Sun, 27 Jul 2008 07:50:02 BST CiteULike: dcastro's Ma http://www.citeulike.org/user/dcastro/author/Ma CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2802015 <i>Electronics Letters, Vol. 35, No. 25. (1999), pp. 2163-2164.</i><br /><br />Active receiving antennas with an integrated filter, amplifier, mixer and local oscillator have significant radiation at the local oscillator frequency. This radiation may be out of band and could be a problem in cluttered environments. In this Letter, the problem is evaluated through measurements and simulation on integrated microstrip patch antennas Local oscillator radiation from active integrated antennas G Ma PS Hall P Gardner M Hajian doi:10.1049/el:19991482 Electronics Letters, Vol. 35, No. 25. (1999), pp. 2163-2164. 2008-05-15T15:30:24-00:00 1999 Electronics Letters 35 25 2163 2164 active antennas integrated local oscillator http://www.citeulike.org/user/dcastro/article/2776272 <i>Electron Devices Meeting, 1997. IEDM '97. Technical Digest., International (1997), pp. 301-304.</i><br /><br />The rapid growth of wireless systems at radio frequencies (RF) is driving the need for improved analog circuit and device analysis at gigaHertz frequencies. This includes: low noise front ends, linear amplifiers, mixers, and power amplifiers. Moreover, the parasitic effects of capacitance and inductance, both on- and off-chip, require careful extraction and characterization in support of predictive modeling. While time-domain techniques work well for digital systems, often the spectral and dynamic range requirements for communications systems necessitate accurate analysis of harmonic content with frequency differences of a thousandfold or more. This paper demonstrates the applicability and unique strengths of device-level harmonic balance (HB) in the simulation and physical modeling of RF circuits Device simulation for RF applications RW Dutton B Troyanovsky Z Yu T Arnborg F Rotella G Ma J Sato-Iwanaga doi:10.1109/IEDM.1997.650386 Electron Devices Meeting, 1997. IEDM '97. Technical Digest., International (1997), pp. 301-304. 2008-05-09T16:40:13-00:00 1997 Electron Devices Meeting, 1997. IEDM '97. Technical Digest., International 301 304 rf simulation http://www.citeulike.org/user/dcastro/article/2776271 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 991-999.</i><br /><br />This paper describes how device simulation may be used for the modeling, analysis, and design of radio-frequency (RF) laterally diffused metal-oxide-semiconductor (LDMOS) transistors. Improvements to device analysis needed to meet the requirements of RF devices are discussed. Key modeling regions of the LDMOS device are explored and important physical effects are characterized. The LDMOS model is compared to dc and small-signal ac measurements for calibration purposes. Using the calibrated model, large-signal accuracy is verified using harmonic distortion simulation, and intermodulation analysis. Predictive analysis and a study of the structure's parasitic components are also presented. Load-pull simulation is used to analyze matching network effects to determine the best choices for device impedance matching Modeling, analysis, and design of RF LDMOS devices using harmonic-balance device simulation FM Rotella G Ma Z Yu RW Dutton doi:10.1109/22.904736 Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 991-999. 2008-05-09T16:40:12-00:00 2000 Microwave Theory and Techniques, IEEE Transactions on 48 6 991 999 analysis design model rf simulation http://www.citeulike.org/user/dcastro/article/2776227 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 11. (1999), pp. 2092-2098.</i><br /><br />A novel waveguide using a photonic bandgap (PBG) structure is presented. The PBG structure is a two-dimensional square lattice with each cell consisting of metal pads and four connecting lines, which are etched on a conductor-backed Duroid substrate. This uniplanar compact PBG structure realizes a magnetic surface in the stopband and is used in the waveguide walls to provide magnetic boundary conditions. A relatively uniform field distribution along the cross section has been measured at frequencies from 9.4 to 10.4 GHz. Phase velocities close to the speed of light have also been observed in the stopband, indicating that TEM mode has been established. A recently developed quasi-Yagi antenna has been employed as a broad-band and efficient waveguide transition. Meanwhile, full-wave simulations using the finite-difference time-domain method provide accurate predictions for the characteristics of both the perfect magnetic conductor impedance surface and the waveguide structure. This novel waveguide structure should find a wide range of applications in different areas, including quasi-optical power combining and the electromagnetic compatibility testing A novel TEM waveguide using uniplanar compact photonic-bandgap (UC-PBG) structure Fei-Ran Yang Kuang-Ping Ma Yongxi Qian T Itoh doi:10.1109/22.798004 Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 11. (1999), pp. 2092-2098. 2008-05-09T16:10:18-00:00 1999 Microwave Theory and Techniques, IEEE Transactions on 47 11 2092 2098 pbg http://www.citeulike.org/user/dcastro/article/2776179 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 11. (1999), pp. 2123-2130.</i><br /><br />The recently developed uniplanar compact photonic bandgap (UC-PBG) substrate is successfully used to reduce surface-wave losses for an aperture-coupled fed patch antenna on a thick high dielectric-constant substrate. The surface-wave dispersion diagram of the UC-PBG substrate has been numerically computed for two different substrate thickness (25 and 50 mil) and found to have a complete stopband in the frequency range of 10.9-13.5 and 11.4-12.8 GHz, respectively. The thicker substrate is then used to enhance broadside gain of a patch antenna working in the stopband at 12 GHz. Computed results and measured data show that, due to effective surface-wave suppression, the antenna mounted on the UC-PBG substrate has over 3-dB higher gain in the broadside direction than the same antenna etched on a grounded dielectric slab with same thickness and dielectric constant. Cross-polarization level remains 13 dB down the co-polar component level for both E- and H-planes Aperture-coupled patch antenna on UC-PBG substrate R Coccioli Fei-Ran Yang Kuang-Ping Ma T Itoh doi:10.1109/22.798008 Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 11. (1999), pp. 2123-2130. 2008-05-09T15:42:39-00:00 1999 Microwave Theory and Techniques, IEEE Transactions on 47 11 2123 2130 antenna patch pbg http://www.citeulike.org/user/dcastro/article/2762218 <i>Electronics Letters, Vol. 34, No. 21. (1998), pp. 2041-2042.</i><br /><br />The realisation of a magnetic conducting surface using a novel two-dimensional uniplanar photonic bandgap structure is described. This novel idea is verified by measured results and the results obtained using the finite-difference time-domain method Realisation of magnetic conducting surface using novel photonic bandgap structure KP Ma K Hirose FR Yang Y Qian T Itoh Electronics Letters, Vol. 34, No. 21. (1998), pp. 2041-2042. 2008-05-06T18:28:49-00:00 1998 Electronics Letters 34 21 2041 2042 pbg http://www.citeulike.org/user/dcastro/article/2762146 <i>Electron Devices Meeting, 1996., International (1996), pp. 91-94.</i><br /><br />High efficiency, high gain power transistors are required to meet RF performance and output specifications as new generation portable communication products move towards lower voltage operations. A low cost, high efficiency silicon MOSFET using RFLDMOS (LV2) technology was developed in Motorola to operate at 3.4-12.5 V drain voltages. The LV2 device can deliver 70% power added efficiency with 12 dB gain, 31.5 dBm output power at 3.4 V and 850 MHz. This is the best known RF performance for silicon devices at 3.4 V. This paper focuses on 3.4 V LV2 device optimization and performance High efficiency LDMOS power FET for low voltage wireless communications G Ma W Burger C Dragon T Gillenwater doi:10.1109/IEDM.1996.553129 Electron Devices Meeting, 1996., International (1996), pp. 91-94. 2008-05-06T17:42:46-00:00 1996 Electron Devices Meeting, 1996., International 91 94 amplifier http://www.citeulike.org/user/dcastro/article/2762145 <i>Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480), Vol. 2 (2001), pp. 475-478 vol.2.</i><br /><br />Two active integrated antennas are implemented to act as direct-conversion receivers. These active antennas can be applied for Doppler frequency detection, I&Q demodulation and direction finding Active integrated antennas using the direct-conversion detection G Ma PS Hall P Gardner M Hajian Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480), Vol. 2 (2001), pp. 475-478 vol.2. 2008-05-06T17:42:44-00:00 2001 Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480) 2 475 478 vol.2 active antenna integrated http://www.citeulike.org/user/dcastro/article/2762144 <i>Electronics Letters, Vol. 37, No. 1. (2001), pp. 3-4.</i><br /><br />A zero-IF receiver is implemented based on the active antenna design. The active devices, Schottky diodes, are compactly integrated with two patch antenna elements to act as the mixers. The active antenna can perform both direct-conversion demodulation and direction finding Zero-IF detection active antenna G Ma S Hall P Gardner M Hajian doi:10.1049/el:20010018 Electronics Letters, Vol. 37, No. 1. (2001), pp. 3-4. 2008-05-06T17:42:42-00:00 2001 Electronics Letters 37 1 3 4 active antenna http://www.citeulike.org/user/dcastro/article/2762143 <i>Microwave and Millimeter Wave Technology, 2000, 2nd International Conference on. ICMMT 2000 (2000), pp. 261-264.</i><br /><br />In this paper, two active antennas with modulation and demodulation functions are introduced. A patch antenna integrated with two Schottky diodes is implemented to fulfil single sideband modulation and I&Q demodulation. A variation of this configuration can carry out double sideband modulation with carrier suppression and homodyne detection. Moreover, some parameters of the active antennas, such as conversion loss and radiation pattern are measured. The active antennas have potential use for direct-conversion radio transceivers in digital communication Direct downconversion active antennas for modulation and demodulation G Ma PS Hall P Gardner M Hajizn doi:10.1109/ICMMT.2000.895671 Microwave and Millimeter Wave Technology, 2000, 2nd International Conference on. ICMMT 2000 (2000), pp. 261-264. 2008-05-06T17:42:41-00:00 2000 Microwave and Millimeter Wave Technology, 2000, 2nd International Conference on. ICMMT 2000 261 264 active antenna http://www.citeulike.org/user/dcastro/article/2762142 <i>Antennas and Propagation Society International Symposium, 2001. IEEE, Vol. 3 (2001), pp. 436-439 vol.3.</i><br /><br />A dual band antenna suitable for mounting on a chip case is introduced. Through an aperture, the power is coupled from the antenna to the circuit (or vice versa). The antenna has compact configuration (11 mm×10mm at 1828 MHz), reasonable gain (about -2.5dBi at 1828 MHz) and low manufacturing cost Dual band antenna mounted on chip case G Ma P Gardner PS Hall doi:10.1109/APS.2001.960128 Antennas and Propagation Society International Symposium, 2001. IEEE, Vol. 3 (2001), pp. 436-439 vol.3. 2008-05-06T17:42:39-00:00 2001 Antennas and Propagation Society International Symposium, 2001. IEEE 3 436 439 vol.3 antenna dual-band http://www.citeulike.org/user/dcastro/article/2762141 <i>Antennas and Propagation Society International Symposium, 1999. IEEE, Vol. 4 (1999), pp. 2378-2381 vol.4.</i><br /><br />Active receiving antennas with integrated amplifier, mixer and local oscillators have significant radiation at the local oscillator frequency. Although this radiation may be out of band, it will be a problem in cluttered environments. In this paper the problem is evaluated through measurements and simulation on integrated microstrip patch antennas at 1.9 GHz. Radiation levels are compared for various substrate materials and configurations. It is concluded that, although reduction in local oscillator radiation can be made, the primary factor is the trade-off between manufacturing simplicity and performance Local oscillator radiation from active integrated antennas G Ma PS Hall P Gardner M Hajian doi:10.1109/APS.1999.789288 Antennas and Propagation Society International Symposium, 1999. IEEE, Vol. 4 (1999), pp. 2378-2381 vol.4. 2008-05-06T17:42:39-00:00 1999 Antennas and Propagation Society International Symposium, 1999. IEEE 4 2378 2381 vol.4 active antenna integrated oscillator http://www.citeulike.org/user/dcastro/article/2709740 <i>Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE (2007), pp. 4291-4295.</i><br /><br />In this paper, a 2times2 multiple-input multiple-output- orthogonal frequency division multiple access (MIMO-OFDMA) uplink transceiver based on IEEE 802.16e-2005 standard is proposed. Carrier frequency offset (CFO) and multipath channel impairments are considered. To mitigate the CFO problems in multiuser environment, an inter-carrier-interference- cancellation-based (ICI-cancellation-based) CFO estimator is proposed. The proposed CFO estimator measures energy dispersion of data compensated by ICI cancellation and channel equalization. With measured energy dispersion, correct CFOs can be obtained by running an iterative search. Compared with other designs, the proposed CFO estimator is more robust in transmission conditions and types of subcarrier allocations. Simulation results demonstrate that the proposed transceiver outperforms others in mean-square-error (MSE) and bit-error- rate (BER) performance. A Baseband Transceiver for IEEE 802.16e-2005 MIMO-OFDMA Uplink Communications Jung-Mao Lin Hsi-Pin Ma Pangan Ting doi:10.1109/GLOCOM.2007.816 Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE (2007), pp. 4291-4295. 2008-04-23T18:29:43-00:00 2007 Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE 4291 4295 mimo ofdma uplink wimax http://www.citeulike.org/user/dcastro/article/2421332 <i>ASIC/SOC Conference, 2002. 15th Annual IEEE International (2002), pp. 479-480.</i> Workshop on transceiver architecture and components for wireless communication system S Martin Zhengxiang Ma ASIC/SOC Conference, 2002. 15th Annual IEEE International (2002), pp. 479-480. 2008-02-24T12:53:18-00:00 2002 ASIC/SOC Conference, 2002. 15th Annual IEEE International 479 480 architecture communication component system transceiver wireless workshop http://www.citeulike.org/user/dcastro/article/2280728 <i>Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 34, No. 2. (1986), pp. 104-111.</i><br /><br />In this paper, we introduce generalized tail biting encoding as a means to ameliorate the rate deficiency caused by zero-tail convolutional encoding. This technique provides an important link between quasi-cyclic block and convolutional codes. Optimum and suboptimum decoding algorithms for these codes are described and their performance determined by analytical and simulation techniques. On Tail Biting Convolutional Codes H Ma J Wolf Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 34, No. 2. (1986), pp. 104-111. 2008-01-23T14:10:48-00:00 1986 Communications, IEEE Transactions on [legacy, pre - 1988] 34 2 104 111 code convolutional correction error viterbi http://www.citeulike.org/user/dcastro/article/1814943 <i>Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on (2007), pp. 527-527.</i><br /><br />Summary form only given. In this talk, we present a new structure to amplify the evanescent waves. The structure is composed of two layers. The first layer is realized by a periodic structure with unit cell of series inductor and shunt capacitor (LC), and the second layer is realized by a periodic structure with unit cell of series capacitor and shunt inductor (CL). We show that both the LC and CL structures are equivalent to the crystal bandgap metamaterials, whose equivalent permittivity and permeability have been derived. Under certain frequency bands, evanescent waves are supported in both LC and CL structures. When such two structures are cascaded together to form a bilayer, we show that evanescent waves existing in two single layers can be amplified exponentially if the resonant conditions are satisfied. Such resonant conditions are equivalent to the anti-matching conditions for the permittivity and permeability of the crystal bandgap metamaterials. We present circuit-simulation results of the LC and CL structures arid theoretical predictions of the equivalent crystal bandgap materials, which have excellent agreements. From the simulation results, we clearly observe the exponentially increasing and decreasing distribution of electric field. We further propose an experiment using lumped capacitors and inductors mounted on a printed circuit board to verify the EWA phenomena. The EWA feature in the LC-LC structure can find important applications in the new-concept microwave components, for example, the extremely-narrow band filters. A New Metamaterial Structure to Amplify Evanescent Waves and Its Applications in Microwave Components Tie Cui Ruopeng Liu Bo Zhao Xian Lin Hui Ma Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on (2007), pp. 527-527. 2007-10-24T10:20:52-00:00 2007 Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on 527 527 antenna metamaterial