Showing papers on "Quarter-wave impedance transformer published in 2019"
TL;DR: In this article, a single stage broadband solid state power amplifier based on ATF13876 transistor, which operates in the frequency ranging from 1.25 GHz ǫ-3.3 GHz is presented.
Abstract: The research of a single stage broadband solid state power amplifier based on ATF13876 transistor, which operates in the frequency ranging from 1.25 GHz - 3.3 GHz is presented in this paper. To achieve the broadband performance of the operating bandwidth, a multi-section quarter wave impedance transformer and an approximate transformation of previously synthesized lumped elements into transmission lines are adopted. With neatly design of broadband matching networks and biasing circuit, excellent matching performances and unconditionally stability are achieved over the whole operating bandwidth with a maximum gain of 17.2 dB. The large signal simulation shows that the proposed circuit reaches a saturated output power of 18.12 dBm with a maximum PAE of 27.55% and a 1-dB compression point at 5 dBm input power level. Considering the wide frequency coverage, the features of the proposed design compares favorably with the contemporary state-of-the-art.
6 citations
01 Nov 2019
TL;DR: In this paper, a microstrip patch antenna with a quarter wave transformer for the ISM band was designed over the operating frequency is 2.4 GHz using the substrate material as FR-4, which can be used for ISM (industrial, scientific and medical) band applications in Wireless Body Area Networks (WBAN).
Abstract: This paper presents a design of microstrip patch antenna with quarter wave transformer for ISM Band. The antenna is designed over the operating frequency is 2.4 GHz using the substrate material as FR-4. The designed antenna can be used for ISM (industrial, scientific and medical) band applications in Wireless Body Area Networks (WBAN). Different performance parameters of the antenna such as operating frequency, Return Loss, Voltage Standing Wave Ratio (VSWR), directivity, SAR have been analyzed both in planar conditions on the human tissue model by using CST Microwave Studio. Finally, Specific Absorption Rate (SAR) is evaluated to satisfy the antenna safety concern on the human body.
3 citations
14 Oct 2019
TL;DR: In this article, a broadband microstrip antenna array matched with quarter wave microstrip line matching and Defected Ground Structure technical is proposed to achieve an antenna array for ka-band application.
Abstract: In this paper, a broadband microstrip antenna array matched with quarter wave microstrip line matching and Defected Ground Structure technical is proposed. The purpose of this paper is to use Defected Ground Structure (DGS) in microstrip antenna array to achieve an antenna array for ka-band application. The DGS position which is under the quarter wave line matching has an effect that has been presented in this paper. This work started with the single element antenna matched to a band [28–31.5] Ghz. After That, we have constructed and designed the antenna array in order to increase the gain and to obtain a radar antenna with high performances. The antenna array structure, fed by microstrip line and matched by quarter wave transformer, is printed on a Duroid 5880 substrate with dielectric constant of \(\epsilon _r\) = 2.22 and, tangent value 0.004 and 0.4 mm thickness. The simulations of this study are performed on CST Microwave Studio.
3 citations
01 Oct 2019
TL;DR: In this paper, a 1X4 patch antenna array for 5G communication was proposed, which was designed to resonate at 28GHz frequency band and achieved a maximum achievable gain of 13.5 dB.
Abstract: This research proposed a 1X4 patch antenna array for 5G Communication. The proposed antenna was designed to resonate at 28GHz frequency band. CST Microwave studio was used for the simulation of the antenna by employing Roger RT 5880 LZ with thickness and permittivity 0.762mm and 1.96 respectively as the substrate. The antenna was fed using a quarter-wave transformer to match its impedance to 50 ohms. The single patch resonates at 27.9GHz frequency with; a bandwidth of 1.87GHz, and a gain of 7.79dB. The addition of another element brought about an increment in the above-mentioned values. Furthermore, the implementation of the four element array configuration brought about the significant enhancement of values for bandwidth and antenna gain with maximum achievable gain of 13.5 dB. The design procedure, structure and simulation of the antenna are discussed in this paper.
1 citations
Patent•
16 May 2019
TL;DR: In this paper, a magnetic resonance (MR) endo-coil designed to operate at an MR frequency includes a coil section (20), an interface section (30), and a second electrical connector (34) that is configured to mate with the first electrical connector.
Abstract: A magnetic resonance (MR) endo-coil designed to operate at an MR frequency includes a coil section (20) and an interface section (30). The coil section includes a coaxial cable (22) having a proximal end (24) and a distal end (26), at least one MR receive coil loop (28) connected at the distal end of the coaxial cable, and a first electrical connector (32) disposed at the proximal end of the coaxial cable. The interface section (30) includes a preamplifier (50), an impedance matching circuit (40), and a second electrical connector (34) that is configured to mate with the first electrical connector. When connected, a quarter wave transformer (44) at the MR frequency is formed, comprising the coaxial cable of the coil section and the impedance matching circuit of the interface section. The quarter wave transformer electrically connects the at least one MR receive coil loop and the preamplifier.