[introduction]Aerial is the eye of communication system and ear. It is energy of electromagnetism of a kind of help the device that travels between electronic equipment and air. Accordingly, aerial resembles the bridge that is circuit of electron of a join and electric wave. Equipment passes this kind of join, send and receive what realized signal. In daily life, aerial is general consist in is numerous in equipment, for example mobile phone and Wi-Fi. The use of different antenna is endless also and same.

Aerial is the eye of communication system and ear. It is energy of electromagnetism of a kind of help the device that travels between electronic equipment and air. Accordingly, aerial resembles the bridge that is circuit of electron of a join and electric wave. Equipment passes this kind of join, send and receive what realized signal. In daily life, aerial is general consist in is numerous in equipment, for example mobile phone and Wi-Fi. The use of different antenna is endless also and same.

Occasionally extremely aerial

Occasionally extremely aerial is used at transmitting broadcast and TV signal normally. It is antenna of a kind of radio frequency. This kind of antenna has two strong record or element of linear electric conduction. The length of these electric component is this job frequency about the half that the biggest wavelengh in free space is worth. Insulating material parts these two kinds of conductor from aerial center. Place laying a plan is shown for occasionally extremely aerial. This kind of antenna is OK the level is placed, OK also and perpendicular place.

Graph 1: Occasionally extremely aerial

Source of radio frequency voltage is located in aerial among. Two electric component provide voltage and electricity. These component can generate electromagnetism signal or radio signal, meet radiation arrives aerial is exterior. The tension of aerial center is the least, electric current is the biggest. And occasionally extremely aerial the electric current of two end is the smallest, voltage is the biggest. This is occasionally extremely the means of aerial allocation electric current.

The graph shows those who be line of bobbin of perpendicular Yu Tian 2 times occasionally extremely aerial direction graph. The radiation character of aerial passes means of form of to in an attempt to of radiation direction graph to depict come out. This mode described aerial how to launch energy to the space.

Graph 2: Radiation direction pursues

Accordingly, this antenna can believe report a changeover to be signal of radio frequency electromagnetism. These signal blast off in emissive end, it is changeover of signal of radio frequency electromagnetism telegraphic date in sink.

Annular antenna

The antenna of this kind of type is coil or degree of finish even wire bends annular make. In short, carry radio frequency streamline circle bend to be mixed into circle, quadrate, rectangle namely wait for appearance elliptically.

Structure of these days route simple, price is low and use is extensive. Their application is very much, use at AM broadcast and low frequency application normally.

Graph 3: Annular antenna

In the antenna of all appearance, the application of annular antenna is most wide. Because annular antenna is in,this is construction and analytic respect are very simple.

Annular antenna also calls radiation coil, the sectional coil that it is sheet or multi-line are encircled. The annular antenna that has circle or two more coil calls frame. The working frequency range that annular antenna permits arrives in 300 MHZ between 3 GHz.

Horn antenna

Horn antenna is antenna of a kind of aperture. It is microwave frequency only (30 GHz) of – of 300 MHz and design. The extreme of aerial submits horn form. This kind of appearance is had stronger directional, the signal that transmits accordingly can come true easy to doly remote transmit.

Graph 4: Horn antenna

Antenna of paraboloid dish form

Paraboloid antenna is collected or projectile energy, for example electromagnetic wave. This kind of antenna often appears in radar project.

Graph 5: Paraboloid antenna

Circular paraboloid reflector is made by the metal. This kind of structure is the frame that inside is enclothing gauze normally. The width of gauze chamfer must be less than λ / 10. Covering of this kind of metal namely reflector, the mirror of energy of appropriative reflex radar.

Dish form antenna can produce circular paraboloid pen form is shot bundle. If reflector is elliptic, can produce sector to shoot bundle. Surveillance radar used two kinds of different curvature on horizontal and perpendicular plane, come true thereby azimuthal on wants pen look is shot bundle, and the sector of classical cosecant square on angle of elevation is shot bundle.

Antenna of paraboloid dish form is had very strong directional, use at radio astronomy and satellite communications normally.

Antenna of cropland of 8 wood eaves

Antenna of cropland of 8 wood eaves (renown 8 wood antenna) be a kind directional very strong antenna, have two or component of many parallel and syntonic antenna serves as half wave idol extremely child. This antenna divides composition by 3 ministries: Component of reflector, drive and guider. Single drive component passes transmission line or emitter of join of other parasitism component or receiver. Below most circumstance, reflector and a few guider (longer component) it is parasitism component.

Graph 6: Antenna of cropland of 8 wood eaves

These parasitism component (shorter component) appropriative and passive resonator. They and drive element work together, disconnect with emitter or receiver electric join. 8 wood antenna is in normally high frequency with the job inside ultrahigh frequency limits, although be below the smallest bandwidth, also can offer interpose to arrive at 30 MHz the working frequency between 3 GHz. The unique design of these days line can realize good gain to be worth (exceed 10dB) .

Antenna of cropland of 8 wood eaves is had very strong directional. They are used at receiving TV normally signal and undertake radio corresponds.

Stick an antenna

Sticking an antenna is to pass in medium apparently etch give a conductor to stick an antenna that makes. Medium material installation is on ground connection layer, ground connection layer is propping up whole structure. Join arrives stick piece line of make a present of will arouse aerial. Stick an antenna to also call microstrip aerial or presswork aerial, the printed circuit that because this is,becomes through microstrip technology board.

Graph 7: Stick an antenna

Stick an antenna to be used at Wi-Fi and wireless communication normally.

Screw antenna

Screw antenna is the simplest antenna, use extensively at ultrahigh frequency application, working frequency is normally inside VHF and ultrahigh frequency limits. This kind of antenna has the lead of appearance of a helix.

Graph 8: Screw antenna

Screw antenna has the unique character such as tall bandwidth, tall gain and round polarization. The frequency limits of this kind of antenna is between 30MHz -3GHz, commonly used at dimensional communication, satellite communications and wireless network.

Whip form antenna

Whip form antenna is common at sheet extremely radio antenna. This is meant should change an antenna, is not two antenna move side by side or form annulus way. These days line is used extensively in the equipment such as mobile phone and hand-held radio.

The length of whip form antenna decided its potential wavelengh. Laden coil can install any positions inside aerial length limits, in order to shorten the length of whip form antenna. Accordingly, inductance increases below the condition that can not adding whip to grow. The commonnest whip form antenna is antenna of form of half wavelengh whip and antenna of form of 1/4 wavelengh whip.

Whip form antenna is perpendicular polarization, because it is perpendicular installation,carry in bottom on. Whip form antenna is called normally antenna of form of complete Xiang Bian, because they can be on horizontal to each directional radiate signal. But strictly speaking is not such, because antenna of all whip form has blind area of taper of a coping.

Chan Pin and double frequency antenna

Aerial can divide antenna of the frequency that it is sheet and double frequency antenna, specific depend on aerial is OK in Chan Pin paragraph in the job or in much frequency paragraph in the job.

Odd frequency antenna can work below specific frequency. Limits of this one work normally narrower. Require a frequency only paragraph application can use this kind of antenna. Traditional TV system and broadcast frequency use odd frequency antenna. The antenna of this kind of type can undertake modification in the light of specific frequency, in order to score highest efficiency and gain. Whip form antenna, sheet pole antenna, annular antenna, horn antenna and screw antenna are odd frequency antenna.

And the job below the frequency that double frequency antenna can differ in two. These days line is every frequency paragraph provided alone component or feed point. Normally, need many frequency paragraph application can use Shuang Pin antenna. What mobile system uses is double frequency antenna. The antenna of this kind of type can be in all sorts of frequency paragraph on move, and need not disjunctive antenna. Occasionally extremely aerial, stick an antenna, 8 wood antenna and logarithm cycle aerial is Shuang Pin antenna.

The main distinction of Chan Pin and double frequency antenna

The distinction of odd frequency antenna and double frequency antenna depends on his designing, working severally at its frequency paragraph amount.

It is a few main distinction that these two kinds of antenna are designing below:

Design of odd frequency antenna produces vibration to be below specific frequency. The physical dimension of aerial decided this kind of vibration. The length of aerial decided its job frequency. The bandwidth of these days line is very narrow, can leave the job with around frequency in resonance only.

Double frequency antenna designs the resonance frequency that differs to have two. The frequency that these frequency use at two to differ normally paragraph. Double frequency antenna is every frequency paragraph provided alone component or feed point, move below the frequency that makes aerial can differ in two. If use different physical measurement to design every frequency paragraph aerial component, can optimize function in the light of every frequency limits.

The function characteristic of Chan Pin and double frequency antenna

In performance side, chan Pin and double frequency antenna have actor drawback each. These advantages depend on application. If place issueing a list shows,function contrasts:

The application of Chan Pin and double frequency antenna

Choosing is use Chan Pin when aerial or double frequency antenna, frequency requirement is crucial. Be every kinds of antenna below is common with exemple:

Odd frequency antenna

• Mobile phone signal box

• GPS system

• Satellite communications

• Radar system

• Broadcast and TV signal are sent

Double frequency antenna

• Wi-Fi road by implement

• RFID system

• Blue tooth equipment

• Wireless receive a point

• Mobile phone

Affect the factor of function of antenna of odd double frequency

The position that puts Chan Pin and double frequency antenna is very significant. Good place assured more excellent performance. These elements include:

1. position: Inside limits of line of sight, aerial and target must be on a line, and without keep out. Not due the building of interference or harsh ambient conditions.

2. direction: The direction of aerial is crucial. Directional antenna is more sensitive to directional mistake. To obtain stronger signal, aerial must point to a target. But, the antenna such as omnidirectional antenna does not have specific directional requirement.

3. interference: The function of Chan Pin and double frequency antenna may drop because of the interference of different origin. What choose the position to should avoid to disturb as far as possible. Can use filter or screen implement will reduce interference.

4. cable loss: The cable that receives aerial communication system repeatedly can cause signal loss. The cable of high quality conduces to utmost ground increasing signal strength.

Aerial cost (Chan Pin and Shuang Pin)

The cost of Chan Pin and double frequency antenna because of a variety of elements different, for example:

Production material

• Aerial can be made by different material. These material may produce major effect to cost. For example, the high grade stuff such as use copper or aluminium may be more more expensive than steeliness antenna.

• Supply circumstance and producing area to also can affect its price with what expect at making aerial material.

Dimension

• The dimension of aerial also can affect cost. Because material is mixed,make those who make cost increase, big antenna is more expensive than small antenna.

• But, aerial dimension still depends on working frequency. Taller frequency needs smaller antenna normally.

Performance level

• The antenna with optimizes to improve performance may more inferior than function antenna is more costly. For example, the aerial price with the more inferior than function antenna with the antenna with wider bandwidth or taller efficiency is higher.

Odd frequency antenna

• Odd frequency antenna compares petty gain of double frequency antenna normally. Because these days line was aimed at onefold frequency Duan Jin to go to optimize,this is.

• The cost of odd frequency antenna depends on the frequency that its optimize paragraph, the dimension of aerial and function.

Double frequency antenna

• The price of double frequency antenna prep above is normally odd frequency antenna, the frequency that because double frequency antenna can be in two,differs paragraph on move.

• Optimized frequency paragraph, the cost that all sorts of elements such as dimension and function decided Shuang Pin antenna.

Alliance of E sth resembling a net and numerous supplier spread out collaboration, offer include antenna of odd frequency chip and antenna of double frequency chip inside combination of fixed resistor product, can use at all sorts of application in industrial environment.

About alliance of E sth resembling a net

Be subordinate to of alliance of E sth resembling a net belongs to Farnell group. Farnell is global electron yuan the parts of an apparatus and industrial system design, branch that safeguard and maintains product and technology sells business, dedicated and fast with reliable delivery. Arrive from archetypal research and design production, farnell is round-the-clock provide reliable product and professional service for the client. 80 years by right of even more 47 industry experience, this locality turn the professional group of website and many 3500 employee, farnell devotes oneself to to offer compose to propose the of all kinds package that prospective technology place needs for the client.

Farnell manages Farnell brand in Europe, north America manages Newark brand, asia-Pacific area manages brand of alliance of E sth resembling a net. In the meantime, farnell still passes CPC company to offer money to British area directly.

Since 2016, farnell joined global technology to part company of the An Fuli that sell business (Na Sida overcomes code: AVT) . Nowadays, bilateral collaboration is endowed with can Farnell support client is whole product lifecycle, offer distinctive cent to sell service, end to arrive upright consign and knowledge of products plan major.

(author: Group of technology of alliance of E sth resembling a net)

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