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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
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Journal ArticleDOI
TL;DR: In this paper, the authors proposed a scheme based on the characteristics of leaky-wave antennas for the empirical design of broadband tapered microstrip leakywave antennas, which can explain and approximately model the radiation characteristics of a linearly tapered antenna.
Abstract: This study proposes a novel scheme based on the characteristics of leaky-wave antennas for the empirical design of broadband tapered microstrip leaky-wave antennas. This scheme can explain and approximately model the radiation characteristics of a linearly tapered leaky-wave microstrip antenna. A broadband feeding structure that uses the balanced and the inverted balanced microstrip lines to form a pair of broadband baluns is also presented. The measured return loss of the inverted balanced microstrip lines has a VSWR/spl les/2 from dc to 18.6 GHz and that of the back-to-back feeding structures has a VSWR/spl les/2 from 2.2 to 18.6 GHz. This feeding structure can be used to feed a broadband planar leaky-wave antenna with a fixed mainbeam that uses the tapered microstrip structure. The measured bandwidth of the antenna for a VSWR/spl les/2 exceeds 2.3:1.

92 citations

Journal ArticleDOI
TL;DR: In this article, a pair of 180-degree broadband microstrip balun pairs were used to feed a dual-polarized patch antenna for a quadruple L-probe square patch antenna.
Abstract: A pair of novel 180deg broadband microstrip baluns are used to feed a dual-polarized patch antenna. The 180deg broadband balun delivers equal amplitude power division and consistent 180deg (plusmn5deg) phase shifting over a wide bandwidth (>50%). We demonstrate that for a dual-polarized quadruple L-probe square patch antenna, the use of the proposed 180deg broadband balun pair, in place of a conventional 180deg narrowband balun pair, provides improved input port isolation and reduced H-plane cross-polarization levels over a wider frequency range, while maintaining low E-plane cross-polarization levels and stable E- and H-plane co-polarization patterns throughout the impedance passband

90 citations

Patent
Roland A. Gilbert1
15 Mar 2001
TL;DR: In this article, a reconfigurable diplexer is proposed for use with mulitple element antenna arrays, which can operate in several different bands such as the INTELSAT frequencies (7.2-8.4 GHz) or DSCS frequencies (11.7-14.5 GHz).
Abstract: The present invention provides a reconfigurable diplexer which is well suited for use with mulitple element antenna arrays. The diplexer includes a common, slot-line transmission line adapted to carry electromagnetic signals; a pair a separate slot-line transmission lines coupled to the common transmission line; each separate slot-line transmission line having an individual filter coupled thereto, wherein each filter is adapted to selectively give its respective separate slot-line transmission line a characteristic impedance dependent upon predetermined frequencies of the electromagnetic signals; and a separate slot-line balun associated with each separate slot-line transmission line and adapted for coupling signals to and/or from its respective separate slot-line transmission line. The diplexer may be configured to operate in several different bands such as the INTELSAT frequencies (7.2-8.4 GHz) or DSCS frequencies (11.7-14.5 GHz).

90 citations

Journal ArticleDOI
TL;DR: In this paper, a resistively loaded vee dipole (RVD) is designed and implemented for ultrawide-band short-pulse ground-penetrating radar (GPR) applications.
Abstract: A new resistively loaded vee dipole (RVD) is designed and implemented for ultrawide-band short-pulse ground-penetrating radar (GPR) applications. The new RVD is improved in terms of voltage standing wave ratio, gain, and front-to-back ratio while maintaining many advantages of the typical RVD, such as the ability to radiate a short-pulse into a small spot on the ground, a low radar cross section, applicability in an array, etc. The improvements are achieved by curving the arms and modifying the Wu-King loading profile. The curve and the loading profile are designed to decrease the reflection at the drive point of the antenna while increasing the forward gain. The new RVD is manufactured by printing the curved arms on a thin Kapton film and loading them with chip resistors, which approximate the continuous loading profile. The number of resistors is chosen such that the resonant frequency due to the resistor spacing occurs at a frequency higher than the operation bandwidth. The antenna and balun are made in a module by sandwiching them between two blocks of polystyrene foam, attaching a plastic support, and encasing the foam blocks in heat-sealable plastic. The antenna module is mechanically reliable without significant performance degradation. The use of the new RVD module in a GPR system is also demonstrated with an experiment.

90 citations

Journal ArticleDOI
TL;DR: A planar monolithic diode mixer that achieves 5-10dB conversion loss and very low distortion and spurious responses over a 26-40GHz RF and local oscillator (LO) bandwidth and DC-12-GHz IF is described in this paper.
Abstract: A planar monolithic diode mixer that achieves 5-10-dB conversion loss and very low distortion and spurious responses over a 26-40-GHz RF and local oscillator (LO) bandwidth and DC-12-GHz IF is described. Two types of diodes have been used: the first used the gate-to-channel junctions of 0.2- mu m*80- mu m InGaAs HEMTs; and the second used Schottky diodes realized in HBT technology. The baluns are Marchand-like coplanar structures. >

90 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202361
2022242
2021130
2020280
2019327
2018310