Microwave Engineer Interview Questions


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Microwave Engineer was asked...23 September 2018

What is your favourite subject and how good are you at

1 Answers

Answered my own way but couldn't impress

Knowles Corporation

About PAs, mixers, and transmitters

1 Answers



What are the reasons you would put a filter before or after the LNA?

1 Answers

List tradeoff between LNA compression and added Loss due to the filter


How did I achieve desired gain flatness across the operating bandwidth in specific design.

1 Answers

I carefully specified all filters to have better than specified flatness, minimized inter stage mismatch with the use of fixed attenuators, and followed all mixers with reflectionless filters Less


1) Describe the behavior of a parallel RLC circuit 2) What happens to the signal inside a waveguide when the frequency is below and above the waveguide's cutoff frequency 3) Describe why and how to bias an amplifier 4) What are conduction angles for amplifiers? 5) Explain the components of a RF receiver and how they play a role in recovering the message?

1 Answers

1) observing the extremes in frequency, we see that at DC, the inductor behaves as a short and the capacitor behaves as an open, but due to the parallel configuration, the output voltage is zero. Same thing happens for very high frequencies but the roles of the cap and inductor flip. At resonance, however, the equivalent impedance of the inductor and capacitor are zero, thereby increasing the gain at that frequency. overall this results in somewhat of a bell-shaped curve in the frequency response. 2) below the cutoff frequency, signals are evanescent and get attenuated highly. Above the cut-off frequency, the TE10 mode is activated, but at much higher frequencies, more and more waveguide modes are excited which result in interference between various modes and result in lower throughput. 3) Amplifier must be biased in order to set their small signal characteristics, such as transconductance, gain, and output impedance. Ideally, we would want the DC biasing to be as stable as possible, this can be achieved by creating feedback through a "degeneration resistor" to connect the source of a NMOS to ground, or the emitter of a NPN to ground. This decreases the overall gain but decreases its sensitivity to temperature variations. 4) I do not know. We did not discuss any of this in the circuit courses at my university. But I know this has to do with amplifier classes. All I know about that is that class A is least power efficient but more linear, and as you go higher in class, the lower the linearity but the higher the efficiency. 6) a typical RF receiver is composed of a low noise amplifier, an image reject filter, bandpass filter, mixer, and an ADC. The low noise amplifier amplifies the weak signal while maintaining a reasonable noise figure for the chain, the image reject filter is tuned in accordance with the mixer's oscillator frequency to reject image signals, the bandpass filter attenuates the mixing products that are undesired, and the ADC converts the signal to the digital domain for processing. Less

Bharti Airtel

how do you plan 2000 km DWDM network

1 Answers

Starting from fiber quality, components required to build the system, nms,


What is the IIP3 of an amplifier?

1 Answers

the input power of the 3rd order intercept point. rf engineers use this parameter as one of the ways to characterize dut's linearity performance. Less


None. Not even a single question was asked


Tested programming skills


Domande tecniche su componenti e antenne

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