Ting-Chih Tseng

Bio: Ting-Chih Tseng is an academic researcher from National Sun Yat-sen University. The author has contributed to research in topics: Antenna (radio) & Omnidirectional antenna. The author has an hindex of 4, co-authored 7 publications receiving 138 citations.

Thin internal GSM/DCS patch antenna for a portable mobile terminal

Abstract: A novel internal dual-band patch antenna with a small thickness of 3 mm for application in Global System for Mobile Communication/Digital Communication System (GSM/DCS) mobile terminals such as the mobile phone or Personal Digital Assistant (PDA) phone is presented. The patch antenna occupies an area of 15/spl times/60 mm/sup 2/, with its top patch embedded with a simple T-shaped slit, which separates the top patch into two resonant paths to generate two resonant modes for 900/1800 MHz operation. Then, by extending a small portion of the top patch beyond the top edge of the system ground plane of the mobile terminal, the antenna can provide two wide bandwidths covering the GSM/DCS bands. The proposed antenna is experimentally studied, and effects of the extended top-patch portion and the ground-plane length on the obtained bandwidths are discussed.

Low-profile ultra-wideband antenna for mobile phone applications

Abstract: A novel low-profile ultra-wideband (UWB) antenna suitable for mobile-phone applications as an internal antenna is presented. The proposed antenna mainly comprises a planar metal-plate monopole folded into a low-profile structure and a matching tuning portion for achieving a very wide operating bandwidth (about 1.89–10.14 GHz in this study). With the very wide bandwidth obtained, the proposed antenna can easily cover the UMTS (1920–2170 MHz) band for mobile communications and the 2.4-GHz (2400–2484 MHz) and 5.2/5.8-GHz (5150–5350/5725–5875 MHz) bands for WLAN communications. Characteristics of the proposed UWB antenna applied to a UMTS/WLAN mobile phone are presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 7–9, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20358

High‐gain printed dipole antenna

Abstract: A printed dipole antenna showing high gain (about 6.8 dBi) radiation in the azimuthal plane is presented. The dipole antenna has a narrow width of 10 mm and a total length of about 202 mm (with 1.64 wavelengths of the frequency at 2442 MHz, the center frequency of the 2.4-GHz WLAN band). In each one of the two radiating arms of the dipole antenna, a meandered line is inserted as a phase-reversal device. With this arrangement, the proposed dipole antenna performs as a collinear array antenna with three in-phase half-wavelength radiating elements, leading to constructive radiation in the azimuthal plane and small side lobes in the elevation plane. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 214–218, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20948

High-gain omnidirectional printed collinear antenna

Abstract: A printed collinear antenna with a narrow (10 mm) width showing high-gain omnidirectional radiation is presented. The antenna comprises three half-wavelength elements of one strip dipole, one meandered line, and one straight strip connected in series, and has a total height of only 113.5 mm (about 92% wavelength of the frequency at 2442 MHz) for operation in the 2.4-GHz WLAN band. Due to the meandered line, in which the excited surface current has a phase opposite to that of the strip dipole and straight strip, the destructive radiation in the azimuthal plane for the antenna is suppressed. Conversely, the strip dipole and straight strip are constructive with regard to radiation, which leads to high-gain omnidirectional radiation for the antenna. A prototype showing good omnidirectional radiation (with gain variations less than 1.5 dB in the azimuthal plane) with a high gain level of about 4.4 dBi across the 2.4-GHz WLAN band is presented. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 348–351, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20631

High-gain omnidirectional planar monopole antenna

Abstract: The present invention is related to a high-gain omnidirectional planar monopole antenna and mainly comprises a ground plane, a radiating metal line, and a feeding coaxial line The ground plane is substantially of a rectangular shape The radiating metal line is composed of a first metal line, a second metal line, and a third metal line The first metal line has a length of about 025 wavelength of the antenna's central operating frequency and is with a distance of less than 3 mm to the ground plane The second metal line has a length of about 05 wavelength of the antenna's central operating frequency and is in the form of a meandered line, whose two ends are connected to the first and third metal lines, respectively The third metal line has a length of about 05 wavelength of the antenna's central operating frequency The feeding coaxial line is for signal transmission The present invention is suitable for application in the 24 GHz WLAN band for providing high-gain omnidirectional radiation characteristics

Printed Monopole Slot Antenna for Internal Multiband Mobile Phone Antenna

Abstract: A new internal multiband mobile phone antenna formed by two printed monopole slots of different lengths cut at the edge of the system ground plane of the mobile phone is presented. The antenna can generate two wide bands centered at about 900 and 2100 MHz to cover the GSM850/GSM900/DCS/PCS/UMTS bands and the 2.4-GHz WLAN band. Further, the antenna has a simple planar structure and occupies a small area of only. It is also promising to bend the antenna into an L shape to reduce its volume occupied inside the mobile phone. Good radiation characteristics are obtained over the two wide operating bands.

Printed $\lambda/8$ -PIFA for Penta-Band WWAN Operation in the Mobile Phone

Abstract: A small-size printed planar inverted-F antenna (PIFA) operated at its one-eighth wavelength (lambda/8) mode as the fundamental resonant mode for achieving WWAN (wireless wide area network) operation in the mobile phone is presented. The proposed PIFA has a simple structure of comprising two radiating strips of length about lambda/8 at 900 MHz and is fed using a coupling feed. Compared to the traditional PIFA using a direct feed, the coupling feed greatly decreases the very large input impedance seen at the lambda/8 mode for the traditional PIFA and results in successful excitation of the lambda/8 mode for the proposed PIFA. Two lambda/8 modes are generated by the two radiating strips and occur at close frequencies at about 900 MHz to form a wide lower band to cover GSM850/900 operation. The two radiating strips also generate two higher-order modes or lambda/4 modes at about 1900 MHz to form a wide upper band for GSM1800/1900/UMTS operation. Penta-band WWAN operation is hence achieved, yet the proposed PIFA only occupies a small printed area of 15times31 mm2 or 465 mm2 on the system circuit board of the mobile phone, which is about the smallest for the internal uniplanar printed antenna capable of penta-band operation that have been reported. Details of the proposed PIFA are presented. The specific absorption rate (SAR) and hearing aid compatibility (HAC) results for the proposed PIFA are also analyzed.

Quarter-Wavelength Printed Loop Antenna With an Internal Printed Matching Circuit for GSM/ DCS/PCS/UMTS Operation in the Mobile Phone

Abstract: A small-size printed loop antenna with an internal printed matching circuit capable of GSM/DCS/PCS/UMTS operation in the mobile phone is proposed. The antenna comprises an 85-mm long folded loop strip and an internal printed matching circuit encircled therein and formed by a coupling strip and an inductive strip. The loop strip is excited by the coupling strip to generate a 0.25 lambda resonant mode at about 900 MHz for GSM operation. For the inductive strip, it effectively causes a wideband higher order mode at about 1900 MHz for DCS/PCS/UMTS operation. Further, the antenna shows a uniplanar structure and requires a very small printed area of 170 mm2 on the system circuit board of the mobile phone, making it easy to fabricate at low cost. Details of the proposed antenna and its radiation performances including the SAR (specific absorption rate) results are studied.

Planar Monopole With a Coupling Feed and an Inductive Shorting Strip for LTE/GSM/UMTS Operation in the Mobile Phone

Abstract: A planar monopole having a small size yet providing two wide bands for covering the eight-band LTE/GSM/UMTS operation in the mobile phone is presented. The small-size yet wideband operation is achieved by exciting the antenna's wide radiating plate using a coupling feed and short-circuiting it to the system ground plane of the mobile phone through a long meandered strip as an inductive shorting strip. The coupling feed leads to a wide operating band to cover the frequency range of 1710-2690 MHz for the GSM1800/1900/UMTS/LTE2300/2500 operation. The inductive shorting strip results in the generation of a wide operating band to cover the frequency range of 698-960 MHz for the LTE700/GSM850/900 operation. The planar monopole can be directly printed on the no-ground portion of the system circuit board of the mobile phone and is promising to be integrated with a practical loudspeaker. The antenna's radiating plate can also be folded into a thin structure (3 mm only) to occupy a small volume of 3 × 6 × 40 mm3 (0.72 cm3) for the eight-band LTE/GSM/UMTS operation; in this case, including the 8-mm feed gap, the antenna shows a low profile of 14 mm to the ground plane of the mobile phone. The proposed antenna, including its planar and folded structures, are suitable for slim mobile phone applications.

Compact Multiband Folded Loop Chip Antenna for Small-Size Mobile Phone

Abstract: A multiband folded loop chip antenna with a very small volume of 1 cm3 (40 times 5times 5 mm3) is presented. The antenna has a simple metal pattern comprising a folded loop strip and a tuning pad, and is especially suited for application in small-size mobile phones (groundplane length 60 mm only) for multiband operation. The metal pattern is attached on the surfaces of a foam base, and the first three resonant loop modes (0.5-, 1.0-, and 1.5-wavelength modes) of the antenna can be excited with good impedance matching by simply adjusting proper dimensions of the tuning pad and its location along the folded loop strip. The excited 0.5-wavelength mode forms as the antenna's lower band at about 900 MHz for GSM operation, while the 1.0- and 1.5-wavelength modes are formed into a wide operating band at about 1900 MHz for the antenna's upper band to cover DCS/PCS/UMTS operation. Design considerations of the proposed folded loop chip antenna are described, and effects of the tuning pad on controlling the performances of the antenna are shown.