1,356,073 research outputs found
SiGe process integrated on-chip dipole antenna on finite size ground plane
No full textThis letter investigates the effect of a finite-size ground plane on the radiation pattern and reflection coefficient of a SiGe process integrated on-chip antenna. A flat 77-GHz on-chip strip dipole antenna integrated with a lumped balun circuit is designed and implemented. For increased directivity, the etched silicon substrate is placed on a metal ground plate. The on-chip antenna with the balun circuit is connected to GSG pads for measurement purposes. The antenna is well matched at the original resonance frequency band with 7-12 GHz impedance bandwidth and 4 dBi measured gain at 85 GHz
Design of Multiband Balanced Folded Dipole Antenna Based on a Dual-Arm Structure for Mobile Handsets
No full textYesIn this paper, a balanced antenna for mobile handset applications with enhanced
bandwidth performance, that covers four bands (GSM1800, GSM1900, UMTS and 2.4-GHz
WLAN), is investigated. The antenna is a slot planar dipole with folded structure and a dual-arm on each monopole. A wide bandwidth planar balun is employed to feed the wideband balanced antenna from an unbalanced source. A prototype of the proposed antenna is fabricated and
tested. The performance of the antenna is veri¯ed and characterized in terms of return loss, radiation patterns and power gain. The calculated and measured results show good agreement and also con¯rm good wideband characteristics for the proposed antenna with multiband operation
A compact and broadband balun design for LTE applications
No full textIn this paper, a compact wideband planar balun is studied and investigated. The proposed balun comprises a broadband Wilkinson divider followed by non-coupled lines to attain wideband 180° phase shift. Due to the inherent broadband characteristics of the proposed structure, good performance is accomplished in terms of phase and amplitude balance. The balun is optimally designed and validated by experiments. Both measured and computed results have shown a return loss better than -10 dB, an insertion loss around of -3.15 dB with a maximum absolute phase and amplitude imbalance around 2.5° and 0.2 dB over frequency range from 700 to 3200 MHz. Practical and computed results of the present balun are in good agreement
Design of controlled RF switch for beam steering antenna array
No full textYesA printed dipole antenna integrated with a duplex RF switch used for mobile base
station antenna beam steering is presented. A coplanar waveguide to coplanar strip transition was adopted to feed the printed dipole. A novel RF switch circuit, used to control the RF signal fed to the dipole antenna and placed directly before the dipole, was proposed. Simulated and
measured data for the CWP-to-CPS balun as well as the measured performance of the RF switch are shown. It has demonstrated the switch capability to control the beam in the design of beam steering antenna array for mobile base station applications
Microstrip to parallel strip balun as spiral antenna\ud feed
No full textThis paper presents the design and implementation of a microstrip to parallel strip balun which are frequently used as balanced antennas feed. This wideband balun transition is composed of a parallel strip which is connected to the spiral antenna and a microstrip line where the width of the ground plane is gradually reduced to eventually resemble the parallel strip. The taper accomplishes the mode and impedance transformation. This balun has significantly improved bandwidth characteristics.\ud
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The entire circuit was fabricated on RT Duriod 5880 substrate. The circuit designs were simulated and optimised using CST Microwave Studio and the simulated results are compared with the measured results. The back-to-back microstrip to parallel strip has a return loss of better than 10 dB over a wide bandwidth from 1.75 to 15 GHz. The performance of the proposed balun was validated with the spiral antenna. The measured results were compared with the simulated results and it shows that the antenna operates well in wideband frequency range from 2.5 to 15 GHz
Active Balun Design for Next-Generation Telecom Satellite Frequency Converters
No full textIn this work, we describe the complete design flow of a 1.3–3.3-GHz active balun, exploited to generate a high-voltage swing differential local oscillator (LO) signal driving a highly linear doubly balanced resistive ring mixer. Both the LO active balun and the mixer are integrated into a Ku-band single chip monolithic microwave integrated circuits (MMIC) downconverter for the state-of-the-art telecom satellites. System performance has been maximized designing the different circuits by a holistic approach, which considers a non 50- environment. The experimental validation is carried out by means of an ad hoc time-domain load–pull test bench and shows that the LO active balun provides two quasi-sinusoidal, 180 out-phased, signals with 2.4-V peak-to-peak voltage to the input ports of the mixer over a very high-impedance loading condition
Analysis of the Textual and Musical Meaning of the Songs Ketabo – Ketabo, Siboru Enggan, Balun – Balun Bide in the Mandaling – Angkola Community in South Tapanuli Regency
No full textThis research paper aims to discuss the Analysis of Textual Meaning and Musical Structure in the songs Ketabo – ketabo, Siboru enggan, and Balun – balun Bide, within the Mandailing – Angkola community in South Tapanuli. The research techniques used by the author are field work and desk work, as proposed by Bruno Netll. The author uses a qualitative method by conducting observations, interviews, and audio and video recordings. To analyze the textual meaning contained in the song, the author uses Ferdinand De Saussure's semiotic theory regarding denotative and connotative meanings, or figurative and literal meanings. To obtain the results of the Musical Structure Analysis, the author uses Bruno Netll's theory to describe the musical content found in those songs, namely, the scale, tempo, phrase of the melodic contour, intervals, and range. Research findings reveal that the songs "Ketabo – ketabo," "Siboru enggan," and "Balun – balun bide" tell stories about the beauty of nature, togetherness, and journeys.107 PagesSkripsi Sarjan
Optimized Wideband Impedance Matching Balun for Conducting Two-Arm Antennas
No full textA split coaxial balun with a step transition of the inner conductor diameter is introduced to satisfy impedance matching between unbalanced feeder and balanced antennas. The location of the step transition along the axis of the balun and the diameter change are two dimensional parameters that are not present in the conventional split coaxial balun. These additional parameters, together with the double slot width, provide more flexibility to design the balun for better impedance matching. The effects of the three dimensional parameters on the input impedance seen at the (unbalanced) coaxial line side of the balun are investigated when it is terminated with specific lumped impedance at its (balanced) split side. An optimization procedure is introduced to arrive at the balun dimensional parameters to give the best matching with specific load impedance. The proposed balun is designed to feed (balanced) two-arm antennas such as the dipole and the bowtie antenna from 50 Ω-coaxial line. The electromagnetic simulation shows that the proposed balun results in a perfect impedance matching. A comparison with the performance of the conventional split balun used to feed a dipole antenna shows that the balun proposed in the present paper gives a much lower value of the return loss at the design frequency and a wider bandwidth for VSWR ≤ 1.5. The simulation results obtained using the MoM are compared with experimental measurements showing good agreement
Design, fabrication, and characterization of a wideband microwave balun
No full textA wideband microwave balun is designed to adapt unbalanced to balanced transmission line networks. The balun is realized by a planar microstrip line configuration on a double copper c1added teflon-ceramic C0I11posite board. The microstrip line conductor pattern was formed on the board using the chemical etching process. The fabricated balun is measured and evaluated in both the time domain and frequency domain, indicating a 5 GHz bandwidth. The time domain modeling technique is used to characterize the balun's performance. Based on physical analysis of the balun's configuration, the discontinuities through the transmission paths are modeled as distributed and lumped elements, resulting in an equivalent network model for the balun structure. The obtained model successfully simulates the balun's performance.Master of Scienc
Printed microwave wideband passive balun
No full textBalun is an important component in a wireless communication system, particularly in a microwave circuit. Its ability to accept an unbalanced input and produce balanced output makes it applicable in various wireless communication application. In this thesis, balun is used as a transformer and an impedance match for a wideband application. Planar balun is chosen over other types of balun because it has some good qualities such as low insertion loss and wide bandwidth. Coplanar waveguide and coplanar strip lines are used to design the balun. The balun transform the unbalanced CPW feed line to balanced CPS feed line. The baluns are design to operate at centre frequency of 3 GHZ. The impedance match between the cable and the balun is obtained using Chebyshev and Binomial multisection impedance transformer. An analysis using MathCAD of balun performance using the two impedance matching theories for three, four and five sections transformers are made. Results show that Chebyshev response has wider wideband bandwidth compare to Binomial response and the more the number of sections, the larger the bandwidth. The wideband transition from CPW to CPS is accomplished through slots in between the two structures. A rectangular slot is introduced to compare the results with other types of slot found in the literature review. The balun is intended to be used for spiral antenna
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