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Showing 1 to 20 of 27 for “"Balun"”.
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Design, fabrication, and characterization of a wideband microwave balun
A wideband microwave balun is designed to adapt unbalanced to balanced transmission line networks. The balun is realized by a planar microstrip line configuration on a double copper c1added teflon-ceramic C0I11posite board. The microstrip line conductor pattern was formed on the board using the …
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Linearized 4-7 GHz LC Tunable Filter with Active Balun in 0.18um SiGe BiCMOS
… the microwave regime. A balanced-to-unbalanced (balun) transformation circuit is required to support the differential nature of a tunable LC filter. An active balun that also performs as a transconductor to drive the LC tank would relax the design requirement for the LNA and remove a passive …
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An investigation of series LC resonant circuits within a sleeve balun to achieve wideband operation
… antenna directly to the coaxial cable feed. A balun is required to prevent surface current from flowing onto the outer shield of the feed cable. Balun chokes like the sleeve balun, also known as bazooka balun or quarter-wavelength balun, are commonly used in antenna measurements. In general, …
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Through the Eyes of Shamans: Childhood and the Construction of Identity in Rosario Castellanos' "Balun-Canan" and Rudolfo Anaya's "Bless Me, Ultima"
<p>This study offers a comparative analysis of Rosario Castellanos' <em>Balún-Canán</em> and Rudolfo Anaya's <em>Bless Me, Ultima,</em> novels that provide examples on how children construct their identity in hybrid communities in southeastern Mexico and the U.S. southwest. The protagonists grow …
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Synthesis, design, and fabrication techniques for reconfigurable microwave and millimeter-wave filters
… of fully-balanced and balanced-to-unbalanced (balun) filters. An octave-tunable 3-pole bandpass balun filter using this coupling structure is presented. The balun filter has excellent amplitude and phase balance, resulting in common-mode rejection of greater than 40 dB across its octave tuning …
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Development of harmonic suppressed reconfigurable fractal dipole antenna
… that is integrated with the stubs and tapered balun has been designed and tested in this study. The Koch dipoles are double-sided structure while the tapered balun is triangular. Initial design is based on a 0.9GHz linear half-wavelength dipole. The Koch dipole antenna has equal arm lengths of …
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Mutual Coupling Reduction Techniques for Multi-band Base Station Antennas
… the proposed LB dipole, the baseline MB dipole balun feed stems exhibit induced common mode currents, which radiate as electrically short monopoles over a conducting ground plane, that degrade the LB radiation characteristics. These currents are suppressed by integrating parallel plate series …
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Design and integration techniques for compact, wideband and multi-functional baluns
… the ever-more crowded frequency spectrum. RF baluns, being a key front-end passive component in RF communications must meet these requirements, while effectively providing an impedance transformation and converting balanced-to-unbalanced RF signals. However, current balun technologies are …
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Advanced Downconversion Mixers for CMOS Radio Frequency Integrated Circuits
… Gilbert-cell-based mixer with an on-chip balun is also presented. The mixer adopts a folded structure with its transconductor and the switching stages coupled with an on-chip, multifilament-transformer-based balun. With this balun integrated, the single-ended-to-differential conversion is …
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Design of Low Power Integrated Radios
… of Things (IoT) is presented which uses 1:3 balun at the frontend to achieve mutual noise and non-linearity cancellation as well as power reduction. In this technique the mutual coupling between the two secondary coils of the balun enable noise and non-linearity cancellation of both the main …
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Time domain metrology for dielectric spectroscopy of particulates
… domain measurements. A scheme using a twin lead balun driven ground probe was proposed and analysed with regard to accuracy and sensitivity to measurement error.
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Archimedean spiral antenna embedded with frequency selective surface for wideband applications
… improvement. Microstrip to parallel strip line balun is proposed as the feeding structure of the spiral antenna. This balun has very large bandwidth ranging from 2 GHz to 14 GHz. However, the separation of the ground plane and the spiral arms at quarter wavelength at lower frequencies …
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Analysis, design, and fabrication of Archimedean spiral antennas
… an Archimedean spiral and a necessary wideband balun transformer feed structure are presented. To aid in the design, the Electromagnetic Surface Patch Code (ESP) developed by Ohio State University is used. The spiral and feed structure are constructed and measured results are compared to …
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GPR propagation simulation and fat dipole antenna design
… terminating resistance. antenna impedance and balun matching. After the design process was completed, fabrication of the antenna took place and the design validated.
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Antenna systems research
… Terminal Antennas, - Transmission lines and baluns, - High Radar Cross Section Reflectors for Spaceborne Radar Calibration, - Miscellaneous Antenna Investigations. These investigations have resulted in various outcomes: in new antenna types and in improved antenna configurations; in improved …
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Electrical Design and Testing of an Uplink Antenna for Nanosatellite Applications
… antenna. A gamma match and a quarter-wave sleeve balun transformer were integrated to the system to minimize the power reflected at the antenna input and to isolate the antenna from the feed line. The uplink antenna demonstrated sufficient performance; however, the final bandwidth of less than one …
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CMOS bulk-driven mixers with passive baluns
… down-conversion mixers with on-chip transformer baluns in 0.18 μm CMOS is presented. Applying either the RF signal or the local oscillator (LO) signal to the bulk connection of the transistors allows the amplification and switching stages of a conventional mixer to be combined into a single …
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