Chip Antenna(天线设计).pdf-资料库

Application Note AN048 Compact Reach XtendTM Bluetooth®, 802.11b/g WLAN Chip Antenna Antenna Part Number FR05-S1-N-0-102 SWRA092B Page 1 of 12

Application Note AN048 Table of Contents NOTES ............................................................................................................................ 3 1 ANTENNA DESCRIPTION ............................................................................................. 4 2 QUICK REFERENCE GUIDE*.................................................................................................. 4 3 ANTENNA PERFORMANCE ......................................................................................... 5 VSWR & RADIATION EFFICIENCY ............................................................................... 5 RADIATION PATTERN.................................................................................................. 6 GAIN ......................................................................................................................... 7 MECHANICAL CHARACTERISTICS ............................................................................ 8 PCB FOOTPRINT DETAILS .......................................................................................... 8 DIMENSIONS AND TOLERANCES .................................................................................. 9 ASSEMBLY PROCESS ................................................................................................. 9 PACKAGING ............................................................................................................. 11 GENERAL INFORMATION .......................................................................................... 12 DOCUMENT HISTORY................................................................................................ 12 3.1 3.2 3.3 4.1 4.2 4.3 4.4 5.1 4 5 SWRA092B Page 2 of 12

Application Note AN048 1 Notes • The antenna product described in this document is protected by at least one of the following Patents and Patent Applications owned by Fractus: WO0154225, WO0122528, PCT/EP01/10589, PCT/EP02/07837, US60/613394, US60/627653 and PCT/EP02/07836. • The configuration recommended in this document for the Compact Reach XtendTM chip antenna can be applied to the following proprietary and ZigBeeTM ready transceivers and CC2400/2420/2430/CC2431/2500/CC2510/CC2511/CC2550/ transmitters: CC2520/CCZACC06. • All information contained within this document is property of Fractus and is subject to change without prior notice. Information is provided “as is” and without warranties. It is prohibited to copy or reproduce this information without prior approval. SWRA092B Page 3 of 12

Application Note AN048 Antenna Description 2 The Fractus® Compact Reach XtendTM chip antenna is engineered specifically for devices operating at 2.4 GHz. Compact Reach XtendTM combines small size with high performance to improve the functionality of wireless devices. Chipcon has selected the Fractus 50 Ω single- ended Compact Reach XtendTM chip antenna to ensure high performance, minimal power consumption, and small dimensions for a USB dongle including the CC2400. Both Chipcon and Fractus have worked together to optimise integration and cost for Chipcon’s reference design customers. The Compact Reach XtendTM chip antenna uses space-filling properties of fractal technology to minimise its size while maintaining a high radiation efficiency value. This directly impacts antenna reliability in achieving a greater communication range (distance) and in improving battery life. Compact Reach XtendTM features an omni-directional radiation pattern optimal for highly scattered environments such as indoor environments and public spaces. The broad bandwidth achieved by the Compact Reach XtendTM chip antenna allows the flexibility to easily integrate the antenna in many PCB configurations independently of the plastic housing and electronic components surrounding the antenna. 3 mm 2 mm 7 mm Front Back BENEFITS • High efficiency • Small form factor • Cost-effective • Small clearance needed • Easy-to-use if you your contact sales Please at Richardson representative Electronics require additional information on antenna integration or optimisation on your PCB. RICHARDSON ELECTRONICS FRACTUS S.A. wireless@fractus.com www.fractus.com Tel: +34 935442690 Fax: +34 935442691 QUICK REFERENCE GUIDE* Frequency range Radiation Efficiency Peak Gain VSWR Polarization Weight Temperature Impedance Dimensions 2400-2500 MHz > 50% > 0 dBi < 2:1 Linear 0.1 g -40 to + 85ºC 50Ω 7x3x2 mm (*) Results measured on a USB dongle including the CC2400 (50x15mm). SWRA092B Page 4 of 12

Application Note AN048 Antenna Performance 3 This section provides integration and mounting recommendations for the use of the Compact Reach XtendTM Chip Antenna within the CC2400 USB dongle. Compact Reach XtendTM has been designed to purposely minimise product integration efforts and optimise device performance. This Application Note provide you with both the performance of the USB dongle with standard plastic housing and the PCB details necessary to implement the antenna on a client’s board. 3.1 VSWR & Radiation Efficiency R R W W S S V V 5 5 4.5 4.5 4 4 3.5 3.5 3 3 2.5 2.5 2 2 1.5 1.5 1 1 2 2 With housing With housing With housing Without housing Without housing Without housing 2.1 2.1 2.2 2.2 2.3 2.3 2.4 2.4 2.5 2.5 2.6 2.6 2.7 2.7 2.8 2.8 2.9 2.9 3 3 Frequency [GHz] Frequency [GHz] a) With housing With housing Without housing Without housing 100 100 90 90 80 80 70 70 60 60 50 50 40 40 30 30 20 20 10 10 ) ) % % ( ( y y c c n n e e i i c c i i f f f f E E 0 0 2 2 2.1 2.1 2.2 2.2 2.3 2.3 2.4 2.6 2.4 2.6 Frequency (GHz) Frequency (GHz) 2.5 2.5 2.7 2.7 2.8 2.8 2.9 2.9 3 3 b) Figure 1: Electrical Performance of Compact Reach XtendTM on TI’s CC2400 USB Dongle a) VSWR and b) Radiation efficiency Without the need of any matching network the Compact Reach XtendTM chip antenna achieves VSWR<2 within the ISM 2.4 GHZ band on the CC2400 USB Dongle. That ensures at least 90% of the power to be delivered to the antenna and thus minimizes a) battery consumption at both sides when used in battery-operated applications (e.g. Laptops and wireless keyboard & mouse) and b) BoM cost. In addition to that, the bandwidth for which VSWR<2.5 reaches 400 MHz, which allows flexibility to adapt the antenna to different PCB and plastic housing configurations. Based on our experience, Fractus recommends to use plastic housing of conventional ABS material to be implemented no closer than 2mm from the top part of the antenna and 2mm also from the PCB bottom side (configuration used for measurements in figure 1). More than 50% of the power delivered to the antenna is being transmitted to the free space. This is a very high value that will increase communication reliability and prolong the battery life of e.g. a wireless keyboard and mouse. SWRA092B Page 5 of 12

Application Note AN048 3.2 Radiation Pattern Figure 2: Radiation Pattern for Azimuth (a) and Elevation Cuts (b and c) SWRA092B Page 6 of 12

Application Note AN048 3.3 Gain In conventional configurations, a USB device will typically be connected to a PC standing on the right side of user’s feet (below table). In such case, both a wireless keyboard and mouse will be located at Theta=0º and Phi ranging from –45º to +45º. The Compact Reach XtendTM chip antenna used in the CC2400 USB Dongle achieves very high gain values (green circle on left side picture) [0dBi, -0,5 dBi], which will increase link reliability and maximise data transfer success. Phi (φ) Figure 3: Gain [dBi] Projected in 2D Plot from a 3D Measurement SWRA092B Page 7 of 12

Application Note AN048 4 Mechanical Characteristics 4.1 PCB Footprint Details All dimensions listed in millimetres. Letter A B C D E F G H I J K Meas. 7.00 3.00 1.50 0.20 2.60 3.60 2.00 0.50 3.75 1.50 15.00 Zone occupied by the antenna Soldering pads, feed point and feeding line PCB border (no ground-plane) PCB ground-plane Figure 4: Footprint Details on the CC2400 USB Dongle Fractus can support customisation of this PCB footprint for your specific device needs and optimise the antenna performance within your specific device. SWRA092B Page 8 of 12

资料库

Chip Antenna(天线设计).pdf

相关推荐

最新资料