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A compact dual-band bandstop filter having one spurline and two embedded open stubs
Accepted Manuscript Title: A Compact Dual-Band Bandstop Filter Having One Spurline and Two Embedded Open Stubs Author: Shujun Yang PII: DOI: Reference:
S2314-7172(16)30028-9 http://dx.doi.org/doi:10.1016/j.jesit.2015.12.004 JESIT 83
To appear in: Received date: Revised date: Accepted date:
8-9-2015 4-12-2015 27-12-2015
Please cite this article as: {http://dx.doi.org/ This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
A Compact Dual-Band Bandstop Filter Having One Spurline and Two Embedded Open Stubs Shujun Yang
Dept. of EE and CS, Alabama A&M University, Huntsville, AL 35810, USA, [email protected]
1
Abstract— A compact dual-band microstrip bandstop filter (BSF) is presented. It combines a conventional open-stub BSF, a spurline, and two embedded open stubs. This BSF is simulated and fabricated. It generates two stopbands around 2.0 GHz and 3.0 GHz without increasing circuit size, compared with the conventional BSF. Index Terms— Bandstop filter, embedded open stub, spurline.
I. INTRODUCTION BSFs are used to cut off unwanted signals at certain frequencies. Microstrip BSFs are being widely used in local oscillators, mixers, duplexers, switches, and other microwave subsystems. Various techniques have been developed to synthesize and design microstrip BSFs [1]. In general, there are at least three ways to design microstrip BSFs [2]. The first way is to place resonators in parallel with the main transmission line [1]. At resonant frequencies, the resonators take energy from the main transmission line through coupling. The second way to design microstrip BSFs is to tap resonators, such as open stubs, to the main transmission line [3]. The third way to design microstrip BSFs is to use defected ground structures (DGS) [4-7]. Dual-band BSFs are highly desired in many applications for their two separate stopbands. Conventionally, a dual-band microstrip BSF can be obtained by cascading two different BSFs. The side effects are the high insertion loss in the passband and increased circuit size. Varies methods have been proposed to form dual-band microwave BSFs. The dual stopbands can be obtained through frequency-variable transformation to the lowpass prototype [8] and cul-de-sac configuration [9], and the application of right/left-handed metamaterials [10], parallel open stubs at different lengths [11] and dual mode ring oscillators [12]. Size reduction of dual-band BSFs has been a hot research topic in recent years [4]. Stepped impedance resonators (SIR) [13], split ring resonators [14], and the combination of SIR transmission line and DGS [4] have been used to realize the desired dual stopbands with circuit size reduction. In this paper, a dual-band microstrip BSF is formed by combining a conventional open-stub BSF, a spurline and two embedded open stubs. By inserting a spurline between the two open stubs and inserting an embedded open stub into each of two open stubs, one can obtain a decent second stopband without increasing the overall circuit size. This method is very easy to realize and has no additional processing cost. All the dimensions of the filters are calculated directly on AppCAD software, which is a free RF/microwave design tool provided by Agilent. The proposed BSF is simulated and fabricated. All filter simulations are done on Sonnet Suite, which is a planar 3D EM software based on method of moments. II. BANDSTOP FILTER WITH A SPURLINE Fig. 1(a) shows the configuration of a conventional open-stub BSF. The length of the two stubs and
2
the separation between the two stubs are a quarter of the wavelength at the midband frequency [3]. The substrate material is Rogers TMM10i with a relative dielectric constant of 9.9 and a loss tangent of 0.002. The thickness of the substrate is 1.27 mm. The back of the substrate is the ground plane. The dimensions of this filter are calculated directly on AppCAD software. The width of the feed line and the open stubs is 1.2 mm, which yields a characteristic impedance of 50 Ohm. The length of the two open stubs Lo is 14.61 mm long, and the separation between the centers of the two open stubs So is also 14.61 mm. This conventional BSF is simulated on Sonnet Suite 14.52, and the results are shown in Fig. 1(b). The midband frequency is at 2.0 GHz. Spurline technique was proposed by Bates to generate BSFs [15]. The stopband happens when the length of the spurline equals a quarter of the wavelength. A spurline is realized by etching an Lshaped slot on a microstrip. Tu and Chang inserted a spurline between the two open stubs of a conventional BSF to get a deeper and wider stopband [3]. In this research, a relatively shorter spurline is first inserted between the two open stubs to get the second stopband around 3.0 GHz (Fig. 2(a)). The length of the spurline Ls is 9.87 mm. The width of the spurline Ws is at 0.80 mm, and gap of the spurline Gs is at 0.20 mm. The horizontal distance from the right edge of the left open stub to the left end of the spurline is 1.72 mm. Simulation results of this BSF are shown in Fig. 2(b). The second stopband is around 3.03 GHz, and it is very narrow. To make this second stopband wide, two embedded open stubs are needed. III. PROPOSED BANDSTOP FILTER The embedded open-circuit stub was proposed by Shaman and Hong to generate a band notch on an ultra wide band bandpass filter [16]. The notch effect occurs when the length of the embedded open stub equals a quarter of the wavelength. Two embedded open stubs are inserted into the two open stubs of the conventional BSF mentioned earlier. The layout of the BSF is shown in Fig. 3(a). The embedded open stub’s width We is set to 0.40 mm, and gap Ge is chosen as 0.20 mm. Then its length Le is calculated as 10.11 mm on AppCAD. The microstrip is still 1.20 mm wide. This BSF is also simulated on Sonnet Suite, and the simulated results are shown in Fig. 3(b). The second stopband generated from the two embedded open stubs is around 3.07 GHz. The first stopband is shifted to 1.94 GHz due to the extended electrical length in the open stubs. So that the two open stubs need to be tuned short. The proposed BSF is a combination of the conventional open-stub BSF, a spurline and two embedded open stubs. Layout of this BSF is shown in Fig. 4. The length of the spurline Ls is carefully tuned to 10.00 mm. The width of the spurline Ws is still at 0.80 mm, and gap of the spurline Gs is still at 0.20 mm. The length of two embedded open stubs Le is carefully tuned to 10.50 mm. Their width We is still at 0.40 mm, and their gap Ge is kept at 0.20 mm. The length of the two open stubs Lo is tuned to 14.30 mm to move the midband frequency of first stopband back to 2.0 GHz. The separation between the centers of the two open stubs is still kept at 14.61mm. For comparison, main dimensions
3
in Figure 1(a), Figure 2(a), Figure 3(a), and Figure 4 are listed in Table 1.
The proposed dual-band BSF is simulated and then fabricated. The 1.27 mm thick TMM10i substrate was covered by half ounce copper before fabrication. The finished metal lines are covered with a thin layer of gold. The fabricated filter (Figure 5(a) ) is then measured with an Agilent N5230A network analyzer after two-port calibration. Simulated and measured results are shown together in Fig. 5(b) for comparison. The simulated and measured results are very close to each other. The differences between measured and simulated results should be caused mainly by PCB fabrication process tolerance, substrate material property variations. The first stopband is still around 2.0 GHz, and the second stopband is around 3.0 GHz. This second stopband is wider and deeper compared with the application of a spurline only, or the application of two embedded open stubs only.
IV. SUMMARY One spurline is inserted between the two open stubs of a conventional BSF, and two embedded open stubs are inserted into the two open stubs of the conventional BSF to form a dual-band BSF. The proposed filter is simulated and fabricated. It generates the first stopband around 2.0 GHz and the second stopband around 3.0 GHz. This second stopband is wider and deeper compared with applications of a single spurline only, or the application of two embedded open stubs only.
ACKNOWLEDGMENT
The author would like to thank Dr. Montgomery, Dr. Scott, Dr. Heidary and Mr. Pryor for their assistance.
4
REFERENCES [1] J. S. Hong, Microstrip filters for RF/microwave applications, John Wiley and Sons Inc, 2011. [2] Y. Luo, and Q. X. Chu, “A compact high selectivity dual-band bandstop filter using bent L-resonators”, proceeding of the 43rd European microwave conference, Nuremberg, Oct., 2013, pp. 25-28. [3] W. H. Tu, and K. Chang, “Compact microstrip bandstop filter using open stub and spurline”, IEEE Microwave and Wireless Components Letters, vol.15, no. 4, pp. 268-270, April, 2005. [4] J. Wang, H. Ning, L. Mao, and & M. Li, M, “Miniaturized dual-band bandstop filter using defected microstrip structure and defected ground structure”, IEEE 2012 MTT-S International Microwave Symposium Digest, pp. 1-3, 2012. [5] J. Wang, H. Ning, and L. Mao, “A compact reconfigurable bandstop resonator using defected ground structure on coplanar waveguide”, IEEE Antennas and wireless propagation letters, vol. 11, pp. 457-459, April, 2012. [6] N. C. Karmakar, S. M. Roy, and I. Balbin, “Quasi-static modelling of defected ground structure”, IEEE Transactions on Microwave Theory and Techniques, vol. 54, no. 5, pp. 2160-2168, May, 2006. [7] Z. Zeng, Y. Yao, and Y. Zhuang, “A wideband common-mode suppression filter with compact-defected ground structure pattern”, IEEE Transactions on Electromagnetic Compactibility, vol. PP, issue. 99, pp. 1-4, June, 2015. [8] H. Uchida, H. Kamino, K. Totani, N. Yuneda, M. Miyazaki, Y. Konishi, S. Makino, J. Hirokawa, and M. Ando, “Dualband-rejection filter for distortion reduction in RF transmitters”, IEEE Transactions on Microwave Theory and Techniques, vo. 52, no. 11, pp2550-2556, November, 2004. [9] R. J. Cameron, M. Yu, and Y. Wang, “Direct-coupled microwave filters with single and dual stopbands”, IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 11, pp. 3288-3297, November, 2005. [10] C. H. Tsing, and T. Itoh, “Dual-band bandpass and bandstop filters using composite right/left-handed metamaterial transmission lines”, 2006 IEEE MTT-S Int. Dig., pp. 931-934, June, 2006. [11] Z. Ma, K. Kikuchi, Y. Kobayashi, T. Anada, and G. Hagiwara, “Novel microstrip dual-band bandstop filter with controllable dual-stopband response”, IEEE 2007 Asia-Pacific Microwave Conference Proceeding, pp. 1177-1180, December, 2007. [12] C. Karpuz, A. Gurur, E. Gunturkun, and A. K. Gorur, “Asymmetric response dual-mode dual-band bandstop filters having simple and understandable topology”, IEEE 2009 Asia Pacific Microwave Conference Proceeding, pp. 925-928, 2009. [13] K. S. Chin, J. H. Yeh, and S. H. Chao, “Compact dual-band bandstop filters using stepped-impedance resonators”, IEEE Microwave and Wireless Components Letters, vol. 17, no. 12, pp. 849-851, December, 2007. [14] X. Hu, Q. Zhang, and S. He, “Dual-band-rejection filter based on split ring resonator (SRR) and complimentary SRR”, Microwave and Optical Technology Letters, vol. 51, no. 10, October, 2009. [15] R. N. Bates, “Design of microstrip spur-line band-stop filters”. IEE Journal on Microwave, Optics, and Acoustics, vol.1, no.6, pp. 209-214, November, 1977. [16] H. Shaman, and J. S. Hong, “Ultra-wideband bandpass filter with embedded band notch structures”, IEEE Microwave and Wireless Components Letters, vol. 17, no.3, pp. 193-195, March, 2007.
5
Fig. 1(a). Layout of a conventional open-stub BSF.
Fig. 1(b). Simulation results of the conventional open-stub BSF.
6
Fig. 2(a). Layout of a BSF having a spurline.
Fig. 2(b). Simulation results of the BSF having a spurline.
7
Fig. 3(a). Layout of a BSF having two embedded open stubs.
Fig. 3(b). Simulation results of the BSF having two embedded open stubs.
8
Fig. 4. Layout of the proposed BSF.
9
Fig. 5(a). Picture of the fabricated filter.
Fig. 5(b). Simulation and measurement results of the proposed BSF.
10
Table 1. Main dimensions in simulations Dimension
Figure 1(a)
Figure 2(a)
Figure 3(a)
Figure 4
Lo (mm)
14.61
14.61
14.61
14.30
So (mm)
14.61
14.61
14.61
14.61
Ls (mm)
9.87
10.00
Ws (mm)
0.80
0.80
Gs (mm)
0.20
0.20
Le (mm)
10.11
10.50
We (mm)
0.40
0.40
Ge (mm)
0.20
0.20
11
S2314-7172(16)30028-9 http://dx.doi.org/doi:10.1016/j.jesit.2015.12.004 JESIT 83
To appear in: Received date: Revised date: Accepted date:
8-9-2015 4-12-2015 27-12-2015
Please cite this article as: {http://dx.doi.org/ This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
A Compact Dual-Band Bandstop Filter Having One Spurline and Two Embedded Open Stubs Shujun Yang
Dept. of EE and CS, Alabama A&M University, Huntsville, AL 35810, USA, [email protected]
1
Abstract— A compact dual-band microstrip bandstop filter (BSF) is presented. It combines a conventional open-stub BSF, a spurline, and two embedded open stubs. This BSF is simulated and fabricated. It generates two stopbands around 2.0 GHz and 3.0 GHz without increasing circuit size, compared with the conventional BSF. Index Terms— Bandstop filter, embedded open stub, spurline.
I. INTRODUCTION BSFs are used to cut off unwanted signals at certain frequencies. Microstrip BSFs are being widely used in local oscillators, mixers, duplexers, switches, and other microwave subsystems. Various techniques have been developed to synthesize and design microstrip BSFs [1]. In general, there are at least three ways to design microstrip BSFs [2]. The first way is to place resonators in parallel with the main transmission line [1]. At resonant frequencies, the resonators take energy from the main transmission line through coupling. The second way to design microstrip BSFs is to tap resonators, such as open stubs, to the main transmission line [3]. The third way to design microstrip BSFs is to use defected ground structures (DGS) [4-7]. Dual-band BSFs are highly desired in many applications for their two separate stopbands. Conventionally, a dual-band microstrip BSF can be obtained by cascading two different BSFs. The side effects are the high insertion loss in the passband and increased circuit size. Varies methods have been proposed to form dual-band microwave BSFs. The dual stopbands can be obtained through frequency-variable transformation to the lowpass prototype [8] and cul-de-sac configuration [9], and the application of right/left-handed metamaterials [10], parallel open stubs at different lengths [11] and dual mode ring oscillators [12]. Size reduction of dual-band BSFs has been a hot research topic in recent years [4]. Stepped impedance resonators (SIR) [13], split ring resonators [14], and the combination of SIR transmission line and DGS [4] have been used to realize the desired dual stopbands with circuit size reduction. In this paper, a dual-band microstrip BSF is formed by combining a conventional open-stub BSF, a spurline and two embedded open stubs. By inserting a spurline between the two open stubs and inserting an embedded open stub into each of two open stubs, one can obtain a decent second stopband without increasing the overall circuit size. This method is very easy to realize and has no additional processing cost. All the dimensions of the filters are calculated directly on AppCAD software, which is a free RF/microwave design tool provided by Agilent. The proposed BSF is simulated and fabricated. All filter simulations are done on Sonnet Suite, which is a planar 3D EM software based on method of moments. II. BANDSTOP FILTER WITH A SPURLINE Fig. 1(a) shows the configuration of a conventional open-stub BSF. The length of the two stubs and
2
the separation between the two stubs are a quarter of the wavelength at the midband frequency [3]. The substrate material is Rogers TMM10i with a relative dielectric constant of 9.9 and a loss tangent of 0.002. The thickness of the substrate is 1.27 mm. The back of the substrate is the ground plane. The dimensions of this filter are calculated directly on AppCAD software. The width of the feed line and the open stubs is 1.2 mm, which yields a characteristic impedance of 50 Ohm. The length of the two open stubs Lo is 14.61 mm long, and the separation between the centers of the two open stubs So is also 14.61 mm. This conventional BSF is simulated on Sonnet Suite 14.52, and the results are shown in Fig. 1(b). The midband frequency is at 2.0 GHz. Spurline technique was proposed by Bates to generate BSFs [15]. The stopband happens when the length of the spurline equals a quarter of the wavelength. A spurline is realized by etching an Lshaped slot on a microstrip. Tu and Chang inserted a spurline between the two open stubs of a conventional BSF to get a deeper and wider stopband [3]. In this research, a relatively shorter spurline is first inserted between the two open stubs to get the second stopband around 3.0 GHz (Fig. 2(a)). The length of the spurline Ls is 9.87 mm. The width of the spurline Ws is at 0.80 mm, and gap of the spurline Gs is at 0.20 mm. The horizontal distance from the right edge of the left open stub to the left end of the spurline is 1.72 mm. Simulation results of this BSF are shown in Fig. 2(b). The second stopband is around 3.03 GHz, and it is very narrow. To make this second stopband wide, two embedded open stubs are needed. III. PROPOSED BANDSTOP FILTER The embedded open-circuit stub was proposed by Shaman and Hong to generate a band notch on an ultra wide band bandpass filter [16]. The notch effect occurs when the length of the embedded open stub equals a quarter of the wavelength. Two embedded open stubs are inserted into the two open stubs of the conventional BSF mentioned earlier. The layout of the BSF is shown in Fig. 3(a). The embedded open stub’s width We is set to 0.40 mm, and gap Ge is chosen as 0.20 mm. Then its length Le is calculated as 10.11 mm on AppCAD. The microstrip is still 1.20 mm wide. This BSF is also simulated on Sonnet Suite, and the simulated results are shown in Fig. 3(b). The second stopband generated from the two embedded open stubs is around 3.07 GHz. The first stopband is shifted to 1.94 GHz due to the extended electrical length in the open stubs. So that the two open stubs need to be tuned short. The proposed BSF is a combination of the conventional open-stub BSF, a spurline and two embedded open stubs. Layout of this BSF is shown in Fig. 4. The length of the spurline Ls is carefully tuned to 10.00 mm. The width of the spurline Ws is still at 0.80 mm, and gap of the spurline Gs is still at 0.20 mm. The length of two embedded open stubs Le is carefully tuned to 10.50 mm. Their width We is still at 0.40 mm, and their gap Ge is kept at 0.20 mm. The length of the two open stubs Lo is tuned to 14.30 mm to move the midband frequency of first stopband back to 2.0 GHz. The separation between the centers of the two open stubs is still kept at 14.61mm. For comparison, main dimensions
3
in Figure 1(a), Figure 2(a), Figure 3(a), and Figure 4 are listed in Table 1.
The proposed dual-band BSF is simulated and then fabricated. The 1.27 mm thick TMM10i substrate was covered by half ounce copper before fabrication. The finished metal lines are covered with a thin layer of gold. The fabricated filter (Figure 5(a) ) is then measured with an Agilent N5230A network analyzer after two-port calibration. Simulated and measured results are shown together in Fig. 5(b) for comparison. The simulated and measured results are very close to each other. The differences between measured and simulated results should be caused mainly by PCB fabrication process tolerance, substrate material property variations. The first stopband is still around 2.0 GHz, and the second stopband is around 3.0 GHz. This second stopband is wider and deeper compared with the application of a spurline only, or the application of two embedded open stubs only.
IV. SUMMARY One spurline is inserted between the two open stubs of a conventional BSF, and two embedded open stubs are inserted into the two open stubs of the conventional BSF to form a dual-band BSF. The proposed filter is simulated and fabricated. It generates the first stopband around 2.0 GHz and the second stopband around 3.0 GHz. This second stopband is wider and deeper compared with applications of a single spurline only, or the application of two embedded open stubs only.
ACKNOWLEDGMENT
The author would like to thank Dr. Montgomery, Dr. Scott, Dr. Heidary and Mr. Pryor for their assistance.
4
REFERENCES [1] J. S. Hong, Microstrip filters for RF/microwave applications, John Wiley and Sons Inc, 2011. [2] Y. Luo, and Q. X. Chu, “A compact high selectivity dual-band bandstop filter using bent L-resonators”, proceeding of the 43rd European microwave conference, Nuremberg, Oct., 2013, pp. 25-28. [3] W. H. Tu, and K. Chang, “Compact microstrip bandstop filter using open stub and spurline”, IEEE Microwave and Wireless Components Letters, vol.15, no. 4, pp. 268-270, April, 2005. [4] J. Wang, H. Ning, L. Mao, and & M. Li, M, “Miniaturized dual-band bandstop filter using defected microstrip structure and defected ground structure”, IEEE 2012 MTT-S International Microwave Symposium Digest, pp. 1-3, 2012. [5] J. Wang, H. Ning, and L. Mao, “A compact reconfigurable bandstop resonator using defected ground structure on coplanar waveguide”, IEEE Antennas and wireless propagation letters, vol. 11, pp. 457-459, April, 2012. [6] N. C. Karmakar, S. M. Roy, and I. Balbin, “Quasi-static modelling of defected ground structure”, IEEE Transactions on Microwave Theory and Techniques, vol. 54, no. 5, pp. 2160-2168, May, 2006. [7] Z. Zeng, Y. Yao, and Y. Zhuang, “A wideband common-mode suppression filter with compact-defected ground structure pattern”, IEEE Transactions on Electromagnetic Compactibility, vol. PP, issue. 99, pp. 1-4, June, 2015. [8] H. Uchida, H. Kamino, K. Totani, N. Yuneda, M. Miyazaki, Y. Konishi, S. Makino, J. Hirokawa, and M. Ando, “Dualband-rejection filter for distortion reduction in RF transmitters”, IEEE Transactions on Microwave Theory and Techniques, vo. 52, no. 11, pp2550-2556, November, 2004. [9] R. J. Cameron, M. Yu, and Y. Wang, “Direct-coupled microwave filters with single and dual stopbands”, IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 11, pp. 3288-3297, November, 2005. [10] C. H. Tsing, and T. Itoh, “Dual-band bandpass and bandstop filters using composite right/left-handed metamaterial transmission lines”, 2006 IEEE MTT-S Int. Dig., pp. 931-934, June, 2006. [11] Z. Ma, K. Kikuchi, Y. Kobayashi, T. Anada, and G. Hagiwara, “Novel microstrip dual-band bandstop filter with controllable dual-stopband response”, IEEE 2007 Asia-Pacific Microwave Conference Proceeding, pp. 1177-1180, December, 2007. [12] C. Karpuz, A. Gurur, E. Gunturkun, and A. K. Gorur, “Asymmetric response dual-mode dual-band bandstop filters having simple and understandable topology”, IEEE 2009 Asia Pacific Microwave Conference Proceeding, pp. 925-928, 2009. [13] K. S. Chin, J. H. Yeh, and S. H. Chao, “Compact dual-band bandstop filters using stepped-impedance resonators”, IEEE Microwave and Wireless Components Letters, vol. 17, no. 12, pp. 849-851, December, 2007. [14] X. Hu, Q. Zhang, and S. He, “Dual-band-rejection filter based on split ring resonator (SRR) and complimentary SRR”, Microwave and Optical Technology Letters, vol. 51, no. 10, October, 2009. [15] R. N. Bates, “Design of microstrip spur-line band-stop filters”. IEE Journal on Microwave, Optics, and Acoustics, vol.1, no.6, pp. 209-214, November, 1977. [16] H. Shaman, and J. S. Hong, “Ultra-wideband bandpass filter with embedded band notch structures”, IEEE Microwave and Wireless Components Letters, vol. 17, no.3, pp. 193-195, March, 2007.
5
Fig. 1(a). Layout of a conventional open-stub BSF.
Fig. 1(b). Simulation results of the conventional open-stub BSF.
6
Fig. 2(a). Layout of a BSF having a spurline.
Fig. 2(b). Simulation results of the BSF having a spurline.
7
Fig. 3(a). Layout of a BSF having two embedded open stubs.
Fig. 3(b). Simulation results of the BSF having two embedded open stubs.
8
Fig. 4. Layout of the proposed BSF.
9
Fig. 5(a). Picture of the fabricated filter.
Fig. 5(b). Simulation and measurement results of the proposed BSF.
10
Table 1. Main dimensions in simulations Dimension
Figure 1(a)
Figure 2(a)
Figure 3(a)
Figure 4
Lo (mm)
14.61
14.61
14.61
14.30
So (mm)
14.61
14.61
14.61
14.61
Ls (mm)
9.87
10.00
Ws (mm)
0.80
0.80
Gs (mm)
0.20
0.20
Le (mm)
10.11
10.50
We (mm)
0.40
0.40
Ge (mm)
0.20
0.20
11