55mm Filters
55mm Filters
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Analysing of Single stub filter
Microstrip is used extensively in both hybrid and monolithic microwave integrated circuits (MICs and MMICs) and it is by far the most popular medium for design of components with active devices. Although microstrip is physically extremely simple, it is the most complex of all transmission lines. There are no known closed form analytic expressions for the characteristics impedance and propagation velocity. Nevertheless , its popularity is a result of the ease with which one can attach chip components (resistor , capacitors , transistors etc.) , the relatively good thermal dissipations properties of the medium and, above all , the ability to make adjustments to microstrip circuits while operating at RF.
Notch filter provides a deep notch (about 47dB) at 1269MHz using a quarter wave open stub connected to the through 50 ohm line. It is intended to be placed between the antenna and the 2401MHz preamp or converter. At 2401MHz the stub is nearly half-wave long and hardly affects signals at 2401MHz, but the small shunt inductance of the stub is cancelled out at 2401MHz using a small open circuit stub. The through loss including 2 sma connectors is only 0.14dB, so the filter should not add significantly to the system noise figure. It is hoped that this 47dB added to the 15dB coupling loss in the antenna should be sufficient not to overload the S-Band LNA or converter with the 1269 transmit signal, to allow proper duplex operation.
q In my observation, the width of the line which provides minimum out of band while maintaining the original filter specification ( > 25 dB at 3.0 GHz) is .6 mm.
q When both the width of the stub line and TEE section is increased (e.g .65mm , .7mm in my observation) then the inserion loss became became worse than it had with the original width.
q When both the width of the stub line and TEE section is decreased (e.g .55mm , .5mm in my observation ) then the original curve shifted to the right and insertion loss becomes less.
q It is also observed that when the length of the stub is 18.4 mm the centre frequency of the filter is 3.1 GHz and the insertion loss is reduced to 36 dB.
q Therefore we can say that if the length of the stub decreased then insertion loss also decreases subsequently.
About the Author
1:Microwaves and optical communications laboratory book
2: http://www.iee.org/OnComms/pn/rf/
3:http://www.g3wdg.free-online.co.uk/notch.htm
4: http://www.nd.edu/~hscdlab/labs/lab6.pdf
Hama uv filter 55mm unboxing
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Filed under Air Filters by on Feb 6th, 2010. 
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