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Kin-lu Wong - One of the best experts on this subject based on the ideXlab platform.
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Inverted-F antenna-based on-frame GPS/WLAN antenna for the metal-casing Tablet Computer
2016 10th European Conference on Antennas and Propagation (EuCAP), 2016Co-Authors: Chih-yu Tsai, Kin-lu WongAbstract:An on-frame antenna for the 1.575/2.4/5.2/5.8-GHz multiband GPS/WLAN operation in the metal-casing Tablet Computer is presented. The antenna is based on a T-shape inverted-F antenna (IFA) structure and comprises an on-frame metal plate and a feed circuit board. The metal plate is disposed at about the center of the top-edge metal frame of the metal casing and has a simple rectangular shape of small size 25.5 × 7 mm2. The IFA's feeding and shorting strips with matching circuits are disposed on the feed circuit board. In this case, no metal clearance on the metal back cover of the casing and no planar board space on the main circuit board in the Tablet Computer are required by the antenna. With the T-shape IFA structure, dual-band operation to cover either the 1.575/5.2/5.8-GHz bands or the 2.4/5.2/5.8-GHz bands can be obtained for the antenna. By applying a novel band-pass shorting strip to the T-shape IFA, a multiband operation to cover the 1.575/2.4/5.2/5.8-GHz GPS/WLAN operation is obtained. The bandpass shorting strip is designed to have a band-pass characteristic at about 2.4 GHz, and its effect on the multiband operation of the antenna is discussed. Details of the proposed antenna and experimental results are presented.
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ifa based metal frame antenna without ground clearance for the lte wwan operation in the metal casing Tablet Computer
IEEE Transactions on Antennas and Propagation, 2016Co-Authors: Kin-lu Wong, Chih-yu TsaiAbstract:A metal-frame antenna for the long-term evolution/wireless wide area network (LTE/WWAN) operation in the metal-casing Tablet Computer is presented. The antenna is formed by using two inverted-F antenna (IFA) structures to provide a low band and a high band to, respectively, cover the LTE/WWAN operation in the 824–960 and 1710–2690 MHz bands. The larger IFA has a longer radiating metal strip for the low band, and the smaller IFA has a shorter radiating metal strip for the high band. The two radiating metal strips are configured to be a portion of the metal frame disposed around the edges of the metal back cover of the Tablet Computer. The projection of the metal frame lies on the edges of the metal back cover, such that there is no ground clearance between the projection and the metal back cover. Furthermore, the feeding and shorting strips with matching networks therein for the two IFAs are disposed on a small dielectric substrate (feed circuit board), which is separated from the system circuit board and the metal back cover. In this case, there is generally no planar space of the metal back cover and system circuit board occupied, and the antenna can cover the 824–960/1710–2690 MHz bands. Results of the proposed antenna are presented. An extended study is also presented to show that the antenna’s low-band coverage can be widened from 824–960 to 698–960 MHz. The wider bandwidth coverage is obtained when a switchable inductor bank is applied in the larger IFA.
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IFA-Based Metal-Frame Antenna Without Ground Clearance for the LTE/WWAN Operation in the Metal-Casing Tablet Computer
IEEE Transactions on Antennas and Propagation, 2016Co-Authors: Kin-lu Wong, Chih-yu TsaiAbstract:A metal-frame antenna for the long-term evolution/wireless wide area network (LTE/WWAN) operation in the metal-casing Tablet Computer is presented. The antenna is formed by using two inverted-F antenna (IFA) structures to provide a low band and a high band to, respectively, cover the LTE/WWAN operation in the 824-960 and 1710-2690 MHz bands. The larger IFA has a longer radiating metal strip for the low band, and the smaller IFA has a shorter radiating metal strip for the high band. The two radiating metal strips are configured to be a portion of the metal frame disposed around the edges of the metal back cover of the Tablet Computer. The projection of the metal frame lies on the edges of the metal back cover, such that there is no ground clearance between the projection and the metal back cover. Furthermore, the feeding and shorting strips with matching networks therein for the two IFAs are disposed on a small dielectric substrate (feed circuit board), which is separated from the system circuit board and the metal back cover. In this case, there is generally no planar space of the metal back cover and system circuit board occupied, and the antenna can cover the 824-960/1710-2690 MHz bands. Results of the proposed antenna are presented. An extended study is also presented to show that the antenna's low-band coverage can be widened from 824-960 to 698-960 MHz. The wider bandwidth coverage is obtained when a switchable inductor bank is applied in the larger IFA.
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dual wideband u shape open slot antenna for the lte metal framed Tablet Computer
Microwave and Optical Technology Letters, 2015Co-Authors: Kin-lu Wong, Chih-yu TsaiAbstract:The open-slot antenna is very suitable for applications in the metal-framed Tablet device, such as the Tablet Computer, to achieve a low profile with wideband or multiband operation. This article presents a U-shape open-slot (U-slot) antenna with a low profile of 7 mm to the top edge of the metal-framed Tablet Computer for the LTE operation. The U-slot has a simple structure of length 70 mm and the two slot openings thereof are disposed at the metal frame. The U-slot antenna is fed using an end-shorted 50-Ω microstrip feedline, with a wideband matching network embedded therein. The antenna can support a 0.5-wavelength slot resonant mode supported by the U-slot itself and a 0.25-wavelength slot resonant mode created by the open-slot radiator (denoted as Slot 1 in this study) formed between one slot opening and the microstrip feedline as a virtual shorting. By further using an inverted-U strip connecting across the U-slot, the antenna can create an additional open-slot radiator (denoted as Slot 2 in this study) to generate a 0.25-wavelength slot resonant mode at lower frequencies. The resonant modes supported by the U-slot, Slot 1, and Slot 2 can form two wideband operating bands to cover the LTE operation in the 698–960 and 1710–2690 MHz bands. Details of the proposed U-slot antenna and the effects of the inverted-U strip connecting across the U-slot and the matching network are addressed. Experimental results of the fabricated U-slot antenna are also presented. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2677–2683, 2015
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low profile dual wideband inverted t open slot antenna for the lte wwan Tablet Computer with a metallic frame
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Kin-lu Wong, Chih-yu TsaiAbstract: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.
Jui-han Lu - One of the best experts on this subject based on the ideXlab platform.
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Planar compact Tablet Computer monopole antenna for 4G mobile communication system
Proceedings of 2014 3rd Asia-Pacific Conference on Antennas and Propagation, 2014Co-Authors: Feng-chuan Tsai, Jui-han LuAbstract:A compact LTE Tablet Computer antenna with octaband operation is proposed by attaching a C-shaped parasitic monopole strip on the back side of the monopole antenna. The proposed antenna provides the operating impedance bandwidths of 264 / 997 MHz at the LTE bands, respectively. Given that this overall dimension is only 35 × 10 × 0.8 mm3, the proposed planar monopole antenna also provides more than 22% reduction in antenna size over that of the conventional ones. Meanwhile, the measured antenna efficiencies and peak gains are closely 60 / 66 % and 2.0 / 3.2 dBi for the LTE bands, respectively.
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planar internal lte wwan monopole antenna for Tablet Computer application
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Jui-han Lu, Feng-chuan TsaiAbstract:By using a T-shaped parasitic shorted strip, this work presents a planar coupled-fed U-shaped monopole antenna with eight-band LTE/WWAN operation in Tablet Computers. The obtained impedance bandwidths across dual operating bands approach 281 MHz and 1088 MHz at the LTE and WWAN bands, respectively. The proposed uniplanar antenna reduces the antenna size by at least 20% since the overall antenna size is only 50×15×0.8 mm3. The measured peak gains and antenna efficiencies are approximately 2.9/5.4 dBi and 72/80% for the LTE/WWAN bands, respectively. Moreover, with a compact structure, the proposed planar antenna can be deposited inside the Tablet Computer and complies with the body specific absorption rate (SAR) requirement (1.6 W/kg for 1-g body tissue) for practical applications.
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planar compact lte wwan monopole antenna for Tablet Computer application
IEEE Antennas and Wireless Propagation Letters, 2013Co-Authors: Jui-han LuAbstract:A novel design of a planar multiband monopole antenna with dual parasitic shorted strips for LTE/WWAN operation in the Tablet Computer is proposed. The obtained impedance bandwidth across the operating bands can reach about 255/980 MHz for the LTE/WWAN bands, respectively. Only with the antenna size of 45 $\,\times\,$ 15 $\,\times\,$ 0.8 mm $^{3}$ , the proposed planar antenna has the compact operation with more than 25% antenna size reduction. The measured peak gains and antenna efficiencies are about 2.5/3.6 dBi and 85/84% for the LTE/WWAN bands, respectively.
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internal uniplanar antenna for lte gsm umts operation in a Tablet Computer
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Jui-han Lu, Yi-shiang WangAbstract:With the use of an internal printed loop matching circuit, a small-size uniplanar antenna with eight-band LTE/GSM/UMTS operation in the Tablet Computer is proposed. The obtained impedance bandwidth across the operating bands can reach about 262/1610 MHz for the LTE/GSM/UMTS bands, respectively. Only with the antenna size of $40\times 15\times 0.8\ {\rm mm}^{3}$ , the proposed planar antenna has the compact operation with more than 30% antenna size reduction. Furthermore, the measured peak gains and antenna efficiencies are about 2.81/4.97 dBi and 79/87% for the LTE/GSM/UMTS bands, respectively.
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Planar Compact LTE/WWAN Monopole Antenna for Tablet Computer Application
IEEE Antennas and Wireless Propagation Letters, 2013Co-Authors: Jui-han LuAbstract:A novel design of a planar multiband monopole antenna with dual parasitic shorted strips for LTE/WWAN operation in the Tablet Computer is proposed. The obtained impedance bandwidth across the operating bands can reach about 255/980 MHz for the LTE/WWAN bands, respectively. Only with the antenna size of 45 × 15 × 0.8 mm3, the proposed planar antenna has the compact operation with more than 25% antenna size reduction. The measured peak gains and antenna efficiencies are about 2.5/3.6 dBi and 85/84% for the LTE/WWAN bands, respectively.
Chih-yu Tsai - One of the best experts on this subject based on the ideXlab platform.
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Inverted-F antenna-based on-frame GPS/WLAN antenna for the metal-casing Tablet Computer
2016 10th European Conference on Antennas and Propagation (EuCAP), 2016Co-Authors: Chih-yu Tsai, Kin-lu WongAbstract:An on-frame antenna for the 1.575/2.4/5.2/5.8-GHz multiband GPS/WLAN operation in the metal-casing Tablet Computer is presented. The antenna is based on a T-shape inverted-F antenna (IFA) structure and comprises an on-frame metal plate and a feed circuit board. The metal plate is disposed at about the center of the top-edge metal frame of the metal casing and has a simple rectangular shape of small size 25.5 × 7 mm2. The IFA's feeding and shorting strips with matching circuits are disposed on the feed circuit board. In this case, no metal clearance on the metal back cover of the casing and no planar board space on the main circuit board in the Tablet Computer are required by the antenna. With the T-shape IFA structure, dual-band operation to cover either the 1.575/5.2/5.8-GHz bands or the 2.4/5.2/5.8-GHz bands can be obtained for the antenna. By applying a novel band-pass shorting strip to the T-shape IFA, a multiband operation to cover the 1.575/2.4/5.2/5.8-GHz GPS/WLAN operation is obtained. The bandpass shorting strip is designed to have a band-pass characteristic at about 2.4 GHz, and its effect on the multiband operation of the antenna is discussed. Details of the proposed antenna and experimental results are presented.
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IFA-Based Metal-Frame Antenna Without Ground Clearance for the LTE/WWAN Operation in the Metal-Casing Tablet Computer
IEEE Transactions on Antennas and Propagation, 2016Co-Authors: Kin-lu Wong, Chih-yu TsaiAbstract:A metal-frame antenna for the long-term evolution/wireless wide area network (LTE/WWAN) operation in the metal-casing Tablet Computer is presented. The antenna is formed by using two inverted-F antenna (IFA) structures to provide a low band and a high band to, respectively, cover the LTE/WWAN operation in the 824-960 and 1710-2690 MHz bands. The larger IFA has a longer radiating metal strip for the low band, and the smaller IFA has a shorter radiating metal strip for the high band. The two radiating metal strips are configured to be a portion of the metal frame disposed around the edges of the metal back cover of the Tablet Computer. The projection of the metal frame lies on the edges of the metal back cover, such that there is no ground clearance between the projection and the metal back cover. Furthermore, the feeding and shorting strips with matching networks therein for the two IFAs are disposed on a small dielectric substrate (feed circuit board), which is separated from the system circuit board and the metal back cover. In this case, there is generally no planar space of the metal back cover and system circuit board occupied, and the antenna can cover the 824-960/1710-2690 MHz bands. Results of the proposed antenna are presented. An extended study is also presented to show that the antenna's low-band coverage can be widened from 824-960 to 698-960 MHz. The wider bandwidth coverage is obtained when a switchable inductor bank is applied in the larger IFA.
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ifa based metal frame antenna without ground clearance for the lte wwan operation in the metal casing Tablet Computer
IEEE Transactions on Antennas and Propagation, 2016Co-Authors: Kin-lu Wong, Chih-yu TsaiAbstract:A metal-frame antenna for the long-term evolution/wireless wide area network (LTE/WWAN) operation in the metal-casing Tablet Computer is presented. The antenna is formed by using two inverted-F antenna (IFA) structures to provide a low band and a high band to, respectively, cover the LTE/WWAN operation in the 824–960 and 1710–2690 MHz bands. The larger IFA has a longer radiating metal strip for the low band, and the smaller IFA has a shorter radiating metal strip for the high band. The two radiating metal strips are configured to be a portion of the metal frame disposed around the edges of the metal back cover of the Tablet Computer. The projection of the metal frame lies on the edges of the metal back cover, such that there is no ground clearance between the projection and the metal back cover. Furthermore, the feeding and shorting strips with matching networks therein for the two IFAs are disposed on a small dielectric substrate (feed circuit board), which is separated from the system circuit board and the metal back cover. In this case, there is generally no planar space of the metal back cover and system circuit board occupied, and the antenna can cover the 824–960/1710–2690 MHz bands. Results of the proposed antenna are presented. An extended study is also presented to show that the antenna’s low-band coverage can be widened from 824–960 to 698–960 MHz. The wider bandwidth coverage is obtained when a switchable inductor bank is applied in the larger IFA.
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dual wideband u shape open slot antenna for the lte metal framed Tablet Computer
Microwave and Optical Technology Letters, 2015Co-Authors: Kin-lu Wong, Chih-yu TsaiAbstract:The open-slot antenna is very suitable for applications in the metal-framed Tablet device, such as the Tablet Computer, to achieve a low profile with wideband or multiband operation. This article presents a U-shape open-slot (U-slot) antenna with a low profile of 7 mm to the top edge of the metal-framed Tablet Computer for the LTE operation. The U-slot has a simple structure of length 70 mm and the two slot openings thereof are disposed at the metal frame. The U-slot antenna is fed using an end-shorted 50-Ω microstrip feedline, with a wideband matching network embedded therein. The antenna can support a 0.5-wavelength slot resonant mode supported by the U-slot itself and a 0.25-wavelength slot resonant mode created by the open-slot radiator (denoted as Slot 1 in this study) formed between one slot opening and the microstrip feedline as a virtual shorting. By further using an inverted-U strip connecting across the U-slot, the antenna can create an additional open-slot radiator (denoted as Slot 2 in this study) to generate a 0.25-wavelength slot resonant mode at lower frequencies. The resonant modes supported by the U-slot, Slot 1, and Slot 2 can form two wideband operating bands to cover the LTE operation in the 698–960 and 1710–2690 MHz bands. Details of the proposed U-slot antenna and the effects of the inverted-U strip connecting across the U-slot and the matching network are addressed. Experimental results of the fabricated U-slot antenna are also presented. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2677–2683, 2015
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low profile dual wideband inverted t open slot antenna for the lte wwan Tablet Computer with a metallic frame
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Kin-lu Wong, Chih-yu TsaiAbstract: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.
Zih-guang Liao - One of the best experts on this subject based on the ideXlab platform.
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passive reconfigurable triple wideband antenna for lte Tablet Computer
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Kin-lu Wong, Zih-guang LiaoAbstract:A passive reconfigurable triple-wideband Tablet Computer antenna for the LTE operation in the low band of $698\sim 960~{\rm MHz}$ , middle band of $1710\sim 2690~{\rm MHz}$ , and high band of $3400\sim 3800~{\rm MHz}$ 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 $10 \times 35 \times 3~{\rm mm}^{3}$ . 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.
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Passive Reconfigurable Triple-Wideband Antenna for LTE Tablet Computer
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Kin-lu Wong, Zih-guang LiaoAbstract: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 ×35 ×3 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.
Kai Kang - One of the best experts on this subject based on the ideXlab platform.
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Compact Eight-Band Frequency Reconfigurable Antenna for LTE/WWAN Tablet Computer Applications
IEEE Transactions on Antennas and Propagation, 2014Co-Authors: Peng-peng Li, Joshua Le-wei Li, Kai KangAbstract:A novel eight-band LTE/WWAN frequency reconfigurable antenna for Tablet Computer applications is proposed in this communication. With a small dimension of 40 × 12 × 4 mm3, the proposed antenna comprises a loop feeding strip and a shorting strip in which a single-pole four-throw RF switch is embedded. The RF switch is used to change the resonant modes of lower band among four different working states, so that the antenna can provide a multiband operation of LTE700/GSM850 /900/1800/1900/UMTS2100/LTE2300/2500 with return loss better than 6 dB. Reasonably good radiating efficiency and antenna gain are also achieved for the practical Tablet Computer.
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compact eight band frequency reconfigurable antenna for lte wwan Tablet Computer applications
IEEE Transactions on Antennas and Propagation, 2014Co-Authors: Peng-peng Li, Joshua Le-wei Li, Kai KangAbstract:A novel eight-band LTE/WWAN frequency reconfigurable antenna for Tablet Computer applications is proposed in this communication. With a small dimension of 40 × 12 × 4 mm3, the proposed antenna comprises a loop feeding strip and a shorting strip in which a single-pole four-throw RF switch is embedded. The RF switch is used to change the resonant modes of lower band among four different working states, so that the antenna can provide a multiband operation of LTE700/GSM850 /900/1800/1900/UMTS2100/LTE2300/2500 with return loss better than 6 dB. Reasonably good radiating efficiency and antenna gain are also achieved for the practical Tablet Computer.
