21.11.2000. TELEFILTER Application Note General. f

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21.11.2000. TELEFILTER Application Note General. f

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PCB: tft029
21.11.2000.
TELEFILTER
Application Note
General.
filter driven balanced way. matched matching element values given below theoretical calculations based measured values termination impedance, given specification -parameters filters PCB. there parasitics customer PCB, matching elements have optimised regarding circuit design. have tested (tft029) different versions matching network: balanced scheme with shunt resistances.
Unbalanced matching.
have tested unbalanced matching networks with reactance elements with shunt resistance scheme calculation made with consideration parasitics. capacities C1par C2par used simulation parasitics effect (tft029) only. Theoretical matching. Scheme
values matching elements, which given below diagram, calculated 22.-23 with consideration -values 70.100 SMD-elements parasitics capacities C1par; C2par based measured S-parameters filter 140.
1par
2par
Scheme
below table shows termination impedances input output insertion loss depend different Q-values matching elements with constant reactance part matching elements from above diagram
Input termination impedance ideal 1312,24 -6,195 1261,62 -6,188 1245,64 -6,186 1214,89 -6,181 1177,61 -6,174 1131,46 -6,166 1037,22 -6,143 940,40 -6,112 R+jX 180,0 179,9 179,9 179,8 179,7 179,6 179,3 179,0 Output termination impedance 1480,98 -5,347 1423,90 -5,341 1405,87 -5,339 1371,20 -5,335 1329,15 -5,330 1277,10 -5,322 1170,78 -5,303 1061,52 -5,276 R+jX 29,9 208,3 31,1 208,2 31,5 208,1 32,3 208,1 33,4 207,9 34,8 207,8 38,0 207,4 42,0 206,9 -21,0 -21,3 -21,7 -22,0 -22,2 -22,5 -23,0 -23,2
25,2 26,2 26,5 27,2 28,1 29,3 32,0 35,4
next tables show matching elements depend different Q-value different parasitics capacities C1par C2par PCB. Simulated termination impedances constant input 1177,61 -6,174 output: 1329,15 -5,330
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
PCB: tft029
21.11.2000.
TELEFILTER
Application Note
Table C1par C2par Input matching values Output matching values Q-value ideal
301,2 308,3 310,8 316,0 323,0 333,2 361,3 409,3
Q-value ideal
325,7 333,6 336,4 342,1 350,0 361,4 393,0 447,7
Table const. Input matching values Output matching values C1par
Cpar2
Matching PCB. Scheme
matching networks test board (PCB tft029) tested with SMD-components with Q-value Matching elements values given below
Scheme PCB: tft029
Filter next typical values with unbalanced scheme (typ.) 22,2.22,6 Group delay ripple (p-p). Triple transit signal 47.49 VSWR(S VSWR(S Filter response shown Appendix
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
PCB: tft029
21.11.2000.
TELEFILTER
Application Note
Theoretical matching. Scheme
values matching elements, which given below diagram, calculated 22.-23 with consideration -values 70.100 SMD-elements parasitics capacities C1par; C2par= based measured S-parameters filter 140.
35,8
1par
33,4
2par
Scheme
below table shows termination impedances input output insertion loss depend different Q-values matching elements with constant reactance part matching elements from above diagram
Input termination impedance ideal 1342,9 -6,2127 1279,7 -6,1999 1260,0 -6,1956 1222,5 -6,1867 1177,7 -6,175 1123,1 -6,1589 1014,7 -6,1194 907,6 -6,0659 R+jX 179,6 179,7 179,7 179,7 179,7 179,7 179,7 179,7 Output termination impedance 1512,9 -5,3611 1443,5 -5,3504 1421,9 -5,3468 1380,5 -5,3394 1331,0 -5,3297 1270,6 -5,3163 1150,2 -5,2832 1030,6 -5,2385 R+jX 29,1 208,0 30,6 208,0 31,1 208,0 32,1 208,0 33,3 208,0 35,0 207,9 38,9 207,9 43,8 207,8 -21,0 -21,3 -21,7 -22,0 -22,2 -22,5 -23,0 -23,2
24,5 25,7 26,2 27,0 28,1 29,5 32,9 37,1
next tables show matching elements depend different Q-value different parasitics capacities C1par C2par PCB. Simulated termination impedances constant input 1177,61 -6,174 output: 1329,15 -5,330 Table 6,20 C1par C2par Input matching values Output matching values Q-value ideal
31,6 32,9 33,4 34,4 35,8 37,8 43,3 53,1
205,0 204,5 204,3 203,9 203,4 202,7 200,8 197,9
Q-value ideal
29,2 30,6 31,0 32,0 33,4 35,3 40,7 50,4
229,4 229,0 228,8 228,5 228,0 227,3 225,4 222,4
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com
Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
PCB: tft029
21.11.2000.
TELEFILTER
Application Note
Table const. Input matching values Output matching values C1par
31,9 32,7 33,5 34,2 35,0 35,8 36,6 37,3 38,1 38,9
217,5 214,6 211,7 208,9 206,1 203,4 200,8 198,2 195,7 193,3
Cpar2
29,0 29,9 30,8 31,6 32,5 33,4 34,2 35,0 35,9 36,7
246,0 242,2 238,5 234,9 231,4 228,0 224,7 221,5 218,3 215,3
Matching PCB. Scheme
matching networks test board (PCB tft029) tested with SMD-components with Q-value Matching elements values given below
Scheme PCB: tft029
Filter next typical values with unbalanced scheme (typ.) 22,3.22,6 Group delay ripple (p-p). Triple transit signal VSWR(S VSWR(S Filter response shown Appendix
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com
Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
PCB: tft029
21.11.2000.
TELEFILTER
Application Note
Commentary.
matching networks does slightly differs from theoretical matching. reasons that parasitics parallel capacities serial inductors microstrip board tft029 particularly differences Q-value matching components. parasitics customer board (mentioned parasitics, additional parasitics active parts) different this (tft029), matching elements will have slightly adjusted. Both line shunt elements will change both pass band shape (tilt, concave, convex) insertion loss ILo.
Details.
Insertion loss depends much Q-value matching elements parasitics capacities board (PCB). Pass band shape characteristic tilt pass band depends much series elements schemes Both each side input output have adjusted your board design. Insertion loss, group delay ripple return loss depend shunt resistances parallel matching elements: scheme scheme
Comparison matching schemes:
Electrical characteristics filter equals matching networks. Scheme with parallel capacities have better selection compared with schemes with parallel inductors Schemes more stable filter characteristic band, than scheme because relative accuracy (tolerance) matching series elements scheme larger element L1,2 element L3,4 than scheme element L1,2 element C1,2 With shunt resistances improve VSWR( S11, attenuation stopband will better metal shielding (electrically connected ground separates space between input output matching elements, crosstalk will reduced.
Additional note.
send filter sample (tft029) according your requirements.
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com
Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
PCB: tft029
21.11.2000.
TELEFILTER
Application Note
Appendix Measured data with unbalanced scheme
Scheme PCB: tft029
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com
Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
PCB: tft029
21.11.2000.
TELEFILTER
Application Note
Appendix Measured data with unbalanced scheme
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com
Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
PCB: tft029
21.11.2000.
TELEFILTER
Application Note
Appendix Measured data with unbalanced scheme
Scheme PCB: tft029
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com
Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
PCB: tft029
21.11.2000.
TELEFILTER
Application Note
Appendix Measured data with unbalanced scheme
TELEFILTER Potsdamer TELTOW Germany Tel: (+49) 3328 4784-0 Fax: (+49) 3328 4784-30 E-mail: tft@telefilter.com
Vectron International, Inc. Lowell Road Hudson, 03051 Phone: (603) 598-0070 Fax: (603) 598-0075 e-mail: vti@vtinh.com
TELEFILTER reserves right make changes product(s) and/or information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.

21.11.2000. TELEFILTER Application Note General. f

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