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.
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Patent•
16 Mar 2010
TL;DR: In this article, an apparatus for transmitting and receiving wireless communications is provided, which includes a first inductor including a first set of ports coupled to the antenna and a second inductor coupled to a power amplifier through a first circuit.
Abstract: In one embodiment, an apparatus for transmitting and receiving wireless communications is provided. A balun is coupled to an antenna. The antenna transmits and receives radio frequency signals. The balun includes a first inductor including a first set of ports coupled to the antenna. The balun includes a second inductor with a second set of ports coupled to a power amplifier through a first circuit. The power amplifier transmits a first signal to the antenna. The balun also includes a third inductor with a third set of ports coupled to a low noise amplifier through a second circuit. The low noise amplifier receives a second signal from the antenna. The second set of ports is coupled to the first circuit and the third set of ports is coupled to the second circuit. Also, the first circuit is separate from the second circuit.
16 citations
Patent•
24 Jun 2015
TL;DR: In this paper, a planar-broadband dual-polarization base station antenna is proposed to solve the problems that an existing BS antenna is complex in structure and has difficulty in being integrated with other devices.
Abstract: The invention discloses a planar-broadband dual-polarization base station antenna and belongs to the field of mobile communication base station antennae. The planar-broadband dual-polarization base station antenna mainly solves the problems that an existing base station antenna is complex in structure and has difficulty in being integrated with other devices. The planar-broadband dual-polarization base station antenna comprises radiation oscillators (1), feed baluns (2), a baffle board (3), coaxial cables (4), supporting columns (5) and a dielectric material plate (6). The radiation oscillators (1) are dual-polarization planar oscillators at +/-45 degrees, and the feed baluns (2) are planar feed baluns at +/-45 degrees. The radiation oscillator at -45 degrees and the feed balun at +45 degrees are printed on the upper surface of the dielectric material plate (6), and the radiation oscillator at +45 degrees and the feed balun at -45 degrees are printed on the lower surface of the dielectric material plate (6). The dielectric material plate (6) is fixed to the square baffle board (3) through the supporting columns (5). According to the planar-broadband dual-polarization base station antenna, planarization of the radiation oscillators and the feed baluns are achieved, meanwhile, the structure of the baffle board is simplified, and a stable directional diagram characteristic can be obtained in broadband.
16 citations
TL;DR: In this article, a design method and a lumped model for a circular spiral transmission-line balun is presented, where the model captures all important properties of the balun with reasonably high accuracy.
Abstract: We describe a design method and lumped model for a circular spiral transmission-line balun. All lumped values are extracted from the geometric parameters of the balun. From simulation, the design parameters with well predicted characteristics are defined. The balun is fabricated using multi-chip module processing technology, which is suitable for integration in RF packages. Measurements show a wide bandwidth of 1.5-4.1 GHz and excellent balanced outputs. Amplitude imbalance less than 0.5 dB and phase imbalance less than 4/spl deg/ are achieved. The simulation results are compared with the measurement. The model captures all important properties of the balun with reasonably high accuracy.
16 citations
01 Oct 2003
TL;DR: In this article, a branch-line coupler, a rat-race coupler and an all-ports matched planar Marchand balun are designed at the center frequency of 38 GHz.
Abstract: In this paper, miniature hybrid couplers and baluns using 3D-MMIC technology are presented. These circuits include a branch-line coupler, a rat-race coupler and an "all-ports matched" planar Marchand balun, all designed at the center frequency of 38 GHz. They are fabricated using a multilayer MMIC process employing five metal layers and four layers of BCB dielectric film on a GaAs substrate. With this, size reduction as much as 6 times over their standard counterparts has been achieved and they are thus suitable for the implementations of compact circuits such as balanced mixers and amplifiers.
16 citations
01 Dec 2004
TL;DR: In this article, an ultra wideband patch antenna is presented in which the moment method is used to analyse and optimise a patch antenna, the final optimised patch antenna looking like a cobra snake.
Abstract: An ultra wideband patch antenna is presented in which the moment method is used to analyse and optimise a patch antenna, the final optimised patch antenna looking like a cobra snake. It is therefore referred to as ‘cobra patch antenna’. The antenna has an ultra wideband VSWR performance and relatively good gain, no input balun, and is easy and cheap to manufacture. It could be useful in wireless communication, and in EMC and antenna measurements.
16 citations