What is the characteristic impedance of a coaxial line high frequency?

Most coaxial cables have a characteristic impedance of either 50, 52, 75, or 93 Ω. The RF industry uses standard type-names for coaxial cables.

Why coaxial cable is not used in high frequency applications?

A key to coaxial cable design is a tight control of cable dimensions and materials. Together, they ensure the characteristic impedance of the cable takes on a fixed value. High-frequency signals are partially reflected at impedance mismatches, causing errors. Characteristic impedance is sensitive to signal frequency.

What is the maximum frequency supported by coaxial cable?

The drawing below shows all the transmission lines used in RF, from KHz to GHz, the coaxial cable line is the most used and most cost-effective, it can be used by up to 110 GHz with the current technology.

How does the attenuation of coaxial cable change as the frequency of the signal it is carrying increases?

All cables have some amount of loss, generally measured in loss in dB per unit length (e.g. feet or meters). The higher the frequency, the higher the attenuation and loss. The higher the frequency, the more often electrons are bumping into molecules and setting them in motion.

Does coax length affect impedance?

A length of coax cable exhibits a capacitance between the inner conductor and outer shield. The lower the impedance, the higher the coax capacitance for a given length because the conductor spacing is decreased.

What makes coaxial cables better for high frequency signaling?

Coaxial cables can be used to carry signals for internet connections, but internet signals run at higher frequencies than traditional analogue video. It has a larger conductor, which provides a much better signal quality, and the dielectric insulation is thicker.

What is the frequency range of the coaxial cable?

The coaxial cable portion of our networks uses frequencies from 5 MHz to 1218 MHz (1.2 GHz) or higher. “Radio frequency” can describe the type of signal that occupies the aforementioned portion of the electromagnetic spectrum.

How are frequencies across the HFC spectrum impacted by attenuation?

This effect occurs because the current uses less of the cross-sectional area of the conductor at higher frequencies, resulting in higher attenuation at higher frequencies. The extensive bandwidth of hfc networks produces a great disparity in attenuation between the low and high frequencies of the spectrum.

What is the impedance of a coaxial line?

IMPEDANCE The impedance of a coaxial line (over about 1 MHz) depends only on the type of dielectric used, or by the dielectric constant εr, and the ratio between the diameter of the inner conductor and the inner diameter of the outer screen (not the size) and it is independent of the length and frequency.

What is attenuation and how does it affect your cable?

Attenuation is also commonly more present in cables as they increase in length. So the further the cable is installed the more chance there is that attenuation can affect your cable.

What is an outdoor rated flexible low loss communications coaxial cable?

LMR®240 is also an outdoor rated flexible low loss communications coax with an impedance of 50 Ohm. It is designed for short feeder runs for a variety of applications including GPS, WLAN, and Mobile Antennas.

What is the difference between coaxial cable impedance rating and Pim?

Each type cable has an impedance rating. Factors affecting this is the size of the cable and what materials the cable is constructed from. Standard coax impedances are 50-75 ohms. This has been tested as a great balance between power handling a low loss. PIM stands for Passive Intermodulation.