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*Guiding electromagnetic systems 2010/2011
*

1

Assignment n. 4 – Filters

** Assigned: Monday, May 9
th
**

**, 2011
**

** Due: Thursday, May 19
th
**

**, 2011 (before start of teaching)
**

**Problem n. 1
**

Design a high-pass filter adopting impedance and admittance inverters with the following

specifications:

Cutoff frequency equal to 4 GHz;

15 dB insertion loss at 2 GHz;

Maximally flat response;

Reference impedance equal to 50 Ω.

Draw the transmission line circuit and specify all the characteristics of the transmission lines.

**Problem n. 2
**

Design a band-pass filter using three short circuited resonant λ/4 stub with the following

specifications:

Band-pass between 3.0 and 3.5 GHz;

0.5 dB equal ripple response;

Reference impedance equal to 50 Ω.

Is it possible to realize the filter using microstrip technology, rexolite (εr = 2.54, h = (1/8)’’)

dielectric material, and strip widths between 0.5 and 15 mm?

**Problem n. 3
**

Design the same filter as in problem n. 2 but using coupled lines. Is it possible to realize the filter

using microstrip technology, rexolite (εr = 2.54, h = (1/8)’’) dielectric material, and strip widths

between 0.5 and 15 mm (adopt PUFF to find the microstrip dimensions)?