From national defence, solar system studies ship and plane, radar overspreads a structure to producing crucial effect in respect of protective radar equipment. These the root of fangfeng prevent pluvial crust to wait for radio frequency system to radar, microwave and other antenna is “ transparent ” , use at signal is transmitted and capturing, and won't disturb the signal that carries them.

Although " radar overspreads " ,one word is the combination of " radar " and " dome " , but these protective structures are not vaulted appearance normally, have a variety of figure however, include to be used at protecting antenna of large dish form to go up sensitive antenna component and those who use Yu Haijun application is compact model the flat form of radar system.

General and plastic company (General Plastics) polyurethane foam of production uses as normally composite material, have interpose report property, can use at making radar cover and relevant case.

They are the optimal dielectric in communication, telemetering and radar system, can sensitize electron component won't be bumped by rainwater, wind, hail, snow, sanded, insect, flyer, ultraviolet ray is destroyed and the environment such as fast temperature change browbeats.

The applied range that radar overspreads is very wide

Safe / military affairs / national defence: Radar is overspread but screen and hold back electronic surveillance tool, use at intercept satellite communications and the tool of utility of all sorts of radar air defence for example. They provide battle of reconnoiter, electron, defence and blow of anticipate the enemy and data link and electronic opposed support for military airplane platform.

Secure aerial: Radar cover can prevent a fragment to drop in metallic surface, prevent to metallic surface freezes and be affected by sleet.

Business uses an aircraft: Commercial flight number relies on signal to undertake navigation or correspond. The radar that uses in aircraft nose structure overspreads the play in can ensuring aerial is explored in atmosphere optimal function.

Maritime satellite communications: Radar overspreads aboard to be used at protecting dish form antenna, these days line is used at dogging continuously to secure satellite and navigation.

The broadband corresponds: On tanker and large You Lun, the radar cover that the diameter is more than 3 meters may enclothe the antenna that TV of join speech, data and Internet transmit.

Private houseboat: To speech and low speed data, small-sized and private houseboat can use a diameter small the radar cover to 26 centimeters.

Solar system research: Bureau of American space navigation (NASA) in out-of-the-way, unmanned live, the place with signal little pollution used tremendous radar antennae.

Why is polyurethane foam the optimal option that compose proposes effective protective screen?

The radar cover that use relevant data to make and has proper configuration in the light of application and radio frequency limits cannot pass electronic means to detect almost, won't produce any adverse effects to generation or captured signal thereby.

Utility of polyurethane expanded plastics extensive, intensity tall, cost effectiveness good, medium disturbs tall, function low, and dimension stability is admirable. Although the polarity of water is very strong, may bring about them to lose character or produce change as the elapse of time. But because these foam are material of closed pore scanty water (not bibulous) , because this won't be changed along with time.

In addition, in extreme chill and windy environment, the bubble structure all round radar antennae can puff with preventing wind snow aerial. In addition, as natural dielectric, foam can restrain cold hot transmission, reduce potential dangerous temperature wave motion.

For example, below bright sunshine, the antenna that did not protect may be in arrive from night during diurnal change warm up quickly, endanger function and service life thereby.

Radar cover uses cascade normally or beforehand dip craft is made, in this kind of craft, it is very easy that colophony enhances lamination material agglutinate arrives low density or in on foam of density horniness polyurethane. Polyurethane foam is compared because of its outstanding intensity weight and famed with the ability that its support composite material construction.

The note of select material

General and plastic company (General Plastics) all polyurethane foam has distinctive function and advantage, this conduces to decide its apply. Certain polyurethane foam has low dielectric constant and the characteristic with small tangential loss, suit radar to overspread application.

The choice of material still depends on the appearance of covers sensitive electron cell or outline, and the necessity that protects them. LAST-A-FOAM®Series of material of FR-3700 high-powered core and foam of polyurethane of series of material of FR-7100 multipurpose core special agree with these application.

Compare with FR-7100 photograph, LAST-A-FOAM®FR-3700 more hard usage. FR-3700 density Gao Ke with bearing harsh environment is affected, apply at needing the military affairs that the oldest rate protects and national defence domain for example.

This kind flame retardant the superexcellent substitute that series of high-powered core material is lumber, can be able to bear or endure suffer most chemical and dissolvent, and have very tall intensity weight compare.

Although LAST-A-FOAM®FR-7100 is so solid without FR-3700, but for inferior to the risk application, its enough is competent, and cost is inferior.

The other good point of series of material of this kind of multipurpose core still includes stoma construction (can achieve flowing exterior result) , dimension stability and closed pore structure (won't bibulous or suck tide) . FR-7100 suits to have the application of more sort or lower performance demand most.

Bigger radar cover asks to exposing normally so not strict. For example, cover of a of Alaska large radar needs to bear only wind and likely hail can, and warship or weapon system need solidder, much better the composite material of function will protect radar system to avoid suffer lose. Still can get meanwhile the influence of bubble recipe and density, they decided the function of material.

Through the function of test and verify

To general and plastic company (General Plastics) distinctive LAST-A-FOAM®The test that material has makes clear, these bubble can develop good function below all sorts of microwave frequency, and without many hot loss.

The fact proves, these products have moistureproof property, be trashy influence almost to radio signal, accordingly they are protective aviation, nautical the first selection with antenna of Liu Jiwei wave.