scispace - formally typeset
Search or ask a question
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
More filters
Journal ArticleDOI
TL;DR: In this article, a low-profile microstrip antenna that has a broad impedance bandwidth by exciting three resonant modes is proposed, which mainly consists of a grid-slotted radiation patch, a metal ground, four vertical metal strips, and a vertical grounded balun feeding structure.
Abstract: A low-profile microstrip antenna that has a broad impedance bandwidth by exciting three resonant modes is proposed. The proposed antenna mainly consists of a grid-slotted radiation patch, a metal ground, four vertical metal strips, and a vertical grounded balun feeding structure. The TM10, TM12, and antiphase TM22 modes are excited simultaneously. The vertical grounded balun feeding structure is used to avoid etching slot on the metal ground to get a high front-to-back ratio. The four vertical metal strips are introduced to enhance the impedance matching and reduce the sidelobe of the radiation pattern of the antiphase TM22 mode. With a profile of 0.07 λ 0 ( λ 0 is the center operating wavelength in the free space), the measured −15 dB impedance operating band is 3.31–4.31 GHz, and the relative bandwidth is 26.2%. The measured front-to-back ratio is larger than 16 dB, and the sidelobe level is lower than −10 dB. The proposed antenna has a stable broadside radiation performance in the operating band.

25 citations

Journal ArticleDOI
TL;DR: In this paper, the design and fabrication of ultra-wideband (UWB) baluns embedded in multilayer liquid crystal polymer (LCP) flex is presented, which are ideal for applications in UWB communication systems specified by the IEEE 802.15.3a standard.
Abstract: In this paper, we present the design and fabrication of ultra-wideband (UWB) baluns embedded in multilayer liquid crystal polymer (LCP) flex. Fabrication techniques are demonstrated for processing these commercially available LCP thin-films by standard PCB equipments. Variations in the LCP thin-film thickness are characterized and compared before and after lamination. Results show good dimensional stability of the material, a critical factor in controlling the line impedances and performance of the balun. Electrical results of these baluns show bandwidths exceeding 3.1-10.6 GHz with less than 1 dB insertion loss, and amplitude and phase imbalance less than 1.2 dB and 2deg, respectively. These baluns are ideal for applications in UWB communication systems specified by the IEEE 802.15.3a standard.

25 citations

Proceedings ArticleDOI
20 Oct 1991
TL;DR: In this article, a reduced-size branch line hybrid circuit and a rat-race circuit are successfully applied to a small size K-band balanced up-converter and an image-rejection up-consverter.
Abstract: A reduced-size branch-line hybrid circuit and a rat-race circuit, both of which were designed on an uniplanar approach, are successfully applied to a small size K-band balanced up-converter and an image-rejection up-converter. These two circuits utilize a combination of high-impedance transmission lines and lumped-constant capacitors. The image-rejection up-converter also employs a lumped-element balun and a lumped-element Wilkinson combiner. The use of these four circuit greatly reduced the size of the up-converter chips. The fabricated up-converter showed good performance including conversion gain of 1.7 dB and image-rejection of more than 20 dB at the K-band. >

25 citations

Patent
22 May 2009
TL;DR: In this article, a transformer converts a single input signal to a differential input signal using a first tap, and a notch filter blocks a specific frequency band by connecting a second tap with the first tap using a condenser.
Abstract: Provided are a receiving circuit including a balun circuit and a notch filter, and an operating method thereof. The receiving circuit includes a transformer, a notch filter, and a mixer. The transformer converts a single input signal to a differential input signal using a first tap. The notch filter blocks a specific frequency band of the single input signal by connecting a second tap with the first tap of the transformer using a condenser.

25 citations

Journal ArticleDOI
TL;DR: Good matching between simulated and measured results shows the accuracy of the proposed design and methodology, which would be attractive in the high-power radio frequency (RF) front-end systems.
Abstract: In this paper, a series of designs for cavity balanced and unbalanced diplexer are proposed. The balanced and unbalanced designs can be categorized into four groups—unbalanced-to-unbalanced, unbalanced-to-balanced, balanced-to-unbalanced (B2U), and balanced-to-balanced. First, two approaches to achieve out-of-phase characteristics of three fundamental modes, namely TE011, TE101, and TM110 in a single triple-mode resonator, are proposed for balun filter designs. Second, four types of unbalanced and balanced diplexers are presented by adopting these three fundamental modes, of which the Butterworth response applies with specific external quality and coupling coefficient. To the authors’ best knowledge, full-metal cavity balun diplexer and balanced diplexer are not reported in the open literature. For proof of concept, the design of a B2U diplexer is fabricated and measured. Good matching between simulated and measured results shows the accuracy of the proposed design and methodology, which would be attractive in the high-power radio frequency (RF) front-end systems.

25 citations


Network Information
Related Topics (5)
Microstrip antenna
43.9K papers, 604.4K citations
89% related
Antenna (radio)
208K papers, 1.8M citations
89% related
Amplifier
163.9K papers, 1.3M citations
81% related
Bandwidth (signal processing)
48.5K papers, 600.7K citations
80% related
CMOS
81.3K papers, 1.1M citations
80% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202361
2022242
2021130
2020280
2019327
2018310