Liang-Che Chou

Dual-band flat-plate antenna with a shorted parasitic element for laptop applications

A novel dual-band flat-plate antenna with a shorted parasitic element for an internal laptop antenna for WLAN operation is presented. The proposed antenna is suitable to be integrated with the supporting metal frame for the display of the laptop and shows a low profile of 5 mm above the metal frame, thus making it easily embedded within the casing of the laptop as an internal antenna. Moreover, the proposed antenna can provide two separate impedance bandwidths of 190 MHz (about 8% centered at 2.4 GHz) and 2140 MHz (about 39% centered at 5.5 GHz), making it easily cover the required bandwidths for WLAN operation in the 2.4 GHz band (about 3.4% bandwidth required) and 5.2/5.8 GHz bands (about 13% bandwidth required). The proposed antenna is studied in detail in this study, and experimental and simulation results are presented.

Uni-Planar Dual-Band Monopole Antenna for 2.4/5 GHz WLAN Operation in the Laptop Computer

A novel uni-planar dual-band monopole antenna capable of generating two wide bands for 2.4/5 GHz WLAN operation is presented. The antenna has a simple structure consisting of a driven strip and a coupled shorted strip. The antenna occupies a small area of 6 times 20 mm2 on an FR4 substrate. The small area allows the antenna to be easily employed in the narrow space between the top edge of the display panel and the casing of the laptop computer to operate as an internal antenna. It is believed that the size of the antenna is about the smallest among the existing uni-planar internal laptop antennas for 2.4/5 GHz WLAN operation.

Coupled-Fed Shorted Monopole With a Radiating Feed Structure for Eight-Band LTE/WWAN Operation in the Laptop Computer

A coupled-fed shorted monopole with its feed structure as an effective radiator for eight-band LTE/WWAN (LTE700/GSM850/900/1800/ 1900/UMTS/LTE2300/2500) operation in the laptop computer is presented. The radiating feed structure capacitively excites the shorted monopole. The feed structure mainly comprises a long feeding strip and a loop feed therein. The loop feed is formed at the front section of the feeding strip and connected to a 50-Ω mini-cable to feed the antenna. Both the feeding strip and loop feed contribute wideband resonant modes to combine with those generated by the shorted monopole for the desired eight-band operation. The antenna size above the top shielding metal wall of the laptop display is 4 × 10 × 80 mm3 and is suitable to be embedded inside the casing of the laptop computer. The proposed antenna is fabricated and tested, and good radiation performances of the fabricated antenna are obtained.

Bandwidth Enhancement of the Small-Size Internal Laptop Computer Antenna Using a Parasitic Open Slot for Penta-Band WWAN Operation

By embedding a parasitic open slot in the antenna ground of a small-size internal laptop computer antenna, enhanced bandwidth for the antennas lower band to cover the GSM850/900 operation (824-960 MHz) can be achieved. The internal laptop computer antenna in this study is a small-size coupled-fed shorted T-monopole, whose length along the top edge of the display ground of the laptop computer is 43 mm only. The antenna can also provide a wide upper band to cover the GSM1800/1900/UMTS operation (1710-2170 MHz). With the inclusion of the parasitic open slot, the total antenna length along the top edge of the display ground is 48 mm only, and the occupied antenna volume is 10 × 3.5 × 48 mm3 above the top edge of the display ground, which is the smallest for the internal penta-band WWAN laptop computer antenna that have been reported for the present. Detailed results of the proposed parasitic open slot on bandwidth enhancement of the internal WWAN laptop computer antenna are presented.

A small-size internal dual-band metal-strip antenna for 2.4/5 GHz WLAN operation in the laptop computer

This paper presents a novel small-size dual-band metal-strip antenna promising to operate as an internal laptop antenna for WLAN operation in the 2.4 and 5 GHz bands has been proposed, fabricated and tested. The antenna is especially suited to be employed in the narrow spacing between the top edge of the display panel and the casing of the laptop computer. The antenna is formed by using two inverted-L metal strips, including one driven strip and one parasitic shorted strip, stacked together to achieve a compact configuration, which is different from the traditional shorted T-shaped monopole antenna or planar inverted-F antenna. This compact configuration leads to a small lateral length of 20 mm for the proposed antenna. The antennapsilas two resonant modes can be easily fine-adjusted to cover the desired operating bands. For the fabricated prototype studied in the paper, good radiation characteristics over the 2.4 and 5 GHz bands have been obtained. It is perspective that the proposed antenna will become a promising internal antenna for 2.4/5 GHz WLAN operation for laptop computer applications.

Embedded DTV antenna for laptop application

A novel embedded DTV antenna for application in laptops has been proposed and studied. The proposed antenna can provide a wide operating bandwidth for DTV signal reception in the UHF band. In addition, the proposed antenna has a narrow width of 10 mm only, thereby making it very promising to be embedded within the spacing between the display and the casing of the laptop to operate as an embedded antenna. The proposed antenna also shows good radiation characteristics for frequencies across the operating band.

Compact coupling-type antenna for WLAN/WiMAX operation in the laptop computer

Conventional printed or metal-plate antennas have been applied in laptop computers [1]-[3] and are usually embedded in narrow spaces (usually less than or about 10 mm) between the casing of the laptop computer and the supporting metal frame of the display as internal antennas. For WLAN operation, the operating range is mainly limited to be about 100 meter. By incorporating the existing WLAN system with the new communication system of WiMAX (worldwide interoperability for microwave access) [4], which can provide a long operating range of up to about 30 miles with a high data rate of about 75 Mb/s for mobile broadband wireless access, seamless Internet access for wireless users becomes possible.

Integrated wideband metal-plate antenna for WLAN/WMAN operation for laptops

In this paper we propose a new wideband metal-plate antenna capable of generating a wide operating bandwidth to cover the 2.4/5.2/5.8 GHz operations. In a similar way to the flat-plate or bent metal-plate antennas, the proposed antenna has a low profile and is suitable to be used as an internal or integrated antenna for laptop computers. Moreover, in addition to cover the 2.4/5.2/5.8 GHz bands for the existing WLAN systems, the antenna is also suitable for application in the new broadband wireless metropolitan area network (WMAN) system for mobile broadband wireless access in the 2.3 to 5.85 GHz band.

Internal laptop antenna with a wideband coupled ring for WLAN/WiMAX operation

Wireless internet access technology is rapidly developed in our modern life. A recent communication system of Worldwide Interoperability for Microwave Access (WiMAX) provides wider signal covering range than Wireless Local Area Network (WLAN) system. Laptop, the representation of portable computer, has to be equipped with antennas [1]-[2] for not only WLAN but also WiMAX operation system in one combo module for a dual-network operation system. Also, LEDLCD display for laptop application with thin fringe or fringeless design has become a tendency for borderless eyesight. Therefore, pursuing wideband operation and compact size has become a target for the antenna design.

Planar compact WWAN Antenna for Netbook/eBook applications

A planar compact WWAN Antenna for Netbook/eBook applications is presented. By inserting an additional parasitic open slot under the shorted-T monopole, bandwidth for the antennas both lower and upper bands can be enhanced to cover full band for GSM850/900/1800/1900/UMTS operation (824 – 960 MHz and 1710 – 2170 MHz). Smooth variation for the radiation pattern in each applicable frequency is seen in the study. Mounted aside the system ground plane, the antenna printed on the PCB as planar structure takes the area of 50 × 10 mm2, which is the most compact planar WWAN antenna so far. Detailed analysis and results of the proposed planar compact WWAN antenna for Netbook/eBook applications are presented.