Frequency Tunable Antenna for Digital Video Broadcasting Hand-Held Application (original) (raw)
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Wireless Technologies, 2007 European …, 2007
Using a high-efficiency tunable antenna to cover wide band with good match is an interesting topic, especially in the case when the physical size of the terminal and the antenna is too small to allow for coverage of the full band. A design procedure for tunable mobile antennas is presented. A tunable antenna with the volume of only 6 cm 3 has been designed and fabricated to cover the DVB-H band (470 MHz to 702 MHz) with a return loss of at least 7 dB.
Coexistence of an Electrically Tunable DVB-H Antenna with the GSM Transmitter in a Mobile Phone
2007 IEEE/MTT-S International Microwave Symposium, 2007
Integration of DVB-H into mobile terminals is of high topical interest. In many cases the physical size of the terminal and antenna is too small to allow for coverage of the full DVB-H band. This paper presents an electrically tunable DVB-H antenna which covers the frequency range 462 ... 696 MHz with a return loss of at least 7 dB and remarkable radiation efficiency, using a volume of only 6 cm3. Emphasis is on the problem of coexistence of DVB-H with EGSM 900 operation which arises from the nonlinearity of the tuning element for the DVB-H antenna. A novel combination of non-linearity mitigation techniques is proposed to overcome the problem.
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In this paper, a frequency-tunable antenna is proposed based on a previous antenna which has a ladder shape and a size of 120 x 50 mm 2. It is fed using a coaxial cable and it is operational at 700 MHz which is in the UHF band with a bandwidth of 30 MHz. Varactors, having a very low resistance value and a wide range of capacitance values, are implemented on the surface of the antenna which achieves tunability in the DTV applications band used for mobile handheld devices. By using such varactors, the electromagnetic characteristics of this antenna could be changed by changing its electrical length. Multiple cases are studied; either adding a varactor on each step of the ladder antenna or adding only one varactor in a certain well justified position. The operating frequency is swept in different ranges where all of the obtained frequencies could be used for digital TV broadcasting on mobile devices.
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This communication presents the design of a compact loop antenna with independent frequency tuning. The proposed antenna consists of a feed line fed by a 50 Ω coaxial probe and four resonating arms on the adjacent sides of the feed line. The two outer resonating arms are directly coupled to the feed line and the other two inner resonating arms are coupled to the outer arms. The proposed antenna has a footprint of 25 mm × 10 mm × 0.2 mm. The designed antenna operates at 0.9 GHz, 2.4 GHz, 3.5 GHz and 5.5 GHz. Each of these bands is individually tuned using varactor diodes. Thus, the aggregation of these tunable bands provides wide bandwidth. The impedance bandwidth and percentage bandwidth of the antenna are 270/1000/400/700 MHz and 33/47.6/11/12.7 % respectively. Furthermore, the gain and efficiency of the antenna are 1.7/1.3/2.1/2 dBi and 60/63/65/69 %. The prototype antenna is fabricated and tested. The measured impedance and radiation characteristics of the antenna are in good correlation with the simulation results.
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Abstract—A novel miniature microstrip UWB antenna centered at 0.65 GHz called Breath antenna is presented. The antenna novelty is both due to its shape and functionality. It has a very compact size of 5 x 2 x 0.16 cm3. The presented antenna has extremely small dimensions compared to a wavelength
Frequency Tunable Antenna Using a Magneto-Dielectric Material for DVB-H Application
IEEE Transactions on Antennas and Propagation, 2000
This paper presents an ultracompact antenna design suited for digital video broadcasting-handheld (DVB-H) reception devices. The DVB-H frequency band is ranging from 470 to 862 MHz and divided in 49 channels of 8 MHz. Designed to be integrated in a tablet, it is not only heavily miniaturized ( at 470 MHz), but also able to cover each channel thanks to the use of a magneto-dielectric material. The advantage of using such a material is studied and described in this paper. Moreover, the operating frequency is continuously tuned over the whole DVB-H band by the integration of a varactor diode. This varactor diode has been characterized and modeled to properly cosimulate its behavior within the antenna. Limitations in terms of accepted power by the diode are emphasizing. Finally, the antenna design, including both magneto-dielectric material and varactor diode is integrated in the DVB-H receiver device. Measurement performances are presented and discussed.
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New approaches are needed for improving the performance of small antennas to fulfill the multiband operation requirements of future wireless mobile communications terminals. In this paper, a novel low-loss frequency-tuning circuit for mobile handset antennas is proposed. The presented design takes into account several factors that affect the practical mobile handset antenna design, such as the biasing limitations and distortion of the switching component as well as the effect of the mobile handset -sized ground plane. An antenna prototype that is capable of switching between the US cellular and GSM systems at 800-900 MHz frequency range was designed and measured. The antenna was positioned on a metallized printed circuit board (PCB) having size equal to that of a typical mobile phone. The tuning circuit, consisting of transmission line sections and an SPDT (single-pole, double-throw) FET switch, was fabricated directly on the substrate of the PCB. The designed antenna has high radia...
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A frequency tunable antenna made with an open-circuit monopole coupled loop antenna associated to a varactor diode is presented. The proposed antenna shows a 35.8% relative bandwidth, covering the 470-675 MHz frequency range. Theoretical and experimental results of S 11 , radiation patterns and gain have been performed and show good agreement.
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Modern telecommunication systems need to be equipped with antennas that are precisely tuned to more than one frequency in order to allow operation in several bands. Antenna precise tuning to the desired frequency is very important for system performance. In this paper the operating frequency of a PIFA antenna is adjusted using a varactor. This configuration has the advantage of continuous tuning, thus correcting any frequency deviation due to environmental or other changes. The PIFA antenna's tuning ranges from 860 MHz to 1025 MHz. Also, the geometry of the antenna is studied through simulations and the effect of the varactor is tested experimentally.
Tunable PIFA slot antenna for mobile handset and WLAN applications
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A compact planar inverted F antenna (PIFA) with a tunable frequency response is presented. Tuning of the resonant frequency is realized by loading a varactor on an embedded slot of the proposed antenna structure without further optimizing other antenna geometry parameters. The antenna exhibits a wide frequency range from 1570 to 2600 MHz with a good impedance matching (S11 ≤-10dB) covering the GPS, PCS, DCS, UMTS, WLAN and LTE systems. To validate the theoretical model and design concept, the antenna prototype was fabricated and measured. The compact size of the antenna is 15 mm × 8 mm × 3 mm, which makes this antenna a good candidate for mobile handset and wireless communication applications.