The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a low profile circular patch loaded monopole antenna suitable for embedded use in a manhole cover. It consists of a center-fed circular patch and two shorting strips connecting the patch to the ground. The simulated and field test results show that the antenna embedded in a manhole cover has a good gain and omnidirectional radiation pattern on the ground surface. The antenna can...
The authors propose a new method to optimise the geometry of partially reflective superstrates (PRSs) of resonant-type antennas, which is suggested to enhance both antenna gain and bandwidth at the same time. Specifically, their approach is about finding optimum arrangement of unit cells printed on PRSs. To construct an optimised PRS, they introduce some defected cells that are not covered with ordinary...
This paper presents a low-power CMOS single-chip transceiver for sub-GHz wireless sensor network applications, which complies IEEE 802.15.4-2012 standard. It embodies RF transceiver section based on direct-conversion transmitter and low-IF receiver architecture. To validate its operation, the prototype is fabricated in 0.18um GF standard CMOS process. It shows +5dBm TX output power and −85dBm RX sensitivity...
This paper presents the design and experimental results of low power CMOS single-chip for 868 MHz and 915 MHz bands wireless sensor network applications based on IEEE 802.15.4 standard; especially RF transceiver part. Single-chip radio consists of RF transceiver section and digital baseband section. Implemented in a 0.18 µm CMOS technology the receiver shows sensitivity of −100dBm and −93 dBm in BPSK...
RFID systems are based on backscattering communications, and this encourages research on how to guarantee a reliable RX performance under simultaneous TX/RX operation. To isolate RX from the TX self-jammer, the RFID transceivers are generally accompanied by an off-chip circulator or isolator. This has advantages in selectivity between tag signal and blocker, but it results in a low level of integration...
This paper presents a switching PA-based polar transmitter which achieves uniform and robust performances under process, voltage, and temperature variations. A new approach utilizing current driven envelope signal is proposed, leading to much more accurate control of output power of the PA. In addition, the proposed adaptive LO technique extends the available linear control range of the PA. Fabricated...
The proposed CMOS digital-to-RF transmitter with filtering, which is designed in TSMC 0.18 mum CMOS technology, merges RF functions, including pulse shape filtering and frequency up-mixing into a simple DAC (digital-to-analog converter) circuit building block, named as DRFC (digital-to-RF with filtering converter). Moreover, the capability to handle data with wide bandwidth is added to DRFC without...
The proposed CMOS digital-to-RF transmitter with filtering, which is designed in TSMC 0.18 um CMOS technology, merges RF functions, including pulse shape filtering and frequency up-mixing into a simple DAC (digital-to-analog converter) circuit building block, named as DRFC (digital-to-RF with filtering converter). Moreover, the capability to handle data with wide bandwidth is added to DRFC without...
Data mining in the stream data handles quality and data analysis using extremely large and infinite amount of data and disk or memory with limited volume. In such traditional transaction environment it is impossible to perform frequent items mining because it requires analyzing which item is a frequent one to continuously incoming stream data and which is probable to become a frequent item. This paper...
Power Line Communication (PLC) is an evolving communication network technology using the existing power lines and enables to provide the automatic meter reading service, high-speed Internet service as well as home networking service. As the use of PLC network and their applications increase, we need to manage the resources of PLC networks efficiently. Major PLC chipset and modem vendors are trying...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.