What is RF resistor？
What is RF resistor? Simply put, resistors used in RF microwave communication systems are called RF resistors.
Everyone should be familiar with radio frequency current, which is a shorthand for high-frequency alternating current electromagnetic waves.
A high-frequency current that changes more than 10000 times per second is called radio frequency current.
RF resistor is a passive device that can block the passage of radio frequency current. And convert electrical energy into heat or other forms of energy, with the unit of ohms (Ω) being the same as ordinary resistance.
RF resistors are generally classified based on power, and there are various ways to classify them:
Classified by external structure, it can be divided into:
1.Chip Resistor (chip resistors are divided into single electrode chip resistor and dual electrode chip resistors)
2.Leaded Resistor (leaded resistors are divided into single leaded resistors and dual leaded resistors)
3.Flanged Resistor (flanged resistors are divided into single lead flanged resistors and dual flanged resistors)
According to the production process classification, it can be divided into:
1.Thick film RF resistor (referred to as thick film resistor)
2.Thin film RF resistor (referred to as thin film resistor)
According to power classification, it can be divided into:
1.High power RF resistor (referred to as high-power resistor, generally referring to resistors with a power of 60W or more)
2.Low power RF resistor (abbreviated as low-power resistor, generally referring to power resistors below 20W)
Classified by frequency, it can be divided into:
1.High frequency RF resistor (referred to as high-frequency resistor, generally a resistor with a frequency higher than 3GHz)
2.Low frequency RF resistor (abbreviated as low-frequency resistor, generally a resistor with a frequency lower than 3GHz)
Materials and advantages and disadvantages for making RF resistors:
1.Beryllium oxide (BeO) has high thermal conductivity, almost equal to pure copper and aluminum, with a thermal conductivity coefficient of 200-250W (m.K), making it the preferred material for making RF resistors. Its biggest disadvantage is that it is highly toxic in powder form, making it difficult for contact wounds to heal. So generally, manufacturers of RF resistors buy molded sheet materials and do not require secondary processing. This results in the use of beryllium oxide (BeO) to make RF resistors that can only be printed on a single chip, greatly reducing production efficiency.
2.Aluminum nitride (AlN) is also a material with high thermal conductivity, with a thermal conductivity of about 20W/m.K. It has good mechanical properties and higher flexural strength than aluminum oxide and beryllium oxide ceramics. Due to its non-toxic nature, it can be printed using continuous printing technology, which can greatly improve production efficiency. Currently, it is the preferred material for high-power RF resistors.
3.Aluminum oxide (Al2O3) is the preferred material for low-power surface mount resistors, as its thermal conductivity is about 1/5 of aluminum nitride. It is rarely used in the selection of materials for high-power RF resistors.
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