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RF Bandpass Filter 學學 學學學 E-mail [email protected]

RF Bandpass Filter 學生:陳昱夫 E-mail : [email protected]

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RF Bandpass Filter 學生:陳昱夫 E-mail : [email protected]. Ultra-Wideband (UWB) Bandpass Filter With Embedded Band Notch Structures (1). Proposed UWB BPF with embedded band notch stubs. Predicted and the measured results for Filter-A with the FCC indoor mask. - PowerPoint PPT Presentation

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Page 1: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

RF Bandpass Filter

學生:陳昱夫

E-mail : [email protected]

Page 2: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Ultra-Wideband (UWB) Bandpass FilterWith Embedded Band Notch Structures (1)

Proposed UWB BPF with embedded band notch stubs.

Predicted and the measured results for Filter-A with the FCC indoormask.

Page 3: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Ultra-Wideband (UWB) Bandpass FilterWith Embedded Band Notch Structures (2)

Schematic diagrams of (a) conventional open-circuited stub, (b) spurline, and (c) proposed embedded open-circuited stub.

Insertion loss of the embedded stub with varying gap for Ws =0.1mm and Wc = 1.3 mm.

Full-wave EM simulation of the complete layout of the designed UWB BPF with varying equal stub lengths.

Page 4: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Ultra-Wideband (UWB) Bandpass FilterWith Embedded Band Notch Structures (3)

• 製作於 FR4 板、介電常數為 3.05 基板高度 0.508 損失 0.025• 不具有傳輸零點• 具有一個可調式 notched band• 結構尺寸 22.2mm X 15.1mm ,大約為

1.07λg X 0.54λg 。• 中心頻率在 5.83GHz

Page 5: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

IE3D 模擬

Page 6: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Investigation in Open Circuited Metal LinesEmbedded in Defected Ground Structure

and Its Applications to UWB Filters (1)

Schematic diagrams of (a) top view of proposed UWB BPF, (b) bottom view of proposed UWB BPF, (c) top view of proposed UWB BPF with notch band implementation, (d) bottom view of proposed UWB BPF with notch band implementation

Simulated and measured results of Fabricated UWB BPF.

Page 7: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Investigation in Open Circuited Metal LinesEmbedded in Defected Ground Structure

and Its Applications to UWB Filters (2)• 製作於 FR4 板、介電常數為 4.4 、基板高度 0.8 、損失為 0.025 。• 具有兩個傳輸零點,分別在 1.65GHz 和

11.36GHz 。• 具有一個 notched band 。 ( 只可控制頻寬 )• 結構尺寸 11.7mm X 6.3mm 、大約為

0.41λg X 0.22λg 。• 中心頻率為 5.5GHz

Page 8: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

IE3D 模擬

Page 9: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Ultra Wideband Bandpass Filter with Dual Notch Bands (1)

Simulated and measured frequency responses and (b)group delay of the fabricated UWB BPF. The dimensions are W1 = 0.1, W 2 = 0.7, W 3 = W 5 = 1.8, W 4 = 0.7, Lc = 4, L1 = 4.4, L2 = L4 = 2, L3 = 3.3, L5 = 4.2, d = 4.2, S1 = 0.1, S2 = S3 = 0.2. All are in mm.

Structure of the proposed UWB filter

Page 10: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Ultra Wideband Bandpass Filter with Dual Notch Bands (2)

(a) Structure of the square etched MMR and (b) |S21|- magnitude of the MMR with different coupled line lengths (Lc).

|S21|-magnitude

Page 11: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Ultra Wideband Bandpass Filter with Dual Notch Bands (3)

|S21|-magnitude in comparisonof SIR 1 SIR 2 with tuning 1.

Page 12: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Ultra Wideband Bandpass Filter with Dual Notch Bands (4)

• 製作於 Duroid 6010 板、介電常數為10.2 、基板高度為 1.27 、損失 0.0023 。

• 整個通帶從 3.1GHz~11GHz 。• 不具有傳輸零點。• 具有兩個可調式 notched band 。• 結構尺寸為 13.4mm X 8.62mm 。

Page 13: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

IE3D 模擬

Page 14: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Compact Ultra-Wideband Bandpass FilterUsing Dual-Line Coupling Structure(1)

Topology of the compact UWB BPF Simulated and measured results of the fabricated BPF with spuriousresponse suppression.

Page 15: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

Compact Ultra-Wideband Bandpass FilterUsing Dual-Line Coupling Structure(3)

S-parameters and group delay of the UWB BPF.

超寬帶帶通 4.9 和 10.9GHz 返回損失超過 15db 從 5.7 至

10.7GHz在 1 分貝插入損耗約 5GHz 帶寬,最小插入損耗為 0.49 dB 的

7.3GHz 。

Page 16: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

IE3D 模擬

Page 17: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

A New Dual-Band Microstrip BandpassFilter Using Net-Type Resonators

Page 18: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

INTRODUCTION

λ/2 SIRs shown in Fig. 1(a-1) and (a-2) are employed to design dual-band filters with two passbands at frequencies ƒ1 and ƒ2 (ƒ2 > ƒ1) . The frequency ratio ƒ2/ƒ1 determines which type of SIRs ( K <1 or K>1 ) should be adopted.

Page 19: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

INTRODUCTION

λ/4 SIR shown in Fig. 1(b-1) was evolved into the net-type resonator [9] depicted in Fig. 1(c-1) and (d-1), and then exploited to design a single passband filter.

Page 20: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

INTRODUCTIONthe net-type resonator in the K>1 region shown in Fig. 2 is developed to achieve two closely specified resonant frequencies. The filter developed in this letter not only has two transmission zeros to improve the selectivity of each passband, but also providesa wide stopband suppression and an excellent mid-bandrejection between two passbands.

Fig. 2. Spurious resonant frequencies of the λ/4 stepped-impedance resonatorWith K=Z2/Z1 <1 and K=Z2/Z1 >1

Page 21: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

DUAL-BAND NET-TYPE RESONATOR

• To design the λ/4 SIR with two close resonant frequencies, ƒ1 and ƒ2 (ƒ2/ƒ1 ≈ 2). It is comprised of two transmission lines with the equal electrical length and the impedance ratio K=Z2/Z1 > 1.

• The high impedance (Z2) line is kept open-circuitedwhile the low impedance (Z1) line is connected to theground. Hence, the first two resonant frequencies f1

and f2 (f2 > f1) of this λ/4 SIR

Page 22: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

DUAL-BAND NET-TYPE RESONATOR

The low impedance line can be equivalent to three parallelconnected stubs as shown in Fig. 1(c-2).

Since the electrical lengths of two sections of the SIR are set to equal,the net-type resonator can be folded to a square box shape as shown in Fig. 1(d-2).

Page 23: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

DUAL-BAND NET-TYPE RESONATOR

Fig. 3. Resonant frequencies of the net-type resonator with K = 1.57 and 3.

Note that neither the value of K nor ƒ2/ƒ1 is restricted to an integer. Fig. 3 shows the resonant frequencies of the net-type resonators with K = 1.57 (ƒ2/ƒ1 = 2.5) and K = 3 (ƒ2/ƒ1 = 3)

Page 24: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

DESIGN OF DUAL-BAND FILTER

(a) Coupling structure

The resonators 1 and 4 are designedto simultaneously operate at the center frequencies ƒ1 and ƒ2 of he first and second passbands.

The resonators 2I and 3I are designed to operate at ƒ1

while the resonators 2II and 3II are designed to operate at ƒ2

Page 25: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

DESIGN OF DUAL-BAND FILTER

schematic layout of the dual-band BPFusing net-type resonators.

The filter is fabricated on a RO4003 substrate with a thickness of 0.508 mm, a dielectric constant of 3.38, and a loss tangent of 0.0027.The center frequencies of two passbands are setTo ƒ1 =1 GHz and ƒ2 =2 GHz

Page 26: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

DESIGN OF DUAL-BAND FILTER• Substituting ƒ1 and ƒ2 into (1), one can obtain the impedance ratio K

= 3 , and then calculate the electrical length Ɵ = 60o

(1)

• using (2). Here Z1 and Z2 are chosen as 60Ω and 20Ω , respectively.

(2)

• The fractional bandwidths (FBWs) of first and second passbands are ∆1 = 4.6% and ∆ 2 = 4.8%

Page 27: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

SIMULATED AND MEASURED RESULTS

Circuit photograph of the developed filter.

It occupies a circuit size of 41.83 X 31.73 mm2. The simulated and measured results are illustrated in Fig. 5(b), and their enlarged views of the responses are given in Fig. 5(c).

Simulated and measured results covering two passbands and their

enlarged views of responses.

Page 28: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

SIMULATED AND MEASURED RESULTS

• the mid-band rejection between two passbands is greater than 40 dB from 1.14 GHz to 1.75 GHz.

• It is because the open stub in the resonator 1 or 4 individually gives a transmission zero at around 1.5 GHz.

• then the coupling between resonators 1 and 4 makes two transmission zeros split at 1.33 and 1.55 GHz.

Page 29: RF  Bandpass  Filter  學生:陳昱夫 E-mail : ksu.chenyufu@gmail.com

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