2.45 GHz wifi Antenna

2.45 Ghz 20Bdi wifi Booster antenna | 2.45 Ghz 17 Bdi wifi booster antenna | 2.45 Ghz 25 Bdi yagi wifi antenna

Why do we need to use 2.45 Ghz wifi antenna?

A 2.45 GHz wifi antenna, specifically IEEE 802.11n WiFi, is to the internet of things, RFID, and wireless sensor nets what The Who at 115 decibels is to a Verdi opera. Pete Townshend just pounding out power chords backed by huge stacks of Crown amps, in a way that nothing else can be heard. Such is the dilemma faced by the team pushing zombie and any of the other dozens of “standards” that claim to be IEEE 802.15.4. The guys who invented zombie picked 2.45 GHz when it was fashionable to do so, but in conversation after conversation, the industry agrees including many 802.15.4 “insiders” that 2.45 GHz was an expedient decision whose date with oblivion is approaching. The flight to alternative (and more geo-limited) frequencies like 900 Mhz by 15.4 devotees is further validation of the perils of deploying at 2.45 Ghz.

Antenna properties

An antenna has three fundamental properties: gain, direction, and polarization.
Gain is term used for measuring of increase in signal power, described in decibels (dB). Antenna with a higher gain is more effective in it's radiation pattern.
Every antenna is designed to raise the power in the wanted direction and reduce it in unwanted directions. Gain of an antenna is reciprocal, meaning it is the same communication.
Polarization is the orientation of wireless signal relative to the earth. It can be vertical, horizontal, circular or combinations of these. In WiFi networks most signals are vertically polarized.
Objects that reflects signal (metallic, water and glass objects) can affect polarization. Two antennas with similar polarization will inter-operate most effectively.

Rules and regulations

The Federal Communications Commission (FCC) has been generous with its governance over the world of Wi-Fi communications. Because Wi-Fi operates in the unlicensed area of the broadcast spectrum, anyone can set up a wireless network. However, you should know some important regulations that concern your wireless network.
The Right Antenna for the Right Device On July 12, 2004, the FCC issued rule 04-165, which has important implications for devices that operate in the 2.4-GHz and 5-GHz bands. As you recall, those are the bands in which 802.11a, 802.11b, and 802.11g reside. The important part of this rule talks about "Replacement Antennas for Unlicensed Devices." Until this point, the FCC required any antenna used with a wireless device to be tested and certified as part of a system. That is, you could not mix and match equipment and antennas.
Although you can go to a vendor and purchase antennas to connect with your wireless devices, there's a lawyer ball going on here. It's akin to buying a switchblade kit. The kit can be sold (and it's perfectly legal); however, assembling the kit is illegal. The new FCC rule does not wave a magic hand across all antennas, providing broad and unrestricted legality. There are still some provisos.
When you use a replacement antenna (and the antenna is different than what was originally provided by the manufacturer) then such an antenna can be used, provided it is of the same family of antennas. That is, if it is a patch, Yagi, and so on. Also, an antenna's gain must be equal to or less than the gain for which the manufacturer has attained approval. For example, if Cisco has certified a 25-dBi Yagi, a 25-dBi Yagi or lower gain antenna from another antenna vendor can be used.

Power Regulation

The FCC has not given carte blanche to wireless networks simply because they operate in the unlicensed bands of the spectrum. It still regulates how much power an antenna can output. In the 5.725-GHz to 5.825-GHz band (also known as the Unlicensed National Information Infrastructure 3 [UNII3] band), antennas are limited to a power of 1 watt or 30dBm. Antenna gain for unidirectional antennas is limited to 6dBi. Antennas with a gain higher than 23dBi must have power reduced 1 dB for every 1dB above 23dBi. The Cisco 1400 Bridge operates in the UNII3 band.


Antennas transmitting in the 2.4-GHz band are also limited to 1 watt with a maximum antenna gain of 6dBi. That said, there are also maximum values that depend on the type of system employed namely, point-to-point versus point-to-multipoint deployments:
• In point-to-point systems that use a directional antenna, for every decibel the transmitter is below 30dBm, the antenna can increase by 3dBi. For example, a 29dB transmitter can have a 9-dBi antenna; a 28-dB transmitter can have a 12-dBi antenna.
• In point-to-multipoint systems, the FCC has limited the maximum effective isotropic radiated power (EIRP) to 36dBm. For every dB that the transmitter is reduced, the antenna increases by 1dB.

Amplification

Simply put, unless an amplifier came as part of your wireless system, the FCC does not want you to use one. You are allowed to use only an amplifier that comes certified with your wireless system. Unless an amplifier was submitted for testing along with the radio and antenna, it cannot be sold in the United States and it cannot be sold separately.

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What is the best WiFi antenna for me?

Directional Antennas

Directional antennas are used for Point-to-Point or sometimes for Multi-Point systems depending on the setup. If you are trying to go from one location (say for instance your router), to another location, this is the type of antenna we recommend.

Omni-Directional

This is the common “Base” antenna used for Point-to-Multi-Point or can be an omni-directional antenna for your car. An Omni-Directional antenna would serve as your main antenna to distribute the signal to other computers or devices (such as wireless printers, PDAs, etc) in your workgroup. You can use 2 Omni-Directional antennas for a point to point system, but this is usually not recommended because there is no real point to distributing your signal all over the place when you only want to going from point A to point B. Please refer to Directional antennas above.

Point-to-Point

Point-to-Point systems usually involve 2 different wireless points, or building to building wireless connections. But there are exceptions to every rule. If the access point is across a long valley and the owner of the system wishes to share the connection with multiple users on the other side of the valley. This would be a point to Multi-Point system but using directional antennas.



Point to Multi-Point

Point to Multi-Point systems is usually for sharing a WLAN (Wireless Local Area Network) or a high-speed internet connection inside of your home or with neighbors (oops, we didn't say that). They can also be for WAP (Wireless Access Points) such as you find at local coffee shops, truck stops, airports, RV parks and the ever expanding list of WAPs becoming available. Traveling with a notebook computer is extremely fun and can be a great business tool for the frequent traveler.



Range

The range of the signal will depend on several factors, including power output of your wireless card or router, receive strength of the wireless card or cards you are transmitting to, obstructions buildings or trees which may be in the way of your transmitting path, walls, etc. Since there are so many factors which can determine the overall range of your wireless system, it is impossible to cover it in this simple article. A rule of thumb however is to always choose an antenna which you think may be overkill. Why? Because the power output is extremely small it is necessary to have as much gain as possible. Most wireless cards have a power output of 32 milliwatts (+15dBm), which is roughly the same amount of power it takes to light a high power LED (Light Emitting Diode). LEDs are bright, but imaging trying to see one at a large distance or through a building or trees. This is why the antenna is critical for amplifying that signal so it is as strong as possible. Why is the power output so small? Because 802.11 works at the same frequency as a microwave oven (2.4 GHz) and if it put out a large amount of power…. well, enough said. Microwave popcorn!



One of our most frequently asked questions is how to choose the correct WiFi antenna for a particular situation. This can be either very simple or very complex depending on your particular application or what you need to do. 802.11b (11 Mbps) and 802.11g (56 Mbps) (Mbps stands for megabits per second and is a measure of bandwidth) standards provide excellent speed, but this completely depends on your signal strength and noise level of your wireless card and wireless system. This basically equates to, the larger the signal strength and the less noise your wireless card receives, the better.

Home

Home antennas are always the easiest types of antennas to purchase and take the least amount of effort in choosing and installing. In most circumstances, only one antenna is needed on the remote computer. We recommend putting any external antenna on the remote computer, simply because if you install it on your router and don’t plan on setting up security, it will provide less signal strength outside of your home and your system will be less prone to hackers. If you have a multi-story home or a very large house, you may have to install antennas on every computer to get the range or bandwidth required. Every wall that you have to penetrate will decrease the signal strength of your system. For the best signal strength and signal, we recommend installing a 5dB ceiling dome antenna and either wireless desktop antennas or RL-1000 antennas on all remote computers.

Office

Office antennas are pretty straight forward. If you want to run a network system inside of your office building and don’t want to run cables all over the place, first, purchase a good wireless card, install a Ceiling Dome, Desktop or Wibberduck antenna to extend and maximize the signal to your office router. It’s that simple. However, this can get a little complex if the office is split between 2 different points or if the office is really large or on multiple stories of a building.

Mobile WiFi antennas

Why would anyone want WiFi in their car? Well, there are a lot of truck-stops and RV parks around the country now that offer wireless access. In fact, many public high speed wireless networks can be accessed directly from your car, truck, or RV. There is also something called WarDriving which is where bad people drive around neighborhoods and get their high-speed access for free.

Yagi Antennas

Yagi antennas were the design of two Japanese people, Hidetsugu Yagi and Shintaro Uda, and are sometimes referred to as Yagi-Uda antennas. They were originally designed for radio, but are now also used for 802.11 systems. These antennas are typically very directional and are used for point to point, or to extend the range of a point to multi-point system.

Backfire antennas -

The backfire is a small directional antenna with excellent gain. They look similar to a parabolic dish, but the gain isn't as high. We highly recommend Backfire antennas for point to point or point to multipoint systems because of the excellent gain and the good noise figures.

Parabolic or dish antennas

This is where the real power is! Parabolic dish antennas put out tremendous gain but are a little hard to point and make a connection with. As the gain of an antenna increases, the antenna’s radiation pattern decreases until you have a very little window to point or aim your dish correctly. Dish antennas are almost always used for a point to point system for long haul systems. The Parabolic Dish antennas work by focusing the power to a central point and beaming the radio’s signal to a specific area, kind of like the adjustable reflector on a flashlight. These antennas are highly focused and are the perfect tool if you want to send your signal a very long distance.

Gain Considerations

The gain you will require for each individual WiFi antenna system will dependant on any direct objects in your path, the distance you must cover and the individual wifi cards. These all must be taken into consideration before choosing the proper antenna system.

Interference

As with all radio systems, interference is always a problem. If you are listening to an AM radio and you hear static, this is interference. The same thing applies to WiFi systems, however not to such a large degree. Things that cause interference with WiFi systems are Microwave ovens, certain lighting systems, other 802.11 access points or systems, microwave transmitters, even high speed processors for computers can cause interference for 802.11 systems. All these problems must be isolated before you can expect any significant range out of your system.

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BASIC CONSEPT OF ANTENNA

Wi-Fi Antenna Basic Concept and Common Implementation

Wi-Fi Antenna that part of a transmitting or receiving system which is designed to radiate or to receive electromagnetic waves wirelessly. An antenna can also be viewed as a transitional structure (transducer) between free-space and a transmission line (such as a coaxial line). An important property of an antenna is the ability to focus and shape the radiated power in space e.g.: it enhances the power in some wanted directions and suppresses the power in other directions.

Below is an example of a roof-mounted wi-fi antenna:



Wireless or Wifi antennas are separated into two main types, directional and omnidirectional. For long distance work there is no substitute for a good directional antenna. While focusing the transmitted signal to cover greater distance, the receive performance is also greatly enhanced. By listening in one direction only, a significant amount of ‘noise’ from other directions is eliminated, providing a better ‘signal to noise ratio‘.

Directional antennas are used for Point-to-Point or sometimes for Multi-Point systems depending on the setup. If you are trying to go from one location (say for instance your router), to another location, this is the type of antenna we recommend. Directional antennas are Backfires, Yagi, Panel and dish type antennas.
An Omni-Directional antenna would serve as your main antenna to distribute the signal to other computers or devices (such as wireless printers, PDAs, etc) in your workgroup. You can use 2 Omni-Directional antennas for a point to point system, but this is usually not recommended because there is no real point to distributing your signal all over the place when you only want to going from point A to point B. Typical Omni-Directional Wi-Fi antennas consist of Vertical Omnis, Ceiling Domes, Rubber ducks, Small Desktops and Mobile vertical antennas.

Moreover, nowadays most people try to construct homemade antennas to boost their Wi-Fi range. Below is a video of an example of it:


The performance of an antenna is measured in dB. For every 3db of gain the power is doubled. Most manufactures specify gain as dBi (dB gain over an isotropic or fictitious antenna radiating equally in all directions).

When using an antenna to increase the range of your wireless network, be careful not to violate any local laws governing output power. Because the signal is magnified in one direction the EIRP (Equivalent Isotropically radiated Power) is increased.

Basically, 2400 to 2463 MHz (channels 1-9) maximum EIRP of 4W (36dBm) and 2463 to 2483 MHz (channels 9-13) maximum EIRP of 200mW (23dBm).





As you can see, this grid or parabolic directional antenna (above) is designed to reflect the signal into a focal point. This is similar to how a magnifying glass works with light. This type of antenna usually provides the best gain and thus the longest link distance. It can focus the signal into a very fine point.



Directional antenna, yagi with bigger elements also serves to reflect signal back to the main element, thus focusing the signal from one direction.

Even though omnidirectional antennas do radiate in all directions, they too can be made to perform better by improving their gain. In this case the sphere pattern that would surround an antenna with no gain, is squashed flatter to provide better coverage out to the sides instead of wasting energy transmitting up and down.

In addition, here is a video of an advanced omnidirectional antenna with amazing features but has not been that much known.

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Latest Advancement In Antenna

What is an LTE antenna? An LTE antenna or LTE TDD antenna that an antenna use for LTE (LTE TDD) systems. First of all, what is LTE? Long Term Evolution (LTE), is the latest standard in the mobile network technology tree that produced the GSM/EDGE and UMTS/HSPA network technologies. LTE is more and more popular in the wireless communication market. It is a project of the 3rd Generation Partnership Project (3GPP), operating under a name trademarked by one of the associations within the partnership, the European Telecommunications Standards Institute. With the development of LTE system, LTE antenna is more and more popular in the wireless communication antenna market also.



LTE antennas can be classificated as omni directional antenna and directional antennas. An omnidirectional antenna can transmit signal in 360degree, and can receive signals from all directions also. Many wireless routers and Wi-Fi access points use an omnidirectional Wi-Fi antenna to reach all of the rooms in a home or office. It is called point to multi-point. Of course omnidirectional wifi antennas use in point to point systems also. LTE antennas including 400-2700MHz roof mount antennas, 700-2700MHz broadband ceiling lamps decorative antennas, 800-2700MHz small wall mount flat panel antennas, 2.3-2.7GHz directional panel antennas, 2.3-2.7GHz omni fiberglass antennas, 2.3-2.7GHz parabolic antennas, 800-2700MHz directional roof mount antennas.

Yingjie Wifi Antenna is Advancing its Performance

Having established its partnership with Huawei, ZTE and other giants in this area, Yingjie, the wireless wifi antenna manufacturer, is leading its way in sound track with good performance since its foundation. There is no doubt that Yingjie will continue its excellent performance in designing, manufacturing and selling communication antenna; as a major part in the manufacturing process, wifi antenna helps the company gain its momentum. As mentioned above, Huawei is a long term partner with Yingjie, which provides wireless wifi antenna over years for this world famous. Looking forward, Yingjie is developing rapidly in advancing its wifi antenna.

It is such a delight to know that Yingjie is paying unprecedented attention to its R&D department. The R&D team in this company is consisted of one chief engineer, who has more than 12 years of experience in design and manufacturing communication antenna like wifi antenna, along with 3 more engineers and technicians. In the coming years, Yingjie will surely recruit more professionals in engaging in the research and development of the wifi antenna, with correspondent more energy being invested in this area

Moreover, wireless wifi antenna is widely used in telecommunication area, which is becoming an indispensable technology in this information-prevailing age. To catch up with this trend, more and more manufacturers are trying to have a taste of this huge market share. Among all, I have to say, Yingjie is doing the best. This Foshan-based company has more than 25-year history in development antenna, witnessing many ups and downs in this field. Truth be told, it is like an old and experienced manufacturer in meeting all kinds of setbacks and share all sorts of delight in the achievements it has achieved.

Antenna Booster

An antenna booster device is used to amplify reception so that when a signal is marginal, someone is more likely to be able to utilize it. There are a number of products on the market which claim to be able to improve signal quality by acting as an antenna booster. Some of these products do indeed work as advertised, while others do not, and buyers should be wary about what they buy and how they use it.

The simplest form of antenna booster is simply a length of wire which increases the length of the antenna. Other techniques use reflectors, which are designed to concentrate the signal and bounce it onto the antenna so that a clearer signal comes in. Extenders and reflectors can be purchased from locations like electronics stores, and people can also make their own. Some companies also make pre-amplifiers, which attach to the antenna to amplify the signal before it enters the device.

The basic idea behind antenna boosters that work is that they expand the area of the antenna, allowing it to pick up more of a weak signal, which translates into a stronger signal for the device the antenna is attached to. Antenna boosters can be used to improve radio signals, making them popular among shortwave radio enthusiasts trying to pick up overseas broadcasts, and they were also used historically for analog television broadcasts.

One of the most popular applications for the antenna booster is cell phones. In areas with poor coverage, such as rural areas and buildings with thick walls which block signals, antenna boosters are used to help people avoid dropping calls. Cell phone antenna boosters are not terribly effective, because it is difficult to extend a cell phone's antenna without making the phone hard to use. What tends to be more effective is a cell phone repeater, an external advice which acts like a miniature cell tower. Repeaters are expensive, and are most commonly seen in locations like buildings and trains which want to maintain a clear signal for the benefit of occupants.

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