2.4ghz Frequency Band Point To Point Wireless Transmission Technology - Band, Point To Point,

Alternative Cable SolutionWireless communication between the device consumer product development for many long-standing dream

. However, a long time, the radio frequency spectrum has been the object of control by governments, their use has limitations, the purpose is to prevent different Source The RF signal interference. In most countries, most of the radio spectrum is Broadcasting , Television, the military, emergency services and the recent rapid spread of Mobile A telephone retained.

It was in recognition of the short-range, low bandwidth data communications in many industrial, scientific and medical (ISM) applications, the value, has been regarded a few governments do not need to apply for leave RF spectrum use permit applications. In the spectrum of products to their end-users do not have the government or a regulatory agency to apply for special permission to be able to use various equipment. With the end of 20th century consumer electronics products, the rapid development of consumer applications are starting to use these resources in the spectrum.

Or in the distribution of these frequencies Launch Power limits, the duty cycle and can transmit the data type and so on, governments almost no coordination between tradition. This has resulted in worldwide regulations related to the confusion, allowing the different jurisdictions in different ways or for different purposes to use the spectrum in different frequency bands. This article first 433MHzISM band, Bluetooth2.4GHz 2.4GHz agreements and new agreements to be a non-network analysis, and then WirelessUSBLS example to illustrate the non cluster 2.4GHz agreement to replace consumer electronics devices with the benefits of connecting cables.

433MHz Solutions Some band designated for ISM by most government and consumer applications, including, 27MHz and 433MHz frequency bands near the most commonly used. Although these bands can be used in some applications, but there are quite a few shortcomings. In different countries, 433MHz and 435MHz RF between the different parts of the spectrum is assigned to the spectrum without the need for licensing application. Some countries limit the maximum transmission power 1mW, others will be the limit of 10mW. Some occasions Transmitter The maximum duty cycle limitations, and other occasions no. In many cases, certain types of data transmission is not allowed. For example, certain areas of Europe to restrict or ban the use of these frequencies to transmit audio data.

Although the relevant regulations in the world Memory Some differences, but consumer electronics manufacturers, or find the use of the spectrum to offer its customers a new feature. 433MHz band is the most common application of garage door opener and keyless vehicle type into the system, but it is also a large number of other applications has been widely used.

433MHz band has many features to get the favor of low-throughput applications, particularly in a geographic area for market development of products.

Cost - although the general transmitter and receiver must use special components to design, but the overall cost is still modest. Many manufacturers can provide suitable receiver IF subsystem IC, and the transmitter can often use discrete transistors and passive components to Make .

reasonable distance - can be carried long distances of 10 meters or more reliable data transmission, and, if the bandwidth / throughput decreased, the transmission distance can be extended.

However, when the complexity of electronic products with the rise of user expectations increased, 433MHz band some of the deficiencies highlighted will gradually come out:

a channel available bandwidth is limited. In most occasions, cost-effective solution that will limit the bandwidth of 10kbps (or less).

severely restricted the available spectrum is narrow the number of available channels, even in each channel are used far less than the maximum allowed value of the spectrum width of no help. This limits the same general area can also work within the number of devices. From the manufacturer's point of view, the defect is also more than these:

lack of global standards means that the same product often have different variants for different markets around the world for specialized manufacturing. The variant product may be used slightly different frequency, or with a different RF output power.

Because almost no work for the band's equipment to the "system-level" standard, the developer has often had to design their own radio. In general, they must first select the modulation scheme and protocol, etc. - followed by General Standard components to design the radio transmitter and receiver, but can not purchase an integrated radio IC and using a standard protocol. This makes new product development process is time-consuming, expensive and full of risk.

usually the major world markets require a different management from the body for testing or certification of products. This will also spend a lot of time, and costly.

Bluetooth ( Bluetooth ) Technology Bluetooth is a professional group from the Bluetooth (SIG) developed for wireless personal area network (W PA N) of the new standards. Bluetooth is a protocol used 2.4GHzISM band frequency hopping. Bluetooth can connect up to 8 percent piconet (Piconet) and the number of connected devices distributed network piconet support. Many PDA and cell phone manufacturers for the following reasons in the device using Bluetooth technology:

system standards - Bluetooth defines the professional group to use the model for each of the standard Bluetooth functionality, making from different manufacturers can have a Bluetooth device interoperability.

bandwidth - the maximum data rate of Bluetooth technology to 723kbps - far higher than 433MHzISM band can provide data rates.

expensive - because the agreement required the use microprocessors and licensing expenses, Bluetooth solutions, pricing is usually 5 dollars.

Confidentiality - Bluetooth with built-in authorization and authentication algorithm and a basic encryption algorithm. While Bluetooth technology has to be with those from other vendors equipment interoperable devices becoming more common, but for many consumer electronic devices

by:gaga

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