pp. 1425-1432.</i><br /><br />This paper presents multifunctional microstrip transmission lines for designing a high port-isolation dual-frequency orthogonally polarized rectangular patch antenna and the antenna-integrated power amplifier. The proposed lines were realized through the integration of defected ground structures (DGSs) with conventional microstrip lines. A spiral-shaped DGS-integrated microstrip line enhances the port isolation of the antenna, while feeding the 2.0-GHz excitation to the antenna and filtering out the 2.5-GHz receiving signal from the other port. High-order harmonic signal suppression of the power amplifier at the 2.5-GHz port was accomplished by the dumbbell-shaped DGS, thereby improving the efficiency of the amplifier. Measurements show an improvement of 20 dB in port isolation and 3% in power-added efficiency relative to an identical RF front-end, but integrated with a conventional patch antenna. An image impedance of the DGS-integrated microstrip lines can be controlled by the integrated DGS geometries. Relatively high-impedances lines, i.e., 150 and 100 /spl Omega/, are effectively implemented using microstrip lines with 75- and 50-/spl Omega/ linewidths by incorporating the spiral- and dumbbell-shaped DGSs, respectively. Multifunctional microstrip transmission lines integrated with defected ground structure for RF front-end application Younkyu Chung Seong-Sik Jeon Shinho Kim D Ahn Jae-Ick Choi T Itoh doi:10.1109/TMTT.2004.827013 Microwave Theory and Techniques, IEEE Transactions on, Vol. 52, No. 5. (2004), pp. 1425-1432. 2008-05-08T06:29:01-00:00 2004 Microwave Theory and Techniques, IEEE Transactions on 52 5 1425 1432 front-end microstrip tl http://www.citeulike.org/user/dcastro/article/2763869 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 10. (2005), pp. 3082-3089.</i><br /><br />The use of direct RF sampling has been explored as a means of designing multifrequency RF front ends. Such front ends will be useful to multifrequency RF applications such as global navigation satellite system receivers that use global positioning system (GPS) L1, L2, and L5 signals and Galileo signals. The design of a practical multifrequency direct RF sampling front end is dependent on having an analog-to-digital converter whose input bandwidth accommodates the highest carrier frequency and whose maximum sampling frequency is more than twice the cumulative bandwidth about the multiple carrier signals. The principle of direct RF sampling is used to alias all frequency bands of interest onto portions of the Nyquist bandwidth that do not overlap. This paper presents a new algorithm that finds the minimum sampling frequency that avoids overlap. This design approach requires a multifrequency bandpass filter for the frequency bands of interest. A prototype front end has been designed, built, and tested. It receives a GPS coarse/acquisition code at the L1 frequency and GPS antispoofing precision code at both L1 and L2. Dual-frequency signals with received carrier-to-noise ratios in excess of 52 dB-Hz have been acquired and tracked using this system. Design and practical implementation of multifrequency RF front ends using direct RF sampling ML Psiaki SP Powell Hee Jung PM Kintner doi:10.1109/TMTT.2005.855127 Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 10. (2005), pp. 3082-3089. 2008-05-07T06:08:30-00:00 2005 Microwave Theory and Techniques, IEEE Transactions on 53 10 3082 3089 design frequency front-end galileo gnss gps multi rf sampling http://www.citeulike.org/user/dcastro/article/2762154 <i>Signals, Systems, and Electronics, 1998. ISSSE 98. 1998 URSI International Symposium on (1998), pp. 97-100.</i><br /><br />Modern microwave and millimeter-wave application systems require innovative design architectures for compact, light-weight, low-cost and multiple-functionality RF front-ends. This paper reviews several novel technologies developed recently at the authors' group. First, the active integrated antenna (AIA) and photonic band-gap (PBG) concepts have been incorporated in the design of microwave power amplifiers in an effort to improve their power added efficiency. The second topic covers two new types of planar quasi-optical (PDQ) power combiners, which have been demonstrated to provide an effective solution to heat dissipation problems associated with all current quasi-optical power combining techniques New microwave and millimeter-wave front-end architectures Yongxi Qian V Radisic AR Perkons T Itoh doi:10.1109/ISSSE.1998.738046 Signals, Systems, and Electronics, 1998. ISSSE 98. 1998 URSI International Symposium on (1998), pp. 97-100. 2008-05-06T17:44:45-00:00 1998 Signals, Systems, and Electronics, 1998. ISSSE 98. 1998 URSI International Symposium on 97 100 active antenna front-end http://www.citeulike.org/user/dcastro/article/2762153 <i>Microwave and Millimeter Wave Technology Proceedings, 1998. ICMMT '98. 1998 International Conference on (1998), pp. 5-8.</i><br /><br />The active integrated antenna (ATA) provides a new paradigm for modern microwave and millimeter-wave system designs where compactness, light weight, low cost and multiple functionality are strongly required. This paper reviews some of the recent work in this area which has been carried out by the authors' research group at UCLA Active integrated antennas for microwave front-end technology Yongxi Qian V Radisic AR Perkons T Itoh doi:10.1109/ICMMT.1998.768214 Microwave and Millimeter Wave Technology Proceedings, 1998. ICMMT '98. 1998 International Conference on (1998), pp. 5-8. 2008-05-06T17:44:42-00:00 1998 Microwave and Millimeter Wave Technology Proceedings, 1998. ICMMT '98. 1998 International Conference on 5 8 active antenna front-end integrated microwave