# Kin-Lu Wong's research while affiliated with National Sun Yat-sen University and other places

## Publications (749)

Article
A wideband four-port single-patch antenna for fifth-generation (5G) MIMO access-point application in 3.3-5.0 GHz (41% centered at 4.15 GHz) is presented. The antenna uses a simple square patch of size 42 mm x 42 mm (0.58λ x 0.58λ at 4.15 GHz) mounted 10 mm above a ground plane. To generate four isolated waves in a wide band for MIMO application, th...
Article
A low-profile six-port circular patch antenna generating six uncorrelated waves in a wide band of about 5.8-7.5 GHz (based on 3:1 VSWR, fractional bandwidth about 25%) is presented. The antenna thickness is 1.4 mm (about $0.027\lambda$ at 5.8 GHz), which includes a 0.4 mm thick FR4 substrate with the circular patch printed thereon and an additiona...
Article
A very-wide-band six-port circular patch antenna for MIMO access-point application is presented. The six-port patch antenna can radiate six uncorrelated waves (envelope correlation coefficients < 0.01) in a very wide band of about 3.1-7.2 GHz (fractional bandwidth about 80%), which can be applied to cover 3.3-5.0 GHz for 5G communication and 6.425-...
Article
A conjoined yet decoupled wideband multi-antenna MIMO linear patch array (LPA) based on using a wideband patch antenna with dual slanted (±45°) shorting metal walls as a building antenna unit (BAU) is presented. The BAU alone can have a very wide operating band of larger than 4 GHz (about 3.25-7.40 GHz, a fractional bandwidth of about 78%). Owing t...
Article
Based on applying the hybrid metal walls and half-wavelength diagonal open-slots, a four-port square patch antenna (SPA) having high port isolation (>20 dB) and low radiation correlation (envelope correlation coefficients < 0.01) for 2.4/5/6 GHz (2.4-2.5/5.15-7.125 GHz) WiFi-6E $4\times 4$ MIMO access-point application is presented. The four-port S...
Article
Full-text available
A wideband three-port equilateral triangular (ET) patch antenna capable of generating three uncorrelated broadside-radiation waves for 5G MIMO access-point application is presented. The three-port ET patch antenna has a simple structure for easy implementation. To our best knowledge, using a simple ET patch antenna to generate three uncorrelated wa...
Article
A low-profile wideband four-corner-fed square patch antenna for 5G MIMO mobile antenna application is presented. The proposed antenna uses a single square patch to generate four uncorrelated waves over a wide band to cover 3.3-4.2 GHz (5G N77 band) with a low profile of 2.4 mm (0.03lumda at 3.75 GHz). Wideband operation is obtained by generating th...
Article
A new two-port same-polarized rectangular patch antenna based on generating two out-of-phase TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> modes for multiple-input–multiple-output (MIMO) access-point antenna application is proposed. Two simple probe feeds located at two opposite positions...
Article
Four dual-band shorted patch antennas (SPAs) with a low profile of 1 mm (0.008λ at 2.4 GHz) integrated into a square-ring structure of size 66 mm × 66 mm (about 0.53λ × 0.53λ at 2.4 GHz) for 4 × 4 multi-input-multi-output (MIMO) operation are presented for mobile device applications. Each SPA consists of a larger shorted patch and a smaller shorted...
Article
A four-port annular-ring (AR) patch antenna generating four decoupled waves in 3.3-5.0 GHz (41% at 4.15 GHz) with antenna efficiency better than about 84% and envelope correlation coefficients (ECCs) less than 0.05 is presented for fifth-generation multi-input-multi-output (MIMO) access-point applications. The AR patch is placed 10 mm above the gro...
Article
Three wideband monopolar patch antennas (MPAs) integrated into a Y-shape structure for multi-input- multi-output (MIMO) operation in 3300~4200 MHz for fifth-generation (5G) access points are presented. Each MPA has an antenna height of 10 mm (about 0.11λ at 3300 MHz) and a top-patch length of 22 mm (about 0.24λ at 3300 MHz). Each MPA is capacitivel...
Article
A very-low-profile grounded coplanar waveguide (GCPW)-fed slot antenna with an antenna thickness of 0.8 mm (about 0.0064λ at 2.4 GHz) and a compact size of $15 mm \times 40 mm$ (about $0.12λ \times 0.32\lambda$ at 2400 MHz) for 2.4/5.8 GHz dual-band wireless local area network (WLAN) on-body antenna application is presented. The GCPW slot anten...
Article
Four grounded coplanar waveguide (GCPW)-fed open-slot antennas conjoined into a cross shape with a central circular slot are presented for 4 × 4 fifth-generation (5G) multi-input multi-output (MIMO) operation in 3.3 GHz ∼ 4.2 GHz. The four conjoined slot antennas have a 1 mm low profile (about 0.01λ at 3.3 GHz) and a compact size of 42 mm × 42 mm (...
Poster
Full-text available
Mutual coupling between the LTE low-band MIMO antennas is challenging due to excitation of the system ground plane and limited space inside the smartphone 0.85 0.9 0.95 1 0.85 0.9 0.95 1 Two antennas have compact size with continuous frame length of 72.4 mm (about 0.22λ at 900 MHz) to fit in one short edge of the smartphone Two conjoined-loop MIMO...
Conference Paper
Full-text available
Two decoupled antennas to suit in the short edge of the metal-framed smartphone with a continuous frame section of 72.4 mm (approximately 0.22λ at 900 MHz) are presented. The two conjoined-loop antennas are used for multi-input multi-output (MIMO) operation in the long-term evolution (LTE) low band for 880 MHz ~ 960 MHz. The two metal-frame MIMO an...
Article
A multi-polarized wideband circular patch antenna for multi-input multi-output (MIMO) operation in the fifth- generation (5G) band of 3300 MHz ~ 4200 MHz is presented for access-point applications. The circular patch antenna is excited by three probe feeds (Port 1 ~ Port 3) equally spaced by 120 ° to generate three different polarized waves in the...
Article
Full-text available
Conjoined dual antennas with an ultra‐wideband (UWB) of 2300‐6000 MHz for multi‐input multi‐output operation in the fifth‐generation (5G) tablet device is presented. The UWB covers not only the 5G band in 3300‐5000 MHz, but also the long term evolution high band in 2300‐2400/2500‐2690 MHz and the Wireless Fidelity band in 2400‐2500/5100‐5900 MHz. A...
Article
Full-text available
The metal‐frame long‐term evolution (LTE) antennas with a compact symmetric frame structure at the short edge of the metal‐framed smartphone are presented. The proposed metal‐frame antennas cover the LTE low band (LB) in 824~960 MHz and two LTE middle/high bands (M/HBs) in 1710~2690 MHz. The LTE LB antenna uses a short metal‐frame section of 41.8 m...
Article
Full-text available
Two coupled‐fed loop antennas with a conjoined capacitor‐embedded section to achieve compact size and high isolation for the fifth‐generation (5G) multi‐input multi‐output (MIMO) operation in the tablet device are presented. The two conjoined loop MIMO antennas cover the 5G band of 3300‐4200 MHz, which is considered to be the largest contiguous fre...
Article
Decoupled compact UWB multi‐input multi‐output (MIMO) antennas to cover 3300∼6000 MHz in the future smartphone applications are presented. The obtained UWB can cover the fifth‐generation (5G) mobile operation in 3300∼5000 MHz and 5GHz‐wireless wide area network (WLAN) operation in 5150∼5875 MHz to achieve seamless wireless internet access in future...
Article
An integrated triple‐inverted‐F antenna (TIFA) with 3 radiating strips and 2 hybrid (inductive and capacitive) shorting strips having a compact structure to provide a triple‐wideband operation in the smartphone for the fourth‐generation/fifth‐generation (4G/5G) communications is presented. The integrated TIFA can cover the 4G long‐term evolution lo...
Article
It is experimentally demonstrated that 20 multi‐input multi‐output (MIMO) antennas operated in 3.5‐GHz band (3400∼3600 MHz) with acceptable antenna performance and low envelope correlation coefficients (ECCs < 0.1) can be embedded in the smartphone for fifth‐generation (5G) or future mobile communications. Additionally, in a 20 × 12 MIMO system wit...
Article
Full-text available
Six antennas placed on the short edges of the metal-framed smartphone for the LTE (long-term evolution) MIMO (multi-input multi-output) operation are presented. The six-antenna structure comprises three antennas placed on the top edge of the smartphone and three antennas placed on the bottom edge thereof. The three antennas on the bottom edge are i...
Article
Two self‐decoupled, closely‐spaced, metal‐frame LTE MIMO antennas with compact frame lengths to fit in the short edge of the metal‐framed smartphone are presented. The 2 MIMO antennas include a first antenna covering the LTE low band (LB) in 824–960 MHz and LTE middle/high band (M/HB) in 1710–2690 MHz and a second antenna covering the LTE M/HB in 1...
Conference Paper
Full-text available
Two dual-feed U-shaped open-slot (U-slot) antennas are proposed for LTE MIMO operation. The two U-slot antennas (U-slot1 and U-slot2) are of same structures and dimensions, with each one providing two decoupled antennas to respectively cover 824~960/1710~2690 MHz for the LTE low/middle/high bands (L/M/HB) and 1710~2690 MHz for LTE middle/high bands...
Presentation
Full-text available
Two dual-feed U-shaped open-slot (U-slot) antennas are proposed for LTE MIMO operation. The two U-slot antennas (U-slot1 and U-slot2) are of same structures and dimensions, with each one providing two decoupled antennas to respectively cover 824~960/1710~2690 MHz for the LTE low/middle/high bands (L/M/HB) and 1710~2690 MHz for LTE middle/high bands...
Article
The conceptual design of a multiple input multiple output (MIMO) antenna system packaged within a metallic handset for future wireless communications is proposed, simulated, and implemented. The presented MIMO antenna system is composed of four-identical slotted microstrip magnetic dipoles. The whole antenna system is installed within an emulated h...
Article
Full-text available
A printed dual-feed U-shaped open-slot (U-slot) antenna disposed close to the top or bottom short edge of the system ground plane in the metal-framed smartphone for the LTE (long-term evolution) MIMO (multi-input multi-output) operation is presented. The U-slot is printed in the ground region within 10 mm to the short edge of the system ground plan...
Article
Integrated yet decoupled (IYD) dual antennas with inherent decoupling structures to achieve multi-input multi-output operation in the 2.4/5.2/5.8-GHz wireless local area network bands in the smartphone are presented. The IYD dual antennas consist of two coupled-fed loop antennas integrated into a compact planar structure of size 7 × 25 mm². Each co...
Article
With a large number of multi-input multi-output (MIMO) antennas embedded in the smartphone, much higher data throughput can be obtained for the smartphone in the MIMO operation. Furthermore, in order to be operational in heterogeneous networks, such as the mobile network and the wireless wide area network (WLAN), dual-band operation of the MIMO ant...
Article
A compact two-antenna building block for forming the multiple-input multiple-output (MIMO) array in the mobile device such as the smartphone is presented. The building block has a planar structure of small size 7 × 10 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (about 0.08λ × 0.12λ) for...
Article
A small-size frame antenna based on the inverted-F antenna (IFA) structure to cover 824∼960 and 1710∼2690 MHz for the LTE operation in the metal-casing smartphone is presented. The antenna uses a short frame section of 53 mm (about 0.16 wavelength at 900 MHz) along the short edge of the metal casing as the IFA's radiating strip. The short frame sec...
Article
The use of metal casing is attractive to achieve robustness of modern slim tablet devices. The metal casing includes the metal back cover and the metal frame around the edges thereof. For such metal-casing tablet devices, the frame antenna that uses a part of the metal frame as an antenna’s radiator is promising to achieve wide bandwidths for mobil...
Article
An on-frame gap-coupled half-loop antenna with a 3-mm narrow ground clearance disposed at the short edge (bottom or top edge) of the modern LTE smartphone is presented. The antenna has two gap-coupled half-loops (first and second half-loops) formed between an on-frame metal strip and the device ground plane in the smartphone. The on-frame metal str...
Article
Owing to the narrow regions along the four edges of the modern smartphone, especially the two narrow regions along the long (side) edges thereof, it has been a design challenge to embed the internal antennas therein. The design challenge is especially critical for embedding the long-term evolution (LTE) low-band antennas with operating frequencies...
Conference Paper
The handset or smartphone antenna has evolved from the external antenna before the year 2000 to the internal antenna and casing-integrated antenna for 2G/3G/4G communications till now. For the fifth-generation (5G) communications, it is expected that the Massive MIMO system is very promising for applications and a large number of MIMO antennas will...
Conference Paper
A hybrid open-slot/inverted-F antenna with a narrow ground clearance of 1.5 mm along the side edge of the LTE smartphone is presented. The hybrid antenna comprises an open-slot antenna (OSA) to cover the LTE low band (824∼960 MHz) and an inverted-F antenna (IFA) to cover the LTE high band (1710∼2690 MHz). Results of the proposed side-edge LTE anten...
Article
A very-low-profile hybrid antenna for the LTE smartphone was presented. The antenna structure was mainly formed by a T-shaped open slot disposed on the main circuit board inside the smartphone casing and a metallic patch printed on the inner surface of the frame around the smartphone casing. The antenna with the T-shape open slot and the on-frame m...
Conference Paper
A compact eight-antenna array in the smartphone for the 3.5-GHz band (3400 ∼ 3600 MHz) LTE 8 × 8 MIMO operation is presented. The eight-antenna array is formed by two quad-antenna arrays disposed along two long side edges of the system ground plane of the smartphone. The quad-antenna array occupies a small size of 1 × 60 mm 2 . For operating in an...
Conference Paper
Four LTE low-band MIMO antennas in the smartphone for applications in the 4 × 4 MIMO system are presented. The four antennas are based on the open-slot antenna structure and disposed along the short edges and the side edges of the smartphone. The two short-edge antennas cover 698∼960 MHz. The two side-edge antennas cover 824∼960 MHz. The four anten...
Article
A dual-loop antenna with a 1-mm ground clearance on the main circuit board and an on-frame metal patch for the 2.4/5.2/5.8-GHz multiband WLAN operation in the smartphone was presented. The metal patch was printed on the inner surface of the side-edge frame of the smartphone and has a simple rectangular shape of size 6 × 12.7 mm2. Multiband operatio...
Article
A multiband open-slot antenna formed by placing a sticker-like feed substrate (can also be a flexible printed-circuit board) with the microstrip feedline and circuit elements disposed thereon onto a simple linear open slot embedded in the metal casing of the modern smartphone is presented. The proposed design provides a simple and convenient method...
Article
A reconfigurable narrow-frame coupled-loop antenna capable of providing hepta-band long term evolution/wireless wide area network (LTE/WWAN) for metal-rimmed smartphone applications is proposed. The ground clearance of this proposed antenna is only 7 × 70 mm2 which is promising for narrow-frame smartphone applications. Moreover, this proposed anten...
Article
A small-size narrow open-slot antenna with 1-mm slot width and 12.7-mm slot length promising to be disposed in the narrow region along the side edge of the metal-framed smartphone for the 2.4/5.2/5.8-GHz WLAN operation is presented. This study exploits the narrow region between the display panel and the casing of the metal-framed smartphone to disp...
Conference Paper
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...
Article
A hybrid loop/monopole antenna capable of covering the LTE operation in the 698–960/1710–2690 MHz band and the GPS operation at 1575 MHz for the tablet computer application is presented. With the obtained LTE/GPS operation, the antenna requires a small size of 8 × 40 × 3 mm3 only. The antenna is operated as a coupled-fed loop antenna for the LTE op...
Article
Using the quad-antenna linear (QAL) array as a building block, the 8-antenna and 16-antenna arrays for the 3.5-GHz long term evolution multiple-input multiple-output (MIMO) operation in the smartphone are demonstrated. The QAL array has a planar structure of narrow width 3 mm (0.035λ) and short length 50 mm (0.58λ), with λ being the wavelength at 3...
Article
Full-text available
A hybrid antenna is proposed for future 4G/5G multiple input multiple output (MIMO) applications. The proposed antenna is composed of two antenna modules, namely, 4G antenna module and 5G antenna module. The 4G antenna module is a two -antenna array capable of covering the GSM850/900/1800/1900, UMTS2100, and LTE2300/2500 operating bands, while the...
Article
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 mm(2) 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...
Conference Paper
A 16-antenna array disposed in the smartphone for the LTE MIMO operation in the 3.5-GHz band (3400 ∼ 3600 MHz) is presented. The array is fabricated by disposing four quad-antenna linear (QAL) arrays along two long side edges of the system circuit board of the smartphone. The QAL array has a planar structure occupying a small area of 3 mm × 50 mm....
Article
An open-slot antenna with a low profile of 7 mm to provide a triple-wideband LTE operation in the metal-framed tablet device is presented. With the low profile, the antenna can fit in the narrow region between the metal frame and the display panel of the metal-framed tablet device. The triple-wideband operation covers 698-960 MHz (low band), 1710-2...
Article
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-...
Article
A hybrid dual-antenna formed by an inverted-F antenna (IFA) and an open-slot antenna (OSA) for the 3.6-GHz LTE operation (3.4–3.8 GHz) in the tablet computer is presented. The dual-antenna is printed on a 0.8-mm thick FR4 substrate and has a compact planar structure of 4 × 30 mm2. The dual-antenna comprises a clearance region wherein the IFA is dis...
Article
A low-profile open-slot antenna capable of providing a triple-wideband LTE operation for the metal-framed smartphone is presented. The antenna has a low profile of 7 mm and can fit in a narrow region between the metal frame and the display panel of the metal-framed smartphone. The antenna comprises three branch slots sharing a same opening disposed...
Article
A simple, decoupled dual‐inverted‐F antenna (DIFA) formed by two inverted‐F antennas (IFAs) with a decoupling chip inductor is presented. The open ends of the two IFAs face to each other and are connected by the decoupling chip inductor. The DIFA has a planar structure and is easily fabricated on a thin dielectric substrate. Good isolation between...
Article
A low-profile open-slot antenna for the LTE/WWAN operation in the tablet device, such as a smartphone or tablet computer is presented. The antenna consists of two inverted-L (IL) open slots, with one longer IL open slot for the low band of 698∼960 MHz and one shorter IL open slot for the high band of 1710–2690 MHz, and is referred to as a dual-inve...
Article
A 10-antenna array operating in the 3.6-GHz band (3400–3800 MHz) for multi-input multi-output (MIMO) operation in the smartphone is presented. Each antenna in the proposed array is a microstripline-fed open-slot antenna with same small dimensions of 3 × 8 mm2 (0.036λ × 0.096λ, λ is the wavelength at 3.6 GHz). The proposed array consists of two symm...
Article
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. T...
Conference Paper
A 10-antenna array operating in the 3.6-GHz band (3.4∼3.8 GHz) for the MIMO operation in the smartphone is presented. The array consists of two symmetric 5-antenna arrays disposed in the narrow spacing between the display panel and the long side edges of the smartphone. Acceptable isolation (better than about 10 dB) and good ECC of less than 0.1 fo...
Conference Paper
Two combined-type tablet device antennas for LTE dual-wideband and LTE triple-wideband operations are presented. For the triple-wideband LTE antenna, it is formed by combining an inverted-F antenna (IFA) to cover the LTE low band (698∼960 MHz) and a coupled-fed loop antenna to cover the LTE middle band (1710∼2690 MHz) and high band (3400∼3800 MHz)....
Article
A linear open slot antenna with two open ends for the dual-wideband LTE/WWAN operation in the 698–960 and 1710–2690 MHz bands is presented for the smartphone application. The proposed antenna is referred to as a dual-opening slot (DOS) antenna and is especially suitable for the modern slim tablet device, such as a 5.5-inch smartphone. The DOS anten...
Patent
Full-text available
A communication electronic device which comprises a grounding element and a slot antenna is provided. The slot antenna is formed by a feeding element, a first slot, a second slot, and a third slot. The first slot is an open slot, which has an open end at the first side edge and a closed end extended toward the interior of the electrical conductor....
Article
A combined-type triple-wideband tablet computer antenna covering the long term evolution (LTE) operation in the 698–960 MHz (low band), 1710–2690 MHz (middle band), and 3400–3800 MHz (high band) is presented. The antenna is formed by an inverted-F antenna (IFA) covering the LTE low band and a coupled-fed loop antenna covering the LTE middle and hig...
Article
A small-size dual-wideband monopole antenna for the long term evolution (LTE) operation in the tablet computer is presented. The antenna occupies a small ground clearance of 10 × 30 mm2 and is easy to implement by feeding a simple radiating portion through an inductive branch (inductor-loaded branch) and a capacitive branch (capacitor-loaded branch...
Article
A passive reconfigurable triple-wideband tablet computer antenna for the LTE operation in the low band of , middle band of , and high band of 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 a...
Patent
Full-text available
A mobile communication device includes an antenna structure having a dielectric substrate and an antenna. The dielectric substrate includes a ground portion, a first non-ground portion, and a second non-ground portion. The ground portion further includes a main ground and a protruded ground electrically connected to the main ground and extending be...
Article
A simple two-branch monopole antenna with an integrated wideband matching network to achieve the LTE dual-wideband operation (698–960/1710–2690 MHz) with a small occupied volume (10 × 30 × 3 mm3) in the tablet computer is presented. The two-branch monopole contributes to one resonant mode in the LTE low band and one resonant mode in the LTE high ba...
Article
A circuit-defined dual-wideband antenna for the LTE operation in the tablet computer is presented. The antenna occupies a small ground clearance of 10 × 30 mm2 and is easy to implement by feeding a simple radiating portion through an inductive branch (inductor-loaded branch) and a capacitive branch (capacitor-loaded branch). By further aided using...
Article
A small-size dual-antenna for the LTE operation in its high band of 1710∼2690 MHz is presented for the LTE tablet computer application. The dual-antenna occupies a small volume of 10 × 45 × 0.8 mm3. The dual-antenna provides acceptable isolation better than about 10 dB and good antenna efficiency better than about 55% over a wide operating band of...
Article
A simple two-branch monopole antenna with an integrated wideband matching network to achieve the LTE dualwideband operation (698∼960/1710∼2690 MHz) with a small occupied volume (10 × 30 × 3 mm3) in the tablet computer is presented. The two-branch monopole contributes to one resonant mode in the LTE low band and one resonant mode in the LTE high ban...
Article
A dual-wideband combined-type antenna with its lower wideband and higher wideband respectively contributed by two separate radiating portions thereof is presented. The two separate radiating portions (one low-band antenna and one high-band antenna) are easily combined into a compact structure for the LTE operation in the 698∼960 and 1710∼2690 MHz b...
Article
A very-low-profile (8 mm in height), small-size (8 × 3 × 40 mm3), and dual-wideband loop antenna suitable for applications in the LTE tablet device such as a tablet computer is presented. Dual-wideband operation of the proposed loop antenna is achieved using a wideband feed structure formed by a coupling feed, a high-pass matching circuit, and a tu...
Article
A small-size tablet device antenna with three wide operating bands of 698∼960 MHz, 1710∼2690 MHz and 3400∼3800 MHz for the LTE operation is presented. The antenna occupies a small ground clearance of 10 × 30 mm2 and has a thin thickness of 3 mm in the tablet device. The antenna comprises three radiating branches and a circuit-based wideband feed st...
Patent
Full-text available
A mobile communication device includes an antenna structure which includes a grounding element and an antenna element. There is a notch at an edge of the grounding element. The antenna element is disposed in the notch and includes a metal loop portion and a monopole antenna. The metal loop portion is electrically connected to the grounding element...
Article
A compact dual-antenna for the long term evolution (LTE) operation in its high band of 1710–2690 MHz is presented for the LTE tablet computer application. The dual-antenna occupies a small volume of 10 × 45 × 0.8 mm3 and comprises two back-to-back folded loops separated by a π-shape grounded strip. Each folded loop is directly fed to generate its h...
Article
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 la...
Patent
A communication device includes a system circuit board, a ground plane, a first antenna, a second antenna, a first metal element, and a second metal element. The ground plane is disposed on the system circuit board. The first metal element is substantially located between the first antenna and the second antenna. The first metal element is coupled...
Article
A combined-type dual-wideband antenna with its lower wideband and higher widebands, respectively, contributed by two separate radiating portions thereof is presented. The two separate radiating portions (one low-band antenna and one high-band antenna) are easily combined into a compact structure for the 2G/3G/4G operation in the 698–960 and 1710–26...
Conference Paper
A very-low-profile (8 mm in height), small-size (8 × 3 × 40 mm 3 ), and dual-wideband loop antenna suitable for applications in the LTE tablet computer is presented. Dualwideband operation is achieved using a wideband feed structure formed by a coupling feed, a high-pass matching circuit, and a tuning inductor. The coupling feed leads to successful...
Article
A small-size tablet device antenna with three wide operating bands of 698–960 MHz (low band), 1710–2690 MHz (middle band), and 3400–3800 MHz (high band) for the long term evolution operation is presented. The antenna occupies a small ground clearance of 10 × 30 mm2 and has a thin thickness of 3 mm in the tablet device such as a tablet computer in t...
Patent
Full-text available
A dual-band mobile communication device includes a ground plane and an antenna located on a dielectric substrate and including a feeding portion and a shorted radiating portion. One end of the feeding portion is a feeding point of the antenna. A length of the shorted radiating portion is at least twice that of the feeding portion. A first end of th...
Patent
Full-text available
A communication device includes a ground element, an antenna element, and a reconfigurable circuit element group. The antenna element includes a first radiating portion and a second radiating portion. One end of the first radiating portion is a feeding end of the antenna element, and the other end is an open end. One end of the second radiating por...
Patent
A communication device including an antenna structure is provided, wherein the antenna structure includes a ground element, an antenna element, and a circuit element group. The ground element has a notch at one of its edges, and a long edge of the notch is at least two times longer than a short edge of the notch. The antenna element includes a meta...
Patent
Full-text available
The present invention is related to a MIMO (multi-input multi-output) mobile communication device. The mobile communication device comprises a dielectric substrate and a MIMO antenna set. The dielectric substrate comprises a ground portion, a first no-ground portion and a second no-ground portion. The ground portion further comprises a main ground...
Article
A simple two-strip antenna formed by a driven strip and a shorted parasitic strip to provide two wid