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智能天線技術(shù)在基站中的應(yīng)用

為了能夠滿足基站易于選址、優(yōu)質(zhì)快速的建站要求和易維護(hù)、低成本、高可靠的運(yùn)行要求，本文對(duì)以方艙來(lái)實(shí)現(xiàn)一體化結(jié)構(gòu)基站做出一番探討。從系統(tǒng)設(shè)計(jì)的觀點(diǎn)闡述了移動(dòng)通信高性能基站天線設(shè)計(jì)的幾個(gè)關(guān)鍵問(wèn)題，介紹了智能天線技術(shù)在基站中的應(yīng)用，并且用HFSS軟件仿真了一種新型的對(duì)稱陣子天線，該天線駐波比小于2的帶寬可以達(dá)到60%，具有良好的寬頻帶特性。 Abstract: In order to meet the station construction requirement of easy site selection and fast base station， and meet the operational requirement of easy maintenance， low cost and high reliability， this paper discussed the unified architecture base station using shelter. Several key problems of high performance mobile communication base station antenna were illustrated from the view of system design， the application of smart antenna in base station was also introduced. And a novel dipole antenna was simulated by using HFSS， the VSWR of the antenna is less than 2， and the bandwidth was reach to 60%. So it has good broadband properties.

標(biāo)簽： 智能天線基站中的應(yīng)用

上傳時(shí)間： 2013-11-20

上傳用戶：linlin
基于（英蓓特）STM32V100的串口程序

This example provides a description of how to use the USART with hardware flowcontrol and communicate with the Hyperterminal.First, the USART2 sends the TxBuffer to the hyperterminal and still waiting fora string from the hyperterminal that you must enter which must end by '\r'character (keypad ENTER button). Each byte received is retransmitted to theHyperterminal. The string that you have entered is stored in the RxBuffer array. The receivebuffer have a RxBufferSize bytes as maximum. The USART2 is configured as follow: - BaudRate = 115200 baud - Word Length = 8 Bits - One Stop Bit - No parity - Hardware flow control enabled (RTS and CTS signals) - Receive and transmit enabled - USART Clock disabled - USART CPOL: Clock is active low - USART CPHA: Data is captured on the second edge - USART LastBit: The clock pulse of the last data bit is not output to the SCLK pin

標(biāo)簽： V100 STM 100 32V

上傳時(shí)間： 2013-10-31

上傳用戶：yy_cn
mm to mil tool_mm轉(zhuǎn)mil轉(zhuǎn)換工具

mm to mil tool,mm to mil tool_mm轉(zhuǎn)mil轉(zhuǎn)換工具

標(biāo)簽： mil tool_mm mm to

上傳時(shí)間： 2013-10-31

上傳用戶：515414293
mm to mil tool_mm轉(zhuǎn)mil轉(zhuǎn)換工具

mm to mil tool,mm to mil tool_mm轉(zhuǎn)mil轉(zhuǎn)換工具

標(biāo)簽： mil tool_mm mm to

上傳時(shí)間： 2013-11-14

上傳用戶：crazyer
USB TO RS232 RS485 UART轉(zhuǎn)接板電路原理圖

USB TO RS232 RS485 UART轉(zhuǎn)接板電路原理圖

標(biāo)簽： RS UART USB 232

上傳時(shí)間： 2013-10-22

上傳用戶：macarco
談集成電路的通用接口

Abstract: How can an interface change a happy face to a sad face? Engineers have happy faces when an interface works properly.Sad faces indicate failure somewhere. Because interfaces between microprocessors and ICs are simple—even easy—they are oftenignored until interface failure causes sad faces all around. In this article, we discuss a common SPI error that can be almostimpossible to find in a large system. Links to interface tutorial information are provided for complete information. Noise as a systemissue and ICs to minimize its effects are also described.

標(biāo)簽： 集成電路通用接口

上傳時(shí)間： 2013-11-18

上傳用戶：zgz317
SL811開(kāi)發(fā)資料_包含源程序_電路圖_芯片資料

SL811開(kāi)發(fā)資料_包含源程序_電路圖_芯片資料:SL811HS Embedded USB Host/Slave Controller.The SL811HS is an Embedded USB Host/Slave Controller capable of communicate with either full-speed or low-speed USB peripherals. The SL811HS can interface to devices such as microprocessors, microcontrollers, DSPs, or directly to a variety of buses such as ISA, PCMCIA, and others. The SL811HS USB Host Controller conforms to USB Specification 1.1.The SL811HS USB Host/Slave Controller incorporates USB Serial Interface functionality along with internal full-/low-speed transceivers.The SL811HS supports and operates in USB full-speed mode at 12 Mbps, or at low-speed 1.5-Mbps mode.The SL811HS data port and microprocessor interface provide an 8-bit data path I/O or DMA bidirectional, with interrupt support to allow easy interface to standard microprocessors or microcontrollers such as Motorola or Intel CPUs and many others. Internally,the SL811HS contains a 256-byte RAM data buffer which is used for control registers and data buffer.The available package types offered are a 28-pin PLCC (SL811HS) and a 48-pin TQFP package (SL811HST-AC). Both packages operate at 3.3 VDC. The I/O interface logic is 5V-tolerant.

標(biāo)簽： 811 SL 開(kāi)發(fā)資料源程序

上傳時(shí)間： 2013-12-22

上傳用戶：a82531317
program to trasmit data to a TI92 with the TI Graph-Link

program to trasmit data to a TI92 with the TI Graph-Link

標(biāo)簽： Graph-Link program trasmit data

上傳時(shí)間： 2015-01-03

上傳用戶：youke111
Transfer Files to and from an FTP Server

Transfer Files to and from an FTP Server

標(biāo)簽： Transfer Server Files from

上傳時(shí)間： 2013-12-17

上傳用戶：jing911003
This book introduces embedded systems to C and C++ programmers. Topics include testing memory device

This book introduces embedded systems to C and C++ programmers. Topics include testing memory devices, writing and erasing Flash memory, verifying nonvolatile memory contents, controlling on-chip peripherals, device driver design and implementation, optimizing embedded code for size and speed, and making the most of C++ without a performance penalty. Pages : 336 Slots : 1

標(biāo)簽： programmers introduces embedded include

上傳時(shí)間： 2013-12-10

上傳用戶：shizhanincc