... 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...
... 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...
... require antennas – for example, GPS position
fixing, Bluetooth
™
or wireless local area network (WLAN) connectivity, and radio or TV
entertainment services. Antennas for these services compete for ... current patents.
Whip antennas. A quarter-wavelength whip or blade mounted on a large handset provides
efficiency which still forms the standard by which other antennas are judged....
... 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...
... 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...
... 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...
... 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...
... 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...