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12 Aug 08 Antenna gain higher dBi

Some friends inquire frequently, how wireless router’s signal that does miss, cannot pass through the wall. What wireless Router signal buys to be best?

Whether actually the wireless product can realize the long-distance range signal to transmit stably, besides with agreement, wireless module and design related, antenna’s function similarly cannot neglect. Trades a high gain the antenna to trade a performance better router to be simpler than convenient, the cost is not too high, therefore is the promotion way which most is worth recommending. Certainly, this wants your router to support the dismantable antenna.but the antenna also has and the equipment (Router /AP/ network card) the compatibility.

Because the router and the network card amount of power and so on this aspect’s factor signal the building construction network environment has the relations.

Antenna’s two key parameters:

The antenna has two parameters to be essential: Gain and directivity. The gain expressed that the antenna power enlargement factor, the value bigger expression signal’s enlargement factor is bigger, i.e. works as the gain value to be bigger, the signal is stronger, the transmission quality is better. What the directivity refers to is the antenna radiation and receives whether to have the direction, namely antenna whether to come to some angle the signal is specially keen and the radiating capacity whether to concentrate in some angle.

The antenna has the different radiation or receptivity to the spatial different direction, this is antenna’s directivity. According to the directive difference, the antenna has omnidirectional and the directional two kinds, but each kind of antenna’s application domain is different, because of each has its strong points.

Omni directional antenna: The weight antenna directivity usual use directional diagram, in the horizontal plane, the radiation and the receive does not have the most general orientation the antenna to be called the omni directional antenna. Because omni directional antenna tropism with an improper method, therefore multipurpose in spot to multi-spot correspondence zone center. If builds the wireless network between the identical building or great distance very near building, is quite suitable to select increases the omni directional antenna high.
 
Directional antenna: Some or the many radiations and the receptivity most general orientation’s antenna is called the directional antenna. The directional antenna energy is centralized, the gain relatively omni directional antenna must be high, suits in the long-distance range point-to-point communication, because simultaneously has the directivity, antijamming ability is quite strong. If for example, an enterprise needs to surmount several buildings or the block builds the wireless network, then suits provides the high gain directional antenna.
 
Gain: The gain is one of antenna’s major technique targets, it is the directive coefficient and the efficiency product, is the antenna radiation or the receive electric wave size performance. Puts briefly, under the same level condition, antenna’s gain value is higher, the directivity is also bigger, the covering scope is also broader.
 
attention:
 
For the wireless signal’s expansion, some users like replacing the high gain the antenna. Because the antenna is the passive component, will not increase the power, no matter will add the big gain the antenna, it will launch the power will not be higher than 50mw, the emissive power will mainly be decided by the launch hot spot, namely wireless router, wireless AP itself, if the launch hot spot itself power will be small, then has traded the high gain antenna, the effect will not be obvious.

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12 Aug 08 如何改善Wi-Fi接收信号

在2005年6月最远的的WiFi连接纪录创下了125英里。 这个距离大概是在您的需要之外时，最大化您的信号强度和减到最小无线干扰的一些快的技巧。

  1. Put 大的家具沿着外面墙壁 of 你家.
  2. 使镜子减到最小。 所有金属表面会反射WiFi信号，包括在多数镜子找到的稀薄的金属层数。
  3. 在以下地点之一中安置您的路由器:
    • 在房子附近比较高的中心。
    • Off the floor, 理想地说在一个高架子上。
    • 尽可能的从您的邻居的Wi-Fi路由器(哪些，当然，您保证了使用一种不同的频道)。
    • 远离无线电话和微波, which operate on the same 2.4-频道。
    • 保留天线一样很远从电源线和其他计算机导线尽可能。 那些灯芯绒裤和导线可能干涉无线电信号接收。

技巧:

  • 计算机箱他本身可以是一个重大障碍到Wi-Fi信号- 尝试定位机箱所以他不能在网卡和路由器天线之间.
  • 增加一个”高增益天线” (更高的dBi) 外部天线的加法经常将提供增加接收无信信号和性能。 注意一更高的dBi水平地增加信号，但是垂直减少。 如果您需要盖几个地板，一更高的dBi大概不会帮助。 在这种情况下，您也许考虑买Wi-Fi放大器，将促进您的信号。 
  • 反射器可能也使用到好好处。 使用NetStumbler调整您的反射器的安置。 可以使用雷射唱片，象能实际上看起来象一台抛物面反射器的任何。 应该在接受设备或天线之后安置反射器，当然。 在信号强度的大增量可以期望。 这个把戏也与手机一起使用。 
  • 如果所有发生故障，您能调查购买WiFi中继器，是硬件片断您能使用促进在路由器和您的设备之间的信号。
  • 根据无线路由器您的品牌和型号, 在软件可以能用增加更多能力和选择增加力量到您的无线天线的替换开源固件刷DD-WRT。
  • 如果您仍然需要更远的范围，考虑升级您的无线标准，由与MIMO的草稿N (未发布规则N)或无线G决定。 这两技术以前很大地将增加一个802.11g或802.11b网络的范围。

    • 注意:

    • 如果您刷路由器的固件DD-WRT，它也许使您的保修无效。
    • 如果您转动力量太…而兴奋的一个修改过的无线路由器它也许遭受永久损坏。

    英文原文参考:Boost Your Wi-Fi

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    19 May 08 IEEE 802.11n 无线路由器时代已经到来

    IEEE 802.11n可以将WLAN的传输速率提升至：300Mbps甚至高达600Mbps.

    在覆盖面方面IEEE 802.11n采用智能天线技术，通过多组独立天线组成的天线阵列，可以动态调整波束，保证让WLAN用户接收到稳定的信号，并可以减少其它信号的干扰。因此其覆盖范围可以扩大到好几平方公里。如果在你的IEEE 802.11n设备[如:路由器]上加装一个高强度的增益天线，那么几十公里完全不是问题。

    目前提供IEEE 802.11n产品的有:Linksys(Linksys 双频段(2.4GHz与5Ghz)+USB Linksys 802.11n WRT600N)， D-Link，Netgear， Buffalo以及Belkin等。

    兼容性方面:兼容IEEE 802.3的IEEE 802.3u ，IEEE 802.3ab ，的IEEE 802.11b的IEEE 802.11 a的，IEEE 802.3x ， IEEE 802.11g的， IEEE 802.11n

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