Balun

About: Balun is a research topic. Over the lifetime, 5375 publications have been published within this topic receiving 52256 citations. The topic is also known as: Telephone balance unit.

A Study of Planar Printed Dipole Antennas for Wireless Communication Applications

Abstract: This paper presents the structure analysis, numerical design simulation, fabrication, and measurements of printed dipole-antennas for wireless communications. Two types of integrated microstrip balun, λ/4 open-stub and via-hole structures, are studied and compared. A developed finite-difference time-domain (FDTD) code and commercial Ansoft HFSS EM solver are used for design simulation and comparison. Design examples of 2.4- and 5-GHz printed dipole antennas with integrated balun are fabricated on an FR-4 printed-circuit-board (PCB) substrate. It is found that the 2. 4-GHz printed dipole with a via-hole balun has wider bandwidth (30%) than that with an open-stub balun (20% for VSWR < 2). The 5.7-GHz printed dipole with a via-hole balun has a bandwidth of approximately 20% (for VSWR < 2). The effect of the printed dipole length and arm-width on the antenna resonant central frequency and bandwidth has also been investigated. The measured antenna patterns are very close to that of an ideal dipole antenna for ...

A W-band current combined power amplifier with 14.8dBm P sat and 9.4% maximum PAE in 65nm CMOS

Abstract: We present a 101–117GHz power amplifier (PA) using two way current power combiner in 65nm bulk CMOS. It delivers up to 14.8dBm saturated output power with over 14dB power gain and better than 9.4% power added efficiency (PAE), which also achieves better than 11.6dBm output P 1dB . The PA features three stage transformer coupled differential architecture with integrated input and output baluns. To ensure the stability and improve efficiency, the PA first two stages adopt cascode structure and the last stage utilizes common source structure. A current power combiner is employed to combine the power from two separate PAs. The entire PA core occupies 0.106 mm2 chip area and dissipates about 200mW.

Chip type spiral broadside coupled directional couplers and baluns using low temperature co-fired ceramic

Abstract: Chip monolithic directional couplers and baluns have been gaining popularity due to the increasing demand of wireless telecommunication equipment. These multilayer components are meeting demands by allowing for smaller board space requirement, ease of surface mount assembly and their relative low cost. Spiral Broadside Coupled Striplines (SBCS) using Low Temperature Co-fired Ceramic (LTCC) are presented as a novel technique of fabricating the ultra-miniature chip directional couplers and the baluns. SBCS structure contributes dramatically to the reduction of the board space and the height compared with conventional Broadside Coupled Striplines (BCS). Electromagnetic principals, structures, electrical properties including scattering parameters (S-parameters) and power handling capabilities of the ultra-miniature chip directional couplers and the baluns utilizing SBCS structure are introduced. In addition, the rapid development and quality advantages of LTCC SBCS structures are discussed.

Design and performance of GaAs MMIC CPW baluns using overlaid and spiral couplers

Abstract: The design and performance of microwave and MM-wave baluns using multilayer GaAs MMIC technology is presented For MM-wave designs a compact overlaid coupler is employed For lower frequencies it is shown that novel spiral couplers can be used Results for baluns operating at 30-40 GHz and 5-15 GHz are presented

Wideband Filtering Balun on a Novel Hybrid Multimode Resonator With the Functionality of Vertical Transition

Abstract: In this paper, a novel hybrid multimode resonator (MMR) is proposed and applied for design and exploration of a wideband filtering balun with the functionality of vertical transition. This hybrid MMR consists of two distinctive kinds of transmission lines: 1) microstrip line placed at the top and bottom layers, and 2) slotline formed on the middle common ground. With this combination, a hybrid MMR is constituted not only to realize two wideband filtering baluns, but also to achieve wideband vertical transition function. By virtue of the field conversion from the slotline to the output coupled $\lambda $ /2 microstrip line resonator, the 180 out-of-phase and equal magnitudes at the balun’s outputs can be achieved inherently over a wide frequency range. Meanwhile, multiresonant modes can be excited by properly setting a certain offset distance at the two feeding points in the hybrid MMR. As such, good signal transmission and wideband filter performances between the top-and bottom-layer microstrip lines can be gained over a desired wideband frequency range, and they can be determined by proper reallocation of these resonant modes. As examples, two prototype circuits are designed and fabricated to confirm the proposed concept. Furthermore, both simulated and measured results indicate that this proposed balun filter exhibits not only a high-selectivity filtering performance, but also good phase and magnitude imbalance performance in the wide operating band with the functionality of vertical transition.