Shun-Tian Lin

Compact Multibranch Inverted-F Antenna to be Embedded in a Laptop Computer for LTE/WWAN/IMT-E Applications

A multibranch inverted-F antenna with multiband operations for long-term evolution (LTE), pentaband wireless wide area network (WWAN) and IMT-E (2.6 GHz) applications is presented. The antenna consists of multibranch strips and is fabricated on a direct bond copper (DBC) substrate, which has a compact size of 96 (L) × 11.2 (W) × 0.5 (H) mm3 to be embedded in the laptop computer as an internal antenna. Three operating bands covering 663-993, 1689-2190, and 2449-2783 MHz for the LTE, GSM850/900 and DCS/PCS/UMTS, and IMT-E systems are achieved with good radiation efficiencies. The proposed antenna can be embedded in the laptop computer for the LTE, WWAN, and IMT-E applications.

A Compact Multiband Inverted-F Antenna for LTE/WWAN/GPS/WiMAX/WLAN Operations in the Laptop Computer

An inverted-F antenna with multiband operations for Long-Term Evolution (LTE700/2300/2500), wireless wide area network (WWAN), GPS, WiMAX (2.3/2.5/3.5 GHz), and WLAN (2.4 GHz) applications is presented. The antenna consists of multibranch strips and is fabricated on both sides of an Al2O3 ceramic substrate, which has a compact size of 97 (L) × 11.2 (W) × 0.5 (T) mm3 to be embedded inside the laptop computer as an internal antenna. Four operating bands covering 646-983, 1503-1589, 1696-2963, and 3396-3646 MHz for the LTE, WWAN, GPS, WiMAX (2.3/2.5/3.5 GHz) and WLAN (2.4 GHz) systems are achieved with good radiation efficiencies.

A compact inverted-F antenna to be embedded in ultra-thin laptop computer for LTE/WWAN/WiMAX/WLAN applications

A compact inverted-F antenna with multiband operations for LTE, WWAN, WiMAX and WLAN applications is presented. The antenna consists of multi-branch strips and is fabricated on both sides of the ceramic substrate, which has a compact size of 90(L)×10(W)×0.5(T) mm3 to be embedded inside an ultra-thin laptop computer as an internal antenna. Three operating bands covering 673–993 MHz, 1673–3153 MHz and 3316–3603 MHz for the LTE700/2300/2500, WWAN, WiMAX (2.3/2.5/3.5 GHz) and WLAN (2.4 GHz) systems are achieved with good radiation efficiencies.

A miniature chip antenna without empty space on PCB for 2.4GHz ISM band applications

For 2.4 GHz ISM band applications, such as Bluetooth and WLAN communication systems, an antenna effective in both radiation performance and space requirement is a critical part of the portable devices. Antennas used in the portable devices need to be compact, low-cost, efficient, and omni-directional for commercial applications. Thus, a miniature chip antenna without an empty area for 2.4 GHz ISM band applications is proposed in this paper. As shown in Fig. 1, the dimensions of this chip antenna are only 10(L)x3(W)x3.5(H) mm3, fabricated on an FR4 substrate, so that it can be easily installed inside the portable devices. Particularly, the empty area usually needed by using other built-in antennas is not required with our chip antenna. Thus, circuit routing on a multi-layer PCB will not be restricted due to the antenna, and circuit components can even be placed near the antenna. Therefore, the PCB space can be used more efficiently to miniaturize the RF device, and the antenna can be built in the device more flexibly.

A planar chip antenna for UWB applications in lower band

The key characteristics of the planar UWB chip antenna are summarized in the following: This chip antenna has a low profile, light weight, and compact size. Antenna patterns are omnidirectional, linearly polarized and with high efficiency. The input has 50Omega characteristic impedance and is impedance-matching free with a wide bandwidth. It can be surface-mounted for a compact SMD package. With the LCP insert molding technology, this chip antenna is highly stable with variations in temperature and humidity, and also very cost-effective to have superior performances for applications in the lower commercial band of the UWB system. This chip antenna can be embedded in a variety of portable devices.

A miniature GPS planar chip antenna integrated with low noise amplifier1

A planar chip antenna integrated with a low noise amplifier (LNA) for GPS applications at 1.575 GHz is presented in this paper. Software packages, XFDTD and HFSS have been applied to design the chip antenna having dimensions of 10 mm (L) times 8 mm (W) times 0.8 mm (H). An insert molding approach is applied to manufacture the antenna, where meandered metal strips are enclosed with liquid crystal polyester (LCP) to form the chip antenna. Thus, this chip antenna comprises a radiating structure of multiple meandered conducting strips packed with an LCP dielectric composite material to achieve size, performance characteristics and cost effectiveness superior to conventional GPS ceramic patch antennas. The compact surface-mount chip antenna is fully compatible with hand- and reflow- attachment processes. Also, no additional impedance-matching circuit is required so that the occupied length of the antenna built in a GPS receiver operating at 1.575 GHz is just 10 mm.