A Printed Log-Periodic Tree-Dipole Antenna (Plptda)

Lin, Sanbao; Luan, Shan; Wang, Yudie; Luo, Xiao; Xue, Hong; Zhang, Xingqi; Tian, Yu; Zhang, Xinyue

doi:10.2528/pierm11080109

Cited by 18 publications

(14 citation statements)

References 17 publications

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“…With the integration of the engineering with fractals geometries, it has been possible to describe the behavior of heat flow [22], as well as computational algorithms that have been developed for digital image processing [23]. Another clear example is in the area of telecommunications, with the development of antennas to improve wireless communication, increasing the bandwidth and improving the communication efficiency [24,25], similarly in the area of medicine, it has been used for the purpose of identifying the morphological structure of organs such as the kidney and the brain [26,27]. Similarly, postsurgical tissue recovery processes have been performed [28] and software development for medical image analysis [29].…”

Section: Methodsmentioning

confidence: 99%

Design of passive heat sinks to power semiconductor with the cesaro curve

Ruiz-Cardenas

Llano-Sánchez

Cajeli

et al. 2020

redin

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In the design of electronic circuits, stands out the power stage, which is responsible of increasing the signal characteristics, as current and voltage, for an appropriate performance of the device to fabricate. However, this stage is composed of elements like transistors, which may have a low performance, due to the undesired temperature increase, as a result of reaching the desired power. To mitigate the loss of power and with it, the temperature rise, the management of heat sink is proposed, in order to keep the work of the power stage at a stable level and avoid thermal fractures within the circuit. This manuscript presents the obtained results of the thermal analysis in finite elements of the heat sink with fins in the form of a Cesaro curve, for power semiconductors, which evidence the increase in the heat flow, with respect to the commercial ones and so, facilitate the heat evacuation for conditioning the voltage and/or current.

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Section: Methodsmentioning

confidence: 99%

Design of passive heat sinks to power semiconductor with the cesaro curve

Ruiz-Cardenas

Llano-Sánchez

Cajeli

et al. 2020

redin

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“…LPDA is UWB with the multiple resonance property; its bandwidth can be enhanced by increasing the number of the dipole elements [40][41][42]. Balanced structure, CPW fed antennas are very good candidates since the feed lines and the slots are on the same side of the substrate.…”

Section: Uwb Cpw-fed Lpda For Wireless Applicationsmentioning

confidence: 99%

Passive Components for Ultra-Wide Band (UWB) Applications

Elsheakh¹,

Abdallah²

2020

UWB Technology - Circuits and Systems

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UWB technology brings the convenience and mobility of wireless communications to very high-speed interconnects in the home and office due to the precision capabilities combined with the low power. This makes it ideal for certain radio frequency sensitive environments such as hospitals and healthcare as well as radars. UWB intrusion-detection radar is used for detecting through the wall and also used for security with fuse avoidance radar, precision locating and tracking (using distance measurements between radios), and precision time-of-arrival-based localization approaches. The FCC issued a ruling in 2002 that allowed intentional UWB emissions in the frequency range between 3.1 and 10.6 GHz, subject to certain restrictions for the emission power spectrum. Other definitions for ultra-wideband range of frequency are also used such as any device that has 500 MHz bandwidth or fractional bandwidth greater than 25% is considered an UWB enable high data rate to be transferred with a very low power that does not exceed À41.3 dBm. The main advantage of UWB technology is that it has the ability to transmit high bandwidth data between various devices with distances in the order of 10 m far from each other, such as home or office appliances with high sped transfer which may reach 1Gbit/s. There are many components that are designed and used in UWB systems such as antennas, power dividers/combiners, filters (LPF, BPF, etc.), rectennas, filtennas, etc. Many types of antennas are able to achieve UWB. Monopole antennas are usually used as linearly polarized antennas which prove to be the best whelming choice for use in various automobiles and mobile equipment. Log parodic and Yagi antennas are other types of UWB with high gain. Electromagnetic band gap (EBG) structure as defected ground or split ring resonator are also used to improve the antenna bandwidth and achieve UWB. Many UWB filters are designed and implemented using modern techniques such as meta-material, tuning stubs, defected ground structures, modified CMRC (compact microstrip resonant cell), etc. These filters may be switchable or tunable in order to make notch frequencies within the passband to provide interference immunity from unwanted radio signals, such as wireless local area networks (WLAN) and worldwide interoperability for microwave access (WiMAX) that cohabit within the UWB spectrum. The need of compact multiband filtenna (filter combined with antenna) with the ability of covering the current standards at the microwave band and the next generation standards at the millimeter wave band simultaneously is raising. Also, the operation of cognitive radio and self-adaptive systems need to dynamically monitor the frequency spectrum in search of the unused licensed channels. All these applications need different types of filtenna which may be fixed, switchable or tunable that can operate in the UWB range of frequency and also with narrow band modes to cover for example UWB/WiMAX applications.

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“…where X; W; N; and B s are scaling factor, spacing factor, the number of dipoles, and B s 5 B o 3B a , B o is the operating frequency, B a 5 1.1 1 30.7 W 12X ð Þ; respectively [27]. Log-periodic dipole array (LPDA) tends to have an upper cut off frequency dependent on the smaller arm dimension of the antenna, whereas the big matter are always the low frequencies, in theory limited by the biggest size of the antenna.…”

Section: Antenna Design and Geometrymentioning

confidence: 99%

Compact printed log‐periodic dipole antenna for water detection by using ground penetrating radar

Elsheakh

Abdallah

2014

Micro & Optical Tech Letters

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Compact printed fractal log-periodic dipole antenna (FLPDA) is proposed for water detection using ground penetrating radar (GPR). First fractal structure is introduced in an antenna design and evolves the traditional Euclidean log-periodic dipole array (LPDA). A fabricated proof-of-concept prototype of the proposed antenna is printed on a FR4 substrate with a relative permittivity of 4.7 on both substrate thickness 1.6 and 9.5 mm with occupied area of 85 3 110 and 60 3 70 cm 2 , respectively. The fabricated antenna has approximately 75% size reduction as compared to traditional LPDA. The 210dB impedance bandwidth extends from 45 MHz to more than 500 MHz. Both numerical and experimental results show that the FLPDA antenna has stable directional radiation patterns and apparently miniaturized effect, which are suitable for various ultrawideband applications. Main parameters and characteristics of the proposed antenna are discussed using both electromagnetic simulation and measurement. The effect of sandy soil, water layer, and the distance between sand and proposed antennas are also studied. Figure 11 Radiation pattern for thin substrate (solid line Eh, and dash line EA) at 50 MHz (a) XZ-plane, (b) XY-plane and at 500 MHz, (c) XZ-plane, and (d) XY-plane, respectively

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A Printed Log-Periodic Tree-Dipole Antenna (Plptda)

Cited by 18 publications

References 17 publications

Design of passive heat sinks to power semiconductor with the cesaro curve

Design of passive heat sinks to power semiconductor with the cesaro curve

Passive Components for Ultra-Wide Band (UWB) Applications

Compact printed log‐periodic dipole antenna for water detection by using ground penetrating radar

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