RF & Microwave Community

What is the difference between LTE Cat M1 and NB-IoT?

Jul 26, 2017

Both NB-IoT and LTE CAT M1 are Low Power Wide Area (LPWA) Technologies developed for IoT (Internet of Things) Applications. The Internet of Things will connect millions of devices to the internet. Unlike traditional cellular applications, IoT devices need to transmit small amounts of data in infrequent bursts. Another requirement for these devices is that they must be low cost and last for over 5-...read more

What are the Advantages of GaN Base Stations?

GaN

Raghav Kapur - everything RF

Jul 10, 2017

In this video, senior customer account leader from Qorvo, describes how wireless infrastructure base stations benefit from high-voltage, high-power gallium nitride (GaN) products. Qorvo’s provides gallium nitride on silicon carbide (GaN-on-SiC) products which have long lifetimes and high reliability at 50-volt operation. Qorvo’s GaN products come in a wide variety of power output levels to address...read more

3.5 mm, 2.92 mm and SMA Connector Compatibility

Connectors

Raghav Kapur - everything RF

Jul 9, 2017

Yes. SMA, 3.5mm, and 2.92mm (K) connectors all have similar mechanical characteristics which allows them to be mated to each other. However, because the dimensions of each connector are slightly different the connection is not ideal and does result in degraded electrical performance.The outer diameter of a SMA Connector is about 4.13 mm (0.163 in) and the outer diameter of the of the other two con...read more

What are the Advantages of the 4.3/10 Connector Interface?

Connectors

Peter McNeil - L-com Global Connectivity

Jul 12, 2017

DIN 7/16, N-type, 4.3/10, and 4.1/9.5 are all coaxial cable standard types used in wireless infrastructure and mobile wireless equipment. Each are different in size, power handling, frequency, and other electrical and mechanical specifications. Specifically, 4.3/10 and 4.1/9.5 are more compact versions of DIN 7/16, optimally designed for use in dense interconnect scenarios, such as distributed-ant...read more

What is the 3D Smith Chart?

Smith Chart

ANDREI MULLER - 3D Smith Chart Tools S.R.L.

May 23, 2017

Theoretical answer:On a 2D Smith chart one is bounded by the unit circle, all the circles which never get together on a 2D Smith chart "long" to meet again but never do since the points are thrown at infinity in all directions. The circuits which are mapped out of the unit circle Smith chart represent circuits with negative resistance which occur in active circuits design( amplifiers, transistors,...read more

What is QZSS (Quasi-Zenith Satellite System)?

GNSS

Raghav Kapur - everything RF

Apr 10, 2017

The Quasi-Zenith Satellite System (QZSS) is a regional navigation satellite system commissioned by the Japanese Government. It was authorized by the Japanese government in 2002. The first satellite, was launched in 2010 and three additional satellites are expected by be in orbit by the end of 2017. The four-satellite system is planned to be operational in 2018.The QZSS service will work East Asia ...read more

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What is the difference between a monopole and dipole antenna?

Antennas RF Basics

Peter McNeil - L-com Global Connectivity

Jul 12, 2017

In essence, the difference between a monopole and dipole antenna, is that a dipole antenna uses an additionally radiator to generate a synthetic ground plane between the symmetric radiator elements, where a monopole antenna requires a physical ground plane. For a dipole antenna, the radiator elements are connected 180 degrees out-of-phase to each other, such as with the inner and outer conductor o...read more

What is a RF Limiter?

Active Components Limiters

Raghav Kapur - everything RF

Nov 4, 2016

RF Limiters are used in Transmit/Receive modules to prevent damage to the low noise amplifier due to excessive power at the input of the system. LNA's and other components in the receive chain of a wireless systems are very sensitive, as they are usually designed to accept small signal levels which are then amplified.In ideal situation where the input power to a system is within the limits of the ...read more

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