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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Analog & RF Filter Basics - Answers
RF Cafe Quiz #70

RF Engineering Quizzes - RF CafeAll RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

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Note: Some material based on books have quoted passages.

This Analog & RF Filter Basics Quiz targets those of you who are relative newcomers to the world of radio frequency (RF) electronics, but seasoned vets are welcome to give it a go as well. It addresses frequency response and physical construction. Images were obtained from Anatech Electronics documents entitled "Guideline for Choosing RF and Microwave Products" and "Understanding Filter Types and Their Characteristics." API Technologies' "RF & Microwave Filters," is also referenced. Please report any suspected errors to me via e-mail. Return to Quiz #70.

 

Anatech Analog Filter Quiz (Q1) - RF Cafe1.  The plot to the right is representative of amplitude and group delay responses for which type of analog filter?

 

c) Chebyshev

Cheyshev filters exhibit amplitude ripple in the passband and monotonic roll−off in the stopband.

 

 

Anatech Analog Filter Quiz (Q2) - RF CafeCavity tuned filter construction (Anatech Electronics) - RF Cafe2. The photo to the right represents which type of filter construction?

a) Cavity
b) Ceramic
c) Crystal
d) Lumped element L/C (inductor/capacitor)
e) Tubular

 

a) Cavity

Cavity filters use a coil inside a cavity for interstage coupling and resonance. They typically have a very high "Q" and low insertion loss.

 

 

Anatech Analog Filter Quiz (Q3) - RF Cafe3.  The plot to the right is representative of amplitude and group delay responses for which type of analog filter?

a) Bessel
b) Butterworth
c) Chebyshev
d) Elliptical
e) Ideal

 

e) Ideal

An ideal filter exhibits perfectly flat amplitude and group delay (and phase) in the passband and infinite attenuation in the stopband. As the name implies, ideal filters cannot be realized in the real world.

 

Anatech Analog Filter Quiz (Q4) - RF Cafe4. The photo to the right represents which type of filter construction?

a) Cavity
b) Ceramic
c) Crystal
d) Lumped element L/C (inductor/capacitor)
e) Tubular

 

b) Ceramic

Ceramic filters exploit the electromechanical resonance of the substrate to pass or reject signals depending on the frequency.

 

Anatech Analog Filter Quiz (Q5) - RF Cafe5.  The plot to the right is representative of amplitude and group delay responses for which type of analog filter?

a) Bessel
b) Butterworth
c) Chebyshev
d) Elliptical
e) Ideal

 

a) Bessel

Bessel filters are referred to as maximally flat group delay filters with no deviation at the band edge, as the plot demonstrates.

 

Anatech Analog Filter Quiz (Q6) - RF Cafe6. The photo to the right represents which type of filter construction?

a) Cavity
b) Ceramic
c) Crystal
d) Lumped element L/C (inductor/capacitor)
e) Tubular

 

 d) Lumped element L/C (inductor/capacitor)

A lumped element filter uses actual physical inductors and capacitors as resonant elements to determine whether specific frequencies are passed or blocked.

 

 

Anatech Analog Filter Quiz (Q7) - RF Cafe7.  The plot to the right is representative of amplitude and group delay responses for which type of analog filter?

a) Bessel
b) Butterworth
c) Chebyshev
d) Elliptical
e) Ideal

 

b) Butterworth

Butterworth filters are referred to as maximally flat amplitude filters because the passband does not have any insertion loss ripple.

 

 

Anatech Analog Filter Quiz (Q8) - RF CafeAPI Technologies Tubular Filter - RF Cafe8. The photo to the right represents which type of filter construction?

a) Cavity
b) Ceramic
c) Crystal
d) Lumped element L/C (inductor/capacitor)
e) Tubular

 

e) Tubular

Tubular (aka Coaxial) filters have inherently broad stopbands with very high rejection levels. They are often inserted inline with coaxial cable interconnects when unplanned interference needs to be handled.

 

 

Anatech Analog Filter Quiz (Q9) - RF Cafe9.  The plot to the right is representative of amplitude and group delay responses for which type of analog filter?

a) Bessel
b) Butterworth
c) Chebyshev
d) Elliptical
e) Ideal

 

d) Elliptical

Elliptical (aka Cauer) filters have the highest theoretical stopband attenuation roll−off for a given number of poles.

 

 

Anatech Analog Filter Quiz (Q10) - RF Cafe10. The photo to the right represents which type of filter construction?

a) Cavity
b) Ceramic
c) Crystal
d) Lumped element L/C (inductor/capacitor)
e) Tubular

 

c) Crystal

Crystal filters rely on the electromechanical resonance properties of (most often) quartz crystals that are shaped and sized for resonance at specific frequencies.

 

 

Posted August 19, 2020

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