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The orbital angular momentum modes increase the system capacity and the spectral efficiency when multiplexing technology in microwave and optic communication systems is used. Despite its effectiveness, OAM for wireless communications has problems due to its divergence characteristics. In this paper an orbital angular momentum beam by the microwave antenna was presented as a pseudo-bessel mode which...
In this paper, fully controlled interference cancellation module (ICM) for an 18 GHz 2 × 2 line-of-sight (LoS) multiple input, multiple output (MIMO) system is presented. A 2 × 2 LoS MIMO hardware prototype with a 110 MHz channel bandwidth and data rate of 250 Mbps per path (total of 500 Mbps) was fabricated in the 18 GHz band. In the 16-QAM digital modulation test, the experimental results show that...
In this paper, an 18 GHz 2 × 2 line-of-sight (LoS) multiple input, multiple output (MIMO) system for fixed wireless access is presented. The amplitude variation by the antenna beam pattern are calculated in a LoS environment for 2 × 2 MIMO system development. In addition, the theoretical SIR from these variations is extracted and verified through H/W test.
This study investigated the effects of hydrophobic-film-coated stencils on bridging rate and solder print efficiency, defined as the volume ratio of printed solder to the stencil aperture size. Printed solder paste volume was measured by solder paste inspection (SPI). The test printed circuit board (PCB) in this study possessed 0603/0402, ball-grid-array (BGA) package, and bridging test pads printed...
By using radio propagation predictions of Rec. ITU-R P.1546 combined with geographic information, formulations for field calculation and interference analysis are presented in the VHF and UHF bands. To illustrate some computational results for given system parameters, virtual geographic information data are taken into account.
In this paper, and a failure-safe system capable of operating in safety side even upon occurrence of failures was designed where IoT-based sensor nodes allowed fault tolerance based on hardware redundancy. The fault tolerance system masked faults with the application of TMR system and enabled fail-safe control by using a comparator (Exclusive-OR) for fault detection and self-diagnostics. The fault-tolerant...
A novel metallic-rectangular-groove based Cassegrain-type reflectarray antenna is proposed. This antenna is design using overlapping T-block method based on mode-matching method, virtual current cancellation, and superposition principle, thereby obtaining analytic scattering equations in rapidly convergent and numerically efficient integrals. Cassegrain-type antenna has low loss feeding structure...
In this paper, the implementation of a 0.1 um GaAs pHEMT process MMIC LNA, a sub-harmonically pumped (SHP) mixer, and a single-chip receiver for 70/80 GHz point-to-point (PtP) communications are presented. In order to obtain high-gain performance and good flatness for a 15 GHz (71–86 GHz) wideband LNA, we use a 5-stage input/output ports transmission line matching method. In order to decrease package...
In order to achieve high gain antenna in the millimeter wave band, a metallicgrooves based reflectarray antenna excited by an E-plane sectoral horn feeder is proposed. The behaviors of the radiation pattern varying the aperture size of the horn feeder are checked.
In this paper, wireless PtP system in E-band (70/80 GHz) for gigabit ethernet link was designed and fabricated. To two-way communication of FDD(frequency division diplexing), two types of transmitter/receiver were made. The conversion gains of transmitter were 7-12 dB and 15-25 dB respectively and P1dBs were both max 16 dBm. The conversion gains of receiver were -6-0 dB and 10-20 dB respectively....
In this paper, we present the performance evaluation of the anti-collision algorithm used in the RFID EPC global generation-2 (Gen2) standard using Miller modulation in AWGN environments. In order to improve the anti-collision performance in the noise environment, we use Miller sub-carrier modulation rather than F 0 waveforms and we also propose a new scheme for the tag structure equipped with the...
This paper presents a symbol synchronization algorithm in the multi-mode orthogonal frequency division multiplexing (OFDM) systems. Efficient system reconfiguration algorithm applying to the adaptive modulation and coding (AMC) method is also presented. The algorithm for the symbol synchronization uses the shorter repetition period for computing correlation values than existing methods. It can reduce...
Design of stacked circular patch antenna having the omni-directional in the azimuth plane has been proposed for very short range 60 GHz WPAN application. The proposed antenna uses LTCC technology, which makes easier to integrate with a transceiver chip.
In this paper, the effect of the Rician fading along the travel distance is studied, and practical measurement results are presented. Signal distortions have been can be detected as the travel distance between two antennas increases. The null points of an observed field are regarded as inter-symbol intersymbol interference from one RFID reader that will affect affects another neighboring RFID reader...
A CMOS common gate LNA with high linearity over UHF mobile RFID bands is presented. A common gate configuration applied to design the proposed LNA overall leads to high linearity and wide band characteristics. Proposed LNA is fabricated with 0.35 mum (one poly, four metals) CMOS manufacturing technology. The proposed LNA shows 3.2 dB noise figure, 13.4 dB voltage gain with 1.4 dBm P1 dB.
In this paper, digital LMR walky-talky was designed and fabricated for APCO P25 phase II. For linearization of RF transmitter, CFL ASIC was designed and implemented using 0.35 um CMOS process. Using CFL chip, the IMD characteristic of Tx PA was improved more 30 dBc when two-tone was injected and FCC emission mask was satisfied at 35.6 dBm output when modulated signal CQPSK was injected. Reference...
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