A compact planar multiband antenna operating at 2.65 (lower WiMAX)/5.20 (WLAN)/6.75/7.30 GHz (Satellite TV) is presented. The antenna consists of circular radiator in which a rectangular slot is etched out. Also, the circular radiator is loaded with a rectangular and two hook-shaped stubs to achieve multiband operations. The impedance matching at these bands is achieved by using two small square stubs placed inside the hook-shaped stubs. The antenna has an electrical dimension of 0.17λl x 0.17λl x 0.01λl at the lower frequency of 2.65 GHz. The antenna has S11<-10dB bandwidth of 3% (2.6-2.68GHz), 2.3% (5.12-5.24GHz), 1.2% (6.68-6.76GHz) and 1.37% (7.26-7.36GHz) in simulation and about 6.25% (2.48-2.64GHz), 2.24% (5.3-5.42GHz), 1.15% (6.92-7.00GHz) and 1.1% (8.04-8.12GHz) under measurement. The entire simulation analysis of the antenna is carried out using HFSS v.13.0.
This paper presents an auto-tuning-based driver for ultrasonic transducers aiming at cancer treatment through high intensity focused ultrasound (HIFU). The purpose of the proposed circuit is to offer higher energy conversion efficiency at the frequency of 1MHz. In addition, the proposed circuit is not only fully compatible with MRI equipment used to locate the cancerous tumor and monitor the temperature increase but also compatible with CMOS technology. The latter gives rise to the potential of the circuit to be integrated on chip. A PCB test circuit was designed with CMOS-based/compatible components. The experimental results performed on the implemented PCB card have confirmed the theoretical expectation. RÉSUMÉ :Cet article pré sente un circuit de pilotage basé sur l'auto-accord pour les transducteurs à ultrasons visant le traitement des cancers par ultrasons focalisé s à haute intensité (HIFU). Le but du circuit proposé est d'offrir une efficacité de conversion d'é nergie plus é levé e à la fré quence de 1 MHz. De plus, le circuit proposé est non seulement entiè rement compatible avec l'é quipement IRM utilisé pour localiser la tumeur cancé reuse et surveiller l'augmentation de tempé rature, mais é galement compatible avec la technologie CMOS. Cette derniè re donne naissance au potentiel d'inté gration du circuit sur puce. Un circuit de test PCB a é té conç u avec des composants CMOS / compatibles. Les ré sultats expé rimentaux ré alisé s sur la carte PCB implé menté e ont confirmé l'attente thé orique.
A compact (20 × 20 × 1.6 mm3) planar four band antenna operating at 1.35 (lower Global Navigation Satellite System [GNSS]), 2.57 (lower Worldwide Microwave Access [WiMAX]), 4.57 (C‐band) and for 5.13 GHz (Wireless Local Area Network [WLAN]) is presented. By utilizing slot method in the radiating patch and the ground plane the aforementioned operating bands are achieved. The antenna has a miniaturized dimension of 0.09λ0 × 0.09λ0 × 0.007λ0 (where λ0 is the free space wavelength at the lower frequency of 1.35 GHz, and exhibits good impedance match, acceptable radiation efficiency and stable radiation pattern at the targeted frequencies.
In this paper, the performance of Microstrip Patch Antenna (MSPA) is analyzed by changing the substrate materials. MSPA is designed to operate with the fixed dimensions of ????????×????????×????.???????????????? for three substrate materials. A comparison has been done in terms of reflection coefficient (S11), gain, efficiency (η), radiation pattern and cost. The simulated results show very good performance with TLC substrate as compared to FR4 and RT Duroid by showing good radiation efficiency for all the three bands viz 7.0, 9.6 and 10.8 GHz with the efficiency of 99%, 99% and 96% respectively, stable radiation patterns, gain of 1.32, 1.81 and 2.0 dB. FR-4 and RT Duroid produces two bands each of 8.4/ 9.6 GHz and 11.1/12.0 GHz respectively which shows a gain of 1.29/1.36 dB for FR4 and 1.04/7.95 dB for RT Duroid along with efficiency of 68%/ 60% and 96%/96% respectively with acceptable bandwidth. The Antenna is simulated using HFSS simulator solution software.
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