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This study proposes a small antenna operating in triple-band for mobile terminal equipment applications with 3-dimension (3-D) model. The first radiator, Rl, mainly contributes the region of the low frequency band, 2.40 ~ 2.48 GHz. The second radiator, R2, is used to create the region of the high frequency band, Unlicensed Nil - 5 GHz (5.12 ~ 5.35 GHz), by the conception of coupling between the two...
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...
In this work, approaches that aim to reduce SAR on human body were attempted. Algorithms were devised for automated antenna blockage assessment. These algorithms are used to determine the presence and location of obstacles in adjacent to a mobile device, A multi-antenna mock-up was fabricated to house several antennas at various locations on a palm-size device. According to the variation in the amount...
The mobile industry is constantly pushing the envelope to construct smaller and more versatile wireless appliances. In contemporary designs, multiple wireless systems are introduced into the mobile terminal such as GSM/EDGE/3G TX and RX, Bluetooth, WLAN, GPS and perhaps even DVB-H, UWB. High data rate components such as camera (5MP+), display (QVGA+) and hi-speed internal memories and I/O-channels...
It has recently been demonstrated that the loop antenna is very promising for achieving dual-band or multiband operation in the mobile phone. Although these loop antennas are mainly operated as half-wavelength and one-wavelength structures, unlike the conventional quarter-wavelength planar inverted-F antennas or low-profile monopole antennas for mobile phones, they still can be configured to occupy...
Tomorrows mobile terminals shall be multi-standard platforms for various kinds of wireless applications. So far, nowadays mobiles consist of a combination of different separated modules e.g. for GSM, for Bluetooth, WLAN, etc.. Along with these different modules typically separated antennas are use, such as one for GSM/UMTS and another one for Bluetooth and yet another one for FM radio. Currently the...
In this paper, the behavior of the impedance bandwidth, SAR and radiation efficiency of mobile terminal antennas are studied by FDTD-based simulations at a wide frequency range, from 0.6 GHz to 6 GHz. The used models comprise a basic coupling element based antenna structure placed beside a simple dielectric block modeling the user. The results of this paper give novel information about the behavior...
Specific absorption rate (SAR) assessment plays a crucial role in the development of small antennas for wireless systems. Indeed, such antennas are generally in close interaction with human body, resulting in exposure safety issues. While the standard procedure remains the reference to ensure compliance with existing norms, various needs for faster SAR measurement have been pushing for the development...
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 printed monopole antenna for quad-band operation in the mobile phone has been proposed and studied. The antenna occupies a volume of 24.3 x 20 x 4 mm3 with a very low height as compared to others, yet it can cover two wide bands centred at about 925 MHz and 1920 MHz to realize GSM/DCS/PCS/UMTS operation. Good radiation characteristics of the antenna over the operating bands have also been observed...
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...
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...
In this paper, we proposed a Folded type Rectangular Loop Antenna (FRLA) for one-seg. The measurement and simulation results indicated that the characteristics of the radiation patterns are similar to a rectangular loop antenna with full wavelength wire and resonates in the lower UHF band. The measured gain of the FRLA is -2.8dBi and the simulated gain is -2.2dBi. In the future, we will study configurations...
In this paper, we propose a configuration of antenna system for mobile ground terminal using GPS and gyroscope terminal unit as automatic-navigation system to track the ETS-VIII satellite. To miniaturize the antenna system we introduce an electronically tracking rather than mechanically by use of a developed control program. With this configuration the antenna system becomes light and low profile...
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...
We have presented a dual spiral line loaded monopole antenna on a vertical ground plane. The antenna has a 152 MHz impedance bandwidth (820 ~ 972 MHz) for VSWR<2 at a central frequency of 896 MHz. The proposed antenna covers both the cellular and UHF RFID bands in Korea and is suitable as the internal antenna of a handheld transceiver unit because of its thin configuration, broad bandwidth, and...
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