Query: lte antenna

title: Compact magneto electric dipole antenna for LTE femtocell base stations
abstract: A compact magneto electric dipole antenna for long term evolution femtocell base stations is proposed. It consists of horizontal defected semi circular patches that act as electric dipole and vertical rectangular patches that work as magnetic dipole shorted to ground plane. By modifying the regular square ground into minimum ground and by choosing an appropriate height between the horizontal patches and ground, the size of the antenna is considerably reduced without compromising the bandwidth. The overall dimension of the proposed antenna is (68 x 56 x 20)mm3, which is 82.4% less than the original antenna of dimension (120 x 120 x 30)mm3. At S 11 10 dB, the simulated and measured impedance bandwidth of the proposed antenna is 65.7% (2.03 4.02 GHz) and 63.3% (2.05 3.95 GHz) respectively. Stable radiation pattern at both planes and moderate gain of 5 dBi are obtained.

title: Decoupled Dual Antenna System Using Crossed Neutralization Lines for LTE/WWAN Smartphone Applications
abstract: A decoupled dual antenna system for Long Term Evolution (LTE)/Wireless Wide Area Network (WWAN) smartphone applications is presented. The proposed dual antenna system is composed of two symmetric antenna elements and two crossed neutralization lines. The antenna element of the proposed dual antenna system consists of a driven branch and a parasitic ground branch, generating a couple of resonant modes. The dual antenna system incorporates two crossed neutralization lines to reduce the mutual coupling between the two closely spaced antenna elements. A measured impedance bandwidth with S11 lower than 6 dB over 702 968, 1698 2216, and 2264 3000 MHz is obtained. Within the operating bands, the measured S21 is lower than 10 dB. Based on the measured 3 D radiation patterns, several important figures of merit for the diversity performance of the dual antenna system are calculated, including the envelop correlation coefficient, the mean effective gain, and the diversity gain, and good results are obtained.

title: Passive Reconfigurable Triple Wideband Antenna for LTE Tablet Computer
abstract: A passive reconfigurable triple wideband tablet computer antenna for the LTE operation in the low band of 698 960 MHz, middle band of 1710 2690 MHz, and high band of 3400 3800 MHz is presented. The antenna mainly acts like an inverted F antenna (IFA) at frequencies in the LTE low and middle bands and like a loop antenna at frequencies in the LTE high band. The reconfigurable IFA/loop antenna is achieved without active switch circuits and occupies a small volume of 10 x35 x3 mm3. The antenna is obtained by first configuring the radiating arm of an IFA to be folded and coupled to the device ground plane through a distributed capacitor. Then, the IFA's shorting and feeding strips are respectively loaded with an inductor and a capacitor. This leads to good excitation of a resonant mode generated in the LTE low band with the radiating arm length of the IFA only about 0.16 wavelength at 800 MHz. By further aided using a high pass matching circuit integrated within the antenna, a wide low band is obtained for the antenna. The IFA's first two higher order modes can also be excited in the middle band. Owing to the distributed capacitor between the IFA's radiating arm and the device ground plane, the two higher order modes can lead to a wide middle band for the antenna. At frequencies in the LTE high band, the antenna mainly acts like a loop antenna operated at its one wavelength loop mode, which contributes to a wide high band for the antenna. Triple wideband operation covering the LTE operation is hence obtained. Details of the proposed antenna are described, and experimental results are presented. Working principle of the antenna acting like an IFA and a loop antenna at different frequencies is discussed.

title: Compact Frequency Reconfigurable Antenna for LTE/WWAN Mobile Handset Applications
abstract: In this communication, a compact frequency reconfigurable antenna for LTE/WWAN mobile handset applications is proposed. The proposed antenna mainly consists of radiating elements and two PIN diodes. In addition, the antenna has a simple structure with a compact size of 36.5 x 10 mm2. This antenna operates in six modes, and each mode is given a different resonant pathway by adjusting the bias states of two PIN diodes. When PIN diodes #1 and #2 are in the ON and OFF states, respectively, the proposed antenna can cover the LTE700 (698 787 MHz) band by operating in mode 1. Moreover, the wide bandwidth in a higher band formed by combining modes 2 and 3 can cover the LTE2300 (2305 2400 MHz) and LTE2500 (2500 2690 MHz) bands. When PIN diodes #1 and #2 are in the OFF and ON states, respectively, a resonant frequency in the lower band is formed by integrating modes 4 and 5. This can cover the GSM850 (824 894 MHz) and GSM900 (880 960 MHz) bands. When the two PIN diodes are in the ON state, the proposed antenna can cover the GSM1800 (1710 1880 MHz) GSM1900 (1850 1990 MHz) and UMTS (1920 2170 MHz) bands in operating mode 6.

title: Low Profile Dual Wideband Inverted T Open Slot Antenna for the LTE/WWAN Tablet Computer With a Metallic Frame
abstract: An inverted T open slot (ITOS) antenna with a low profile suitable for the LTE/WWAN tablet computer with a metallic frame is presented. With a low profile of 7 mm above the top edge of the device ground plane of the tablet computer, the ITOS antenna can provide two wide operating bands of 698 960 and 1710 2690 MHz to cover the LTE/WWAN operation. The ITOS antenna shows a simple structure and can fit in the narrow region between the metallic frame and the display panel of the tablet computer. The lower and higher operating bands of the antenna can be, respectively, controlled by the low band and high band feeds thereof. The low band feed excites the antenna's longer slot arm to obtain a wide lower band covering the 698 960 MHz band. The high band feed excites the antenna's shorter slot arm to achieve a wide higher band covering the 1710 2690 MHz band. Working principle of the low profile ITOS antenna for generating the dual wideband operation is described. Simulated and experimental results of the antenna are presented and discussed.

title: Small Size Hybrid Loop/Open Slot Antenna for the LTE Smartphone
abstract: A small size hybrid loop/open slot antenna for the LTE smartphone is presented. The antenna is disposed in a small notch of 7 x 40 mm2 in the system ground plane of the smartphone and has a thickness of 5.8 mm to be capable of embedding within most modern smartphones. The antenna mainly comprises a capacitively fed loop antenna and a ground strip embedded therein to create an open slot antenna so as to generate additional resonant modes for bandwidth enhancement. The antenna can provide two wide operating bands to cover the LTE low band (698 960 MHz) and the LTE middle/high bands (1710 2690/3400 3800 MHz) In this study, the creation of the open slot antenna using a ground strip embedded in the ground clearance region for the coupled fed loop antenna is addressed. The proposed antenna is also fabricated and tested. Both the simulation study and the experimental results are presented.

title: Planar Printed Multi Resonant Antenna for Octa Band WWAN/LTE Mobile Handset
abstract: In this letter, a planar printed multiple band antenna is proposed for mobile handset applications. The antenna consists of a driven monopole with multiple branches, and a parasitic ground strip with an open slot. By properly tuning the dimensions and positions of each part of the proposed antenna, octa band operation is achieved with good radiation efficiency. For lower frequency, the LTE700, GSM850, and GSM900 bands are provided by the l/4 modes of the driven monopole and the parasitic ground strip. For upper frequency, the DCS, PCS, UMTS, LTE2300 and LTE2500 bands are covered by the higher order modes of the driven monopole and the parasitic ground strip. The open slot and the shorter driven branch are utilized to widen the bandwidth in the upper frequency. All the mentioned operating bands are achieved in a small area of 15 x60 mm2. The measured 6 dB reflection coefficient bandwidth is 405 MHz 660 1065 MHz) in the lower band and ranges from 1665 MHz to more than 3000 MHz in the upper band.

title: A Compact Frequency Reconfigurable Dielectric Resonator Antenna for LTE/WWAN and WLAN Applications
abstract: A compact frequency reconfigurable dielectric resonator antenna (DRA) for LTE/WWAN and WLAN applications is investigated and presented. The proposed antenna provides the frequency tuning between 1.60 and 2.71 GHz. The design consists of four identical rectangular dielectric resonators with permittivity of 10 each and three p i n diode switches that are located on the feedline network between each of two dielectric resonators. The proposed antenna size is 20 x36 x5.57 mm3, which is suitable for mobile devices. The measurement and simulation results are applied to demonstrate the performance of the proposed antenna. From the measured results, it is found that the proposed antenna with acceptable performance provides four single band modes with the impedance bandwidths of 17% 11% 14% and 6%

title: A high efficient automotive roof antenna concept for LTE, DAB L, GNSS and SDARS with low mutual coupling
abstract: A combination of a new antenna for Long Term Evolution (LTE) technology and Digital Audio Broadcasting in L band (DAB L) together with compact antennas for Global Navigation Satellite System (GNSS) and Satellite Digital Audio Radio Services (SDARS) is presented. The antenna module is designed to be placed on the roof of a car underneath a shark fin formed housing. The LTE/DAB L antenna operates at frequency bands from 698 MHz to 960 MHz and from 1427.9 MHz to 2700 MHz covering available LTE frequencies. This antenna has a high efficiency due to panel design and obtains monopole characteristics in all LTE frequencies. In combination with GNSS and SDARS ring antennas the structure yields a sufficient decoupling to these antennas. This is even true for the SDARS antenna sharing the same phase center with the LTE antenna. The satellite antennas achieve the required characteristics at their center frequencies of 1575 MHz and 2332 MHz.

title: Small Size LTE/WWAN Tablet Device Antenna With Two Hybrid Feeds
abstract: A small size tablet device antenna formed by a simple folded metal plate excited by a low band feed (direct feed with matching network) and a high band feed (gap coupled feed with matching network) for the LTE/WWAN operation in the 698 960 and 1710 2690 MHz bands is presented. The folded metal plate has a size of 3 x 5 x 30 mm3 and is disposed in a clearance area of 10 x 30 mm2 (300 mm2) above the top edge of the device ground plane. The matching network in the low band feed compensates for additional capacitance for the folded metal plate with a resonant length much less than 0.25 wavelength in the lower band (698 960 MHz) and enhances the antenna's impedance matching to achieve a wide lower band. The matching network in the high band feed also enhances the antenna's impedance matching to achieve a wide higher band (1710 2690 MHz) In addition, the coupling gap in the high band feed can reject the low band frequency. Also, the matching network in the low band (high band) feed includes a bandpass circuit which can help reject the high band (low band) frequency. Good isolation between the two hybrid feeds can, hence, be obtained, which makes the antenna with simple structure and small size have good radiation performances in both lower and higher bands. Details of the proposed antenna are presented.