Topic
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.
Papers published on a yearly basis
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TL;DR: The optimized design of planar balun circuits which operate in the 900 MHz wireless frequency band are described which are an outgrowth of extensive in-depth computer analysis and fabrication and testing of a multiplicity of circuit realizations.
Abstract: The high frequency balun network has proven to be an important component in the design of certain RF and microwave system topologies-especially in wireless communications system architectures. This work describes the optimized design of planar balun circuits which operate in the 900 MHz wireless frequency band. The designs are an outgrowth of extensive in-depth computer analysis and fabrication and testing of a multiplicity of circuit realizations. A novel feature of these designs is their compact size which is almost one sixteenth that of conventional quarter wavelength-coupled line designs. Size reduction and excellent coupling are effectively obtained by novel use of discrete capacitors.
19 citations
21 Aug 2006
TL;DR: In this article, a new model was proposed to speed up the design of a printed dipole and its feeding balun, where the optimised parameters influence only the model elements that are characterised in closed-form, whereby the field simulation workload is minimised.
Abstract: A new model speeds up the design of a printed dipole and its feeding balun. The optimised parameters influence only the model elements that are characterised in closed-form, whereby the field simulation workload is minimised. The predicted performance of two experimental antennas agrees well with the measurements.
19 citations
17 May 2015
TL;DR: A push-pull Doherty Power Amplifier (DPA) is proposed that uses a wideband power combiner BALUN, which is capable to provide the optimum fundamental and 2nd harmonic loading conditions over a large operating bandwidth to the active devices.
Abstract: A push-pull Doherty Power Amplifier (DPA) is proposed that uses a wideband power combiner BALUN, which is capable to provide the optimum fundamental and 2nd harmonic loading conditions over a large operating bandwidth to the active devices. A 700W DPA demonstrator using these techniques provides high average efficiency (> 40%) for a 7.5dB PAR DVB-T signal over a 37% relative RF-bandwidth.
19 citations
TL;DR: In this article, a switchless dual-band, dual-mode power amplifier (PA) has been developed for multioctave operation, which operates as a balun at highband frequencies and the coupled line at low-band frequencies.
Abstract: In this paper, a switchless dual-band, dual-mode power amplifier (PA) has been developed for multioctave operation. For the switchless dual-band operation, we proposed a new coupled-line-based diplexer structure. The proposed diplexer operates as a balun at high-band frequencies and the coupled line at low-band frequencies. To better understand the proposed diplexer structure, a detailed analysis is performed based on a coupled-line theory. The interstage and output-stage matching networks of the PA are designed by using the proposed diplexer. To maximize the power-added efficiency (PAE) of the designed PA, turn off the unused band PAs and decide the optimum off-state bias condition of transistors. The designed dual-band, dual-mode PA is fabricated with commercial 0.25- $\mu \text{m}$ GaN HEMT process. The fabricated PA shows over 15-dB small-signal gain at 5–11 GHz in the low-band mode and 9–18 GHz in the high-band mode. The measured average output power and PAE are 35 dBm, 23% in the low-band mode and 37 dBm, 26% in the high-band mode.
19 citations
Patent•
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TL;DR: In this article, an active balun device is proposed, which includes a differential input portion for receiving an external single input signal to output two complementary differential signals; and a differential amplifier connected to the differential input component in cascade to amplify the two differential signals received from the differential inputs.
Abstract: An active balun device is provided. The active balun device includes: a differential input portion for receiving an external single input signal to output two complementary differential signals; and a differential amplifier connected to the differential input portion in cascade to amplify the two differential signals received from the differential input portion. Thus, the active balun device has a sufficient gain and a desired bandwidth in a semiconductor circuit.
19 citations