WILEY ANTENNAS FOR PORTABLE DEVICES phần 1- potx

... Designs Omnidirectional radiation performance is important for portable UWB devices, but the antennas with stable directional radiation may also be of interest, for instance, in portable radar apparatus. ... the design. Therefore, this chapter started with a discussion of the special design considerations for UWB antennas. In accordance with these considerations, antennas suit...

Ngày tải lên: 07/08/2014, 21:20

... impedance perfor- mance of planar antennas. For instance, the coaxial probe excites the planar radiator via a U-shaped or inverted E-shaped transition which forms an impedance transformer for broad- band ... effects of the feeding structure on the performance (especially the impedance performance) of the dipole should be taken into account. 226 Antennas for Wearable Devices -2 -1 0...

Ngày tải lên: 07/08/2014, 21:20

... FHSS stands for frequency hopping spread spectrum and LBT stands for listen before talk. 3.3 Design Considerations for RFID Tag Antennas The most important aspect of an RFID system’s performance ... spiral coil antennas are most commonly used to capture the energy from the reader by coupling. At UHF and MWF frequencies, dipole antennas, meander line antennas, slot antennas, and p...

Ngày tải lên: 07/08/2014, 21:20

... types of antennas have been reported to be used as passive far-field tag antennas, including meander line antennas, [22, 23], folded dipole antennas [24, 25], loop antennas [26, 27], slot antennas ... inverted-F antennas [30], planar inverted-F antennas [31, 32], slotted planar inverted-F antennas [33], patch antennas [34] and so on. Each type of antenna has its inherent ch...

Ngày tải lên: 07/08/2014, 21:20

... to connect portable and/or fixed electronic devices. 802.11g devices can provide date rate up to 54 Mbps. For even higher data rate, 802.11a devices in the 5 GHz Unlicensed National Information ... achieve the potential performance such integration can offer. The goal of this chapter is to highlight the specific design Antennas for Portable Devices Zhi Ning Chen © 2007 John...

Ngày tải lên: 07/08/2014, 21:20

... has three embedded antennas, one for Bluetooth ™ and two for WLAN. (The latest laptops have five antennas, including two for WWAN applica- tions.) Two antennas, usually the WLAN antennas, are typically ... the size of the usual planar antennas is still too large for many portable devices, such as laptop computers, where very thin and low-profile antennas are required. For...

Ngày tải lên: 07/08/2014, 21:20

... antenna for mobile devices for 2.4 GHz range. Hitachidensen, no. 21, 2002. [55] M. Ikegaya, T. Sugiyama, S. Takaba, S. Suzuki, R. Komagine and H. Tate, Development of film type antenna for mobile devices. ... antennas for the treatment of cardiac catheter ablation [8], the treatment of benign prostatic hypertrophy [9], and so on, because the antennas for such treatments and t...

Ngày tải lên: 07/08/2014, 21:20

... efficient directive antennas with main radiating beam conformal to the human torso are needed to maximally stabilize the channel (Figure 6.17). 200 Antennas for Wearable Devices wearable antennas need ... absorption rate (SAR) for proximate antennas [18] and the propagation on and off the body for use in mobile phones [19]. 6.2.1 Wearable Antennas for BANs/PANs 6.2.1.1 Pro...

Ngày tải lên: 07/08/2014, 21:20