Chi-Fang Huang

A WLAN-used helical antenna fully integrated with the PCMCIA carrier

The invention presented here is to embed the helical antenna inside an ejector of a Personal Computer Memory Card International Association (PCMCIA) carrier. The detail dimension of this antenna has been well designed to operate at the frequency 2.45 GHz, which is employed for the wireless LAN application. A low-cost electromagnetic simulation package-WIPL-D, is used to simulate this complex electromagnetic environment where the carrier metal is modeled as well, in addition to the helical antenna itself. Measurements both of return loss and radiation patterns are made too to have a comparison with the results of simulation and to prove the design thoughts given by this paper. As a final evaluation, a PCMCIA carrier with the present design is installed into a Tablet PC to have a complete measurement.

Electromagnetic thermotherapy using fine needles for hepatoma treatment

BACKGROUND AND AIMS Hepatocellular carcinoma can be treated with heat-based therapies, especially radiofrequency ablation (RFA). However, RFA has limited efficacy and is quite expensive. We designed a new system using fine needles combined with an alternating magnetic field to generate hyperthermia for the treatment of hepatocellular carcinoma in a rat hepatoma model. Our aims are to assess the efficacy of our method and determine survival up to 30 days. METHODS An N1-S1 cell line was inoculated into the livers of Sprague-Dawley rats, generating tumors after 14 days. The animals were randomized into 5 groups and treated after laparotomy either with normal saline (group I), iron oxide nanoparticles (group II), fine needles (group III), fine needles and iron oxide nanoparticles combined (group IV) or self-designed two-part needles placed under ultrasonographic guidance percutaneously (group V). Every rat was placed in an alternating magnetic field. The temperature in the treatment area was maintained between 55 and 60 °C. At day 30 after treatment, tumor volumes and mortality were assessed and histology samples were studied. RESULTS Tumor volumes were significantly reduced and survival rate was prolonged in groups III, IV and V versus groups I and II (P < 0.05). On pathological examination, groups III, IV and V presented obvious necrosis, apoptosis, calcifications and inflammatory changes in the treatment area. CONCLUSION Our study demonstrates that hyperthermia generated by fine stainless-steel needles combined with an alternating magnetic field effectively inhibits hepatoma growth in rats and prolongs their survival. Further, this method can be applied percutaneously under ultrasonographic guidance.

A warning system based on the RFID technology for running-out of injection fluid

For providing an automatic warning system of running-out of injection fluid, RFID technology is applied in this work to propose an infrastructure with low cost to help nurses and patients company. Specially, a RFID tag is designed and attached on a bag of intravenous drip to demonstrate the benefits in the present system. The main idea of this system is that, tag is disabled when the bag is not empty because of the EM loading due to the liquid contained. The bag can be any kind in the current market and be without any electronic attachment or modification. LAN (Local Area Network) is also applied as a part of this infrastructure for data transmission.

A magnetic induction heating system with multi-cascaded coils and adjustable magnetic circuit for hyperthermia

Abstract Based on the characteristics of cancer cells that cannot survive in an environment with temperature over 42 °C, a magnetic induction heating system for cancer treatment is developed in this work. First, the methods and analyses for designing the multi-cascaded coils magnetic induction hyperthermia system are proposed, such as internal impedance measurement of power generator, impedance matching of coils, and analysis of the system. Besides, characteristics of the system are simulated by a full-wave package for engineering optimization. Furthermore, by considering the safety factor of patients, a two-sectional needle is designed for hyperthermia. Finally, this system is employed to test the liver of swine in ex-vivo experiments, and through Hematoxylin and Eosin (H&E) stain and NADPH oxidase activity assay, the feasibility of this system is verified.

Low-Cost Solution for RFID Tags in Terms of Design and Manufacture

Even invented and applied initially during the World War II, RFID (Radio Frequency IDentification) technologies [1] have attracted much attention recently. Precisely speaking, RFID technologies have been applied very widely in some proprietary or closed systems, for example, animal control [2], portal control (access badges), etc. in last decades. The main advantages of RFID application are, storing item data in an electronic way even for further update, data access by electromagnetic wave in a wireless manner, and allowing quick multiple accesses to RFID tags. Based on the diverse applications, different spectrum bands are allocated, for example, LF (125 134.2 kHz and 140 148.5 kHz) for animal control, HF (13.56MHz) for electronic ticket, and UHF (868 MHz-928 MHz) for logistics, etc. Most of the frequencies are located in the ISM (Industrial, Scientific and Medical) bands [1]. However, RFID was emphasized again mainly because of the need of supply chain [3]. By proposing a standard for the format of electronic data used for goods items, of which EPC (Electronic Product Code) [4] is an example, the products can be registered at once when they are shipped out from the factories in one country, and be released when they are checked out at the counter of a supermarket in the other country in the world. These products might have been transferred through Customs of many countries and carried by different traffic means. When being through these check points, the related data stored in the tags are updated. This is called “product tracking” and is to be carried out in an “Internet of Thing (IOT)” [5]. This Chapter is to have a review on the technology theme – how to provide low-cost RFID Tags, when RFID technology is to be applied into the logistics area where the RFID tags are supposed to be not re-usable and to be as “zero-cost” as possible. Generally speaking, there are three major parts composing a RFID Tag’s total cost, namely, antenna, chip and assembly for them. The cost of antenna, in addition to the design phase, is mainly dependent on the manufacturing process. Therefore, manufacturing process should be focused if antenna’s cost, then the tag, is concerned. This is the theme of this Chapter. Not like the other antenna applications, for example, wireless LAN or mobile phone, in which antennas need to be compliant to the end products’ appearance by following the market trend. In the tag antenna industry, on the contrary, it does not need to design or modify the tag antenna often. The tag antenna just needs to electrically match the chip used in the beginning of design. It is not necessary for tag providers to prepare a wide product spectrum in the market. Again, not like the mobile phone industry, RFID tag’s players just

Techniques of time-domain analysis for high-speed digital connectors

This paper has presented two approaches to analyze the high speed digital connectors. Such a kind of techniques is very useful for industrial need where Spice model is usually employed for the prediction of systematic performance. The methods given in this work is very easy to follow.

Realization of a printed-on-display antenna for mobile terminals

To develop an innovatory type of radiator, this paper presents a design method for a printed-on-display (POD) antenna, which is intended to replace the traditional ones, for example, monopole antennas, helical antennas, etc., installed on diverse wireless mobile terminals. These terminals may function as a GSM wireless telephone handset or a GPS (Global Positioning System) handset, etc. The key feature is that they have both an antenna and an electronic display. Further, for those terminals, such a new antenna design removes the drawback of being easily damaged mechanically, and is more integrated electronically. The POD antenna is composed of printed radiators which are made of a material being both electrically conductive and optically transparent, for example, ITO (indium oxide doped with tin oxide). The printed strip will be the fundamental elements for this application.

Design of RFID Reader Antenna for Exclusively Reading Single One in Tag Assembling Production

A design of RFID reader antenna including a fixture, which is equipped with a chip-attaching machine producing the RFID tags, is presented. Such an antenna is constrained to read exclusively one tag only for the purpose of functional check of the whole tag when it passes the reader antenna. Namely, the other neighbor tags on the same rolling band are ignored that time. A wideband microstrip antenna is designed and a fixture with shielding material is set up for such a reading constraint. Low efficiency with high return loss is allowed for this constraint, yet wideband is still a must to treat all possible produced tags used in different countries and areas in the world.

A Wideband DTV Antenna with a Multiple-Structure of Transmission Line Antenna

The purpose of this work is to design a wideband DTV (Digital TV) antenna with a multiple-structure of transmission line antenna. A technique of varying the width of transmission line antenna is developed firstly to shorten its length. By adding three individual transmission line antenna with different bands together, a wideband characteristics is achieved in the UHF band. This is suitable for digital TV reception, especially for the DVB-T, which is based on the OFDM, because of its near omni-directional pattern.

An extremely small transmission line antenna for DAB VHF band

This paper is to present a design method for an extremely small antenna, which is based on the traditional concept of transmission line antenna. Physically, it is composed of a short section of planar transmission line antenna and a long and slender cable. Since this slender cable can be wound and attached on the planar section, the whole apparent size is small even it is operating for DAB (Digital Audio Broadcasting) VHF band. Special techniques are applied for the purpose of impedance matching.