logoperiodik antennalar

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slide 1 11- maruza mavzu: yassi logoperiodik antennalar. * reja: 1.logoperiodik antennalar (lpa). 2.ruporli (karnaysimon) antennalar. 3. ytk ni ruporning uzunligi va yoyilish sirti o‘lchamlariga bog‘liqlik grafigi. 4. tezlatuvchi va sekinlashtiruvchi linzalar. * logoperiodik antennalar (lpa). logoperiodik antennalar (lpa) juda keng polosali antennalar klassiga kiradi va ular chastota o‘zgarishi bilan yo‘nalganlik diagrammasi shaklini ham, kirish qarshiligi qiymatini ham o‘zgarmas saqlaydi. antennaning ishlashi elektrodinamik xoslik prinsipiga asoslangan bo‘lib, unga ko‘ra antenna o‘lchamlari ma’lum son marta o‘zgartirilganda va to‘lqin uzunligini ham shuncha son marta o‘zgartirilsa, antennaning xarakteristikalari o‘zgarmay qoladi. logoperiodik antennalarning bir qancha turi mavjud. ko‘rsatilgan tebratgichli logoperiodik antenna variantini ko‘rib chiqamiz. * the atmosphere is a cloud of gas and suspended solids extending from the earth's surface out many thousands of miles, becoming increasingly thinner with distance but always held by the earth's gravitational pull. the atmosphere is made up of layers surrounding the earth that holds the air we breath, …

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ko‘rinishiga ega ikki o‘tkazgichli liniyalar birining ichida joylashtirilgan koaksial liniya orqali amalga oshiriladi. koaksial liniyadan ikki o‘tkazgichli liniyaga o‘tishning bunday usuli simmetriklovchi element talab qilmaydi. * the envelope of gas surrounding the earth changes from the ground up. five distinct layers have been identified using thermal characteristics (temperature changes), chemical composition, movement, and density. each of the layers are bounded by "pauses" where the maximum changes in thermal characteristics, chemical composition, movement, and density occur. troposphere the troposphere begins at the earth's surface and extends up to 4-12 miles (6-20 km) high. this is where we live. as the gases in this layer decrease with height, the air become thinner. therefore, the temperature in the troposphere also decreases with height. as you climb higher, the temperature drops from about 62°f (17°c) to -60°f (-51°c). almost all weather occurs in this region. the height of the troposphere varies from the equator …

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se and mesopause, are called the middle atmosphere by scientists. the transition boundary which separates the stratosphere from the mesosphere is called the stratopause. mesosphere the mesosphere extends from the stratopause to about 53 miles (85 km) above the earth. the gases, including the oxygen molecules, continue to become thinner and thinner with height. as such, the effect of the warming by ultraviolet radiation also becomes less and less leading to a decrease in temperature with height. on average, temperature decreases from about 5°f (-15°c) to as low as -184°f (-120°c) at the mesopause. however, the gases in the mesosphere are thick enough to slow down meteorites hurtling into the atmosphere, where they burn up, leaving fiery trails in the night sky. thermosphere the thermosphere extends from the mesopause to 430 miles (690 km) above the earth. this layer is known as the upper atmosphere. the gases of the thermosphere …

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rtiradi. logorifmik masshtabda rezonans chastotalar lpτ ga teng intervalda takrorlanadi, ayni shu holat lnfn =(n-1)lnτ + lnf1 bu klassdagi antennalar nomiga asos soldi. * in order to measure the conditions of the lower atmosphere, the national weather service utilizes an upper air network across the country. pictured here is an upper air site in shreveport where weather balloons are release twice a day, in the morning and in the evening. the instruments pictured above measure temperature, relative humidity, pressure, and wind speed/direction at various levels from the ground up to over 50 thousand feet. the data collected at each upper air site is used with other data sources in numerical weather models to help predict future weather patterns. ruporli (karnaysimon) antennalar. sodda tuzilishga ega bo‘lgan antennalardan biri oxiri ochiq to‘lqin o‘tkazgich hisoblanadi. ammo to‘lqin o‘tkazgich nurlatuvchi maydonining nisbiy o‘lchamlarini kichikligi (a/λ, b/λ), sirt toklarini to‘lqin o‘tkazgichning tashqi devorlariga oqib kirishi, …

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perpendikulyar joylashishi kerak. * the atoms and molecules that make up the various layers in the atmosphere, despite their tiny size, actually exert some weight on us. we feel this weight as pressure. air pressure is simply the weight of air above an object. the weight of air is directly related to the number of air molecules in a given volume. so, air pressure depends on the number of air molecules in a given volume above an object and how fast the molecules are moving. from sea-level to the top of the atmosphere, the weight of all molecules above each square inch of any object (for example, a one inch by one inch piece of paper), is about 14.7 pounds. that is a lot of weight considering it is just molecules. however, it is also a lot of molecules. near sea-level, a box with a volume of one cubic inch …

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slide 1 11- maruza mavzu: yassi logoperiodik antennalar. * reja: 1.logoperiodik antennalar (lpa). 2.ruporli (karnaysimon) antennalar. 3. ytk ni ruporning uzunligi va yoyilish sirti o‘lchamlariga bog‘liqlik grafigi. 4. tezlatuvchi va sekinlashtiruvchi linzalar. * logoperiodik antennalar (lpa). logoperiodik antennalar (lpa) juda keng polosali antennalar klassiga kiradi va ular chastota o‘zgarishi bilan yo‘nalganlik diagrammasi shaklini ham, kirish qarshiligi qiymatini ham o‘zgarmas saqlaydi. antennaning ishlashi elektrodinamik xoslik prinsipiga asoslangan bo‘lib, unga ko‘ra antenna o‘lchamlari ma’lum son marta o‘zgartirilganda va to‘lqin uzunligini ham shuncha son marta o‘zgartirilsa, antennaning xarakteristikalari o‘zgarmay qoladi. logoperiodik antennalarning bir qancha turi mavjud. ko‘rsat...

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