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.
We developed a PIFA made of flexible printed circuit, which is available for Bluetooth and IEEE802.11a/b/g applications. We measured the characteristics of the antenna when it is folded along the coaxial cable. It is shown that the characteristics do not vary much when the angle of folding is less than 90deg. The performance is confirmed by a simulation based on the FDTD method. The antenna is expected...
Printed inverted-F antennas (PIFA) are very popular choice of internal antenna for cellular handsets, owing to its ease of design to achieving multiple frequency resonances. When having multiple resonating frequency structure in a single embodiment, tuning of the resonant frequency can be very tricky. Lherefore, it is desired to have frequency independent tuning of two or more separate frequencies...
Due to the low profile and the simple structure, the planar monopole antennas and the planar inverted-F antennas (PIFA) have been very attractive in the mobile handset applications. Although the planar loop antennas possess similar features, they have not been discussed extensively. Moreover, the urging requirement for multi-band operations makes the handset antenna design more and more challenging...
The investigation of user interaction presented in this paper focuses on the comparison between the free space and data mode diversity performance of a tri-band "stick" phone size prototype in the uniform 3D propagation environment. A state-of-the-art phantom hand from IndexSAR is used to hold the diversity prototype in the data mode position.
A proposed compact PIFA antenna with small dimension suitable for 4G handsets is presented. Overall volume of this antenna is significantly small with 0.741cm3 that makes it attractive for recent modern slim personal communication handhelds. This proposed antenna is attached with a varactor diode to archive tuning frequency property that makes antenna able to covering most popular frequency bands...
This paper proposed a PIFA with an artificial cardiac pacemaker for use of MICS. The calculation model is composed of the PIFA and the pacemaker embedded in the 2/3 muscle-equivalent phantom. The distance between the surface of the phantom and the antenna is changed and the model is numerically analyzed by use of the FDTD method. Numerical results show that as the distance d increases, the real part...
Measured results of three typical internal mobile phone antennas held in talk-position by a real human operator are presented. Depending on exact placement of index finger, frequency band and type/position of radiator, total body losses ranging from 6-26 dB have been measured. In all cases, the absorption loss was much more significant than the mismatch loss. The monopole (off-ground) antenna was...
In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication Services, 1880-1990 MHz), UMTS (Universal Mobile Telecommunications System, 1.9-2.17 GHz), WiBro (2300-2390 MHz), Bluetooth (2.4-2.48 GHz), S-DMB (Satellite-Digital Multimedia...
The compact antennas with balanced effect have been introduced with the change of their configuration. These antennas are effective to mitigate the antenna performance degradation due to the human body effect and also have flexible adjustment of antenna impedance and capacity of wideband and multi-resonance characteristics. Second, a downsizing technique of antenna for handset by utilizing a magnetic...
A broadband compact antenna is implemented by modifying the full ground plane metamaterial antenna. The strip matching ground is used to enhance the impedance matching by 800% compared to the full ground plane case while maintaining its compact size as 1/10 lambda0 by 12 size of antenna ground plane. Planar inverted F antenna (PIFA) is also known for its compact size and its capability to easily operate...
In this paper, we have shown that it was still possible to get a very good diversity system gain for very closely spaced UMTS PIFAs (0.027 lambda0) positioned on the PCB of a small communicating object by using the neutralization technique. The goal is to see how efficient can be the neutralization technique when the radiators are separated by a very small distance or in other terms, how close can...
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.