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1.
双频带通滤波器的优化设计 总被引:1,自引:0,他引:1
孟令琴 《固体电子学研究与进展》2010,30(2)
利用阶跃阻抗谐振器优化,设计了一个工作在无线局域网(2.4/5.2GHz)的双频带通滤波器。通过奇、偶模分析,在阶跃阻抗谐振器理论计算公式基础上,根据不同的阻抗比条件,阶跃阻抗谐振器谐振频率比与阶跃阻抗高、低阻抗电长度之比的关系曲线,可以方便地确定阶跃阻抗谐振器的谐振频率和电长度,通过sonnet电路仿真软件验证了设计的合理性,并给出了用于无线通信2.4、5.2 GHz双频带通滤波器的设计结果。该带通滤波器可以分别在2.4、5.2 GHz处得到较好的通带性。由于交叉耦合的存在,该双频带通滤波器在两个通带端各有一个传输零点,以此来提高滤波器的通带频率选择性。最后,测量结果与仿真结果基本吻合。 相似文献
2.
Compact dual-band bandpass filter (BPF) for the 5th generation mobile communication technology (5G) radio frequency (RF) front-end applications was presented based on multilayer stepped impedance resonators (SIRs). The multilayer dual-band SIR BPF can achieve high selectivity and four transmission zeros (TZs) near the passband edges by the quarter-wavelength tri-section SIRs. The multilayer dual-band SIR BPF is fabricated on a 3-layer FR-4 substrate with a compact dimension of 5.5 mm ×5.0 mm ×1.2 mm. The measured two passbands of themultilayer dual-band SIR BPF are 3.3 GHz -3.5 GHz and 4.8 GHz -5.0 GHz with insertion loss (IL) less than 2 dB respectively. Both measured and simulated results suggest that it is a possible candidate for the application of 5G RF front-end at sub-6 GHz frequency band. 相似文献
3.
《AEUE-International Journal of Electronics and Communications》2014,68(5):384-387
A miniaturized dual-band bandpass filter (BPF) using stepped impedance resonator (SIR) and defected ground structure (DGS) is presented. In order to get two desired passbands, two different transmission paths and source–load cross coupling have been implemented. One path is the SIR, and the other is the DGS. Meanwhile, it is easy to obtain good frequency selectivity by introducing several transmission zeros. The coupling scheme and current distributions are applied to demonstrate the flexible design approach. A dual-band BPF is designed, simulated, and fabricated to demonstrate the performance of the proposed dual-band filter. The measured results show that the fabricated dual-band BPF has two passbands centered at 2.41 and 3.52 GHz with the fractional bandwidth of 5.8 and 7.7%, respectively. The measured insertion loss is about 2 dB and 2.2 dB at the lower and upper passbands. The measured results show good agreement with the simulated ones. 相似文献
4.
《Microwave and Wireless Components Letters, IEEE》2008,18(5):320-322
This letter presents a miniaturized dual-band narrow bandpass filter (BPF) using meandering stepped impedance resonators (SIRs) with a new coupling scheme, which exhibited a size reduction of 50% compared with the traditional direct coupling structure at the same frequency, while the new structure can generate three transmission zeros in the insertion loss response. To validate the design and analysis, two dual-band BPFs centered at 2.4-GHz/5.2-GHz and 2.4-GHz/5.7-GHz for WLAN application were fabricated and measured. It is shown that the measured and simulated performances are in good agreement. The BPFs achieved insertion loss of less than 2 dB and return loss of greater than 16-dB in each band. 相似文献
5.
《Microwave and Wireless Components Letters, IEEE》2009,19(12):780-782
6.
单槽双频微波带通滤波器设计与实现 总被引:1,自引:1,他引:0
在方形贴片上采用单槽线代替相互正交双槽线的方法设计出一款结构简单、紧凑的双频段带通滤波器。详细讨论了滤波器结构参数对滤波器性能的影响,并以2.45/5.2GHz双通带滤波器的设计为例,通过仿真优化得到了各结构参数,制作了相应的样品。测试结果表明:该滤波器在2.45GHz通带内回波损耗为20dB,通带内最小插损为0.9dB,相对带宽为10%;5.2GHz通带内回波损耗33.6dB,通带内最小插损为0.37dB,相对带宽为13.4%,其总体尺寸比文献中正交双槽线结构的滤波器缩小48%。 相似文献
7.
A novel dual-mode dual-band bandpass filter (BPF) is proposed that uses a bi-interdigital coupling structure for a single substrate configuration. The BPF consists of a microstrip feed network, ground embedded slots, and outer and inner loop resonators which are excited over bi-interdigital coupled lines with tight coupling in the two passbands. The filter design, analysis via the equivalent circuit of the proposed BPF and the experimented results are dealt with. 相似文献
8.
9.
《Microwave and Wireless Components Letters, IEEE》2007,17(6):430-432
A quasi-elliptic function dual-band bandpass filter (BPF) stacking spiral-shaped coplanar waveguide defected ground structure and back-side coupled strip lines is proposed, which allow two transmission paths to radio frequency signals. Each of them has quasi-elliptic characteristics and results in a respective passband. This can provide convenience to change one passband operating frequency independently of the other one. Several attenuation poles in the stopband are realized to improve the selectivity of the proposed BPF. Theoretical and experimental results with good agreement are presented 相似文献
10.
Wireless Personal Communications - A novel approach to design dual-band as well as a triple-band BPF with improved isolation is ventured in this paper. In dual-band filter, dual mode property of... 相似文献
11.
In this paper, two compact tuneable bandpass filters (BPFs) based on the coupled feed lines are introduced. To approach a compact size, the coupled feed lines are bended. To design a high performance single-band bandpass filter (BPF), coupled feed lines are loaded by T-shaped stubs (as main resonators) and rectangular stubs (as suppressor stubs). Also, the mechanism of coupled feed lines combining with T-shaped open stubs is analyzed to show a tunable passband. The dual-band BPF includes two big radial-stubs, two small radial-stubs, two T-shaped structures and spiral coupled feed lines. The LC model of big radial-stubs is analyzed to compute the equation of transmission zero using its transfer function. The passband frequency of single-band BPF resonates at 2.12 GHz (3G) with corresponded insertion loss of 0.83 dB. Also, for dual-band BPF, the measured insertion-losses of first and second passbands are close to 0.8 and 1.1 dB, respectively. The frequency responses of BPFs are easily adjusted by altering the physical dimensions, demonstrating a adjustable performance. To verify the correct operation of circuits, the proffered filters are implemented and tested. 相似文献
12.
Jung-Woo Baik Tae-Hak Lee Young-Sik Kim 《Microwave and Wireless Components Letters, IEEE》2007,17(12):846-848
A novel ultra-wideband bandpass filter (BPF) is presented using a back-to-back microstrip-to-coplanar waveguide (CPW) transition employed as the broadband balun structure in this letter. The proposed BPF is based on the electromagnetic coupling between open-circuited microstrip line and short-circuited CPW. The equivalent circuit of half of the filter is used to calculate the input impedance. The broadband microstip-to-CPW transition is designed at the center frequency of 6.85 GHz. The simulated and measured results are shown in this letter. 相似文献
13.
Xuehui Guan Zhewang Ma Peng Cai Kobayashi Y. Anada T. Hagiwara G. 《Microwave and Wireless Components Letters, IEEE》2006,16(3):110-112
A novel method is proposed to synthesize dual-band bandpass filters (BPFs) from a prototype low-pass filter. By implementing successive frequency transformations and circuit conversions, a new filter topology is obtained which consists of only admittance inverters and series resonators, and is thereby easy to be realized by using conventional distributed elements. A dual-band BPF with center frequencies of 1.8GHz and 2.4GHz is designed and fabricated using microstrip lines and stubs. The simulated and measured results show a good agreement and validate the proposed theory. 相似文献
14.
张友俊 《固体电子学研究与进展》2009,29(1)
提出了一种新型的周期结构双频微带带通滤波器(BPF——Bandpass filter),该结构由刻蚀在补偿微带线微带两边的两个不同周期结构构成,在3.72GHz和6.01GHz频率范围内获得了两个通带,该滤波器具有低的插入损耗、紧凑的结构和好的选择性,仿真结果和实验结果符合较好。 相似文献
15.
《Microwave and Wireless Components Letters, IEEE》2008,18(9):581-583
16.
Kuan H. Lin Y.-L. Yang R.-Y. Chang Y.-C. 《Microwave and Wireless Components Letters, IEEE》2010,20(1):25-27
17.
《Antennas and Propagation, IEEE Transactions on》2006,54(9):2632-2637
A technique for tuning a single-element planar inverted F-antenna (PIFA) to provide a dual-band operation is introduced. The tuning is possible due to the particular impedance level typical to radio-frequency identification microchips. As the desired impedance level resides near the outer rim of the Smith chart, a single impedance locus may be arranged to pass the input impedance twice resulting in dual-band operation. The tuning of the impedance locus is based on the feed inductance and capacitive coupling at the open end of the patch. In this paper, also a discussion about the principles of platform tolerance of small antennas is provided. A design, circuit model, simulations, and measurement results of dual-band platform tolerant PIFAs are reported and discussed. 相似文献
18.
为了满足无线通信系统对低功耗双频功放的需求,分析高效功放的阻抗条件,提出了一种新型双频输出匹配电路,包括谐波控制电路和基波匹配电路两部分.首先,通过调谐晶体管的谐波阻抗减小漏极电压和漏极电流波形的重叠,从而提高功放的效率;其次,通过公式推导得出双频阻抗匹配电路参数,将晶体管在两个频率下的最佳基波阻抗匹配至50Ω.为验证... 相似文献
19.
Young-Ho Cho Hyung-Il Baek Haeng-Seon Lee Sang-Won Yun 《Microwave and Wireless Components Letters, IEEE》2009,19(10):626-628
This letter presents a dual-band combline bandpass filter (BPF) loaded by lumped series resonators. The proposed filter configuration can easily generate two desired passbands by controlling the resonant frequencies of the comblines as well as the series resonators. Furthermore, the skirt frequency characteristics between the two passbands are improved by transmission zeros introduced by source-load coupling via a lumped element capacitor. Two-pole dual-BPF with center frequencies of 1.2 and 1.54 GHz is designed and the measured results agree well with simulated results. 相似文献
20.
We demonstrate a laser-diode(LD)pumped actively Q-switched laser with Nd:Sc0.2Y0.8Si O5(Nd:SYSO)crystal for the first time.A stable actively Q-switched laser is obtained at dual wavelengths of 1 075.2 nm and 1 078.2 nm.The maximum average output power of 720 m W is obtained at the repetition rate of 15 k Hz under the pump power of8.7 W.The minimum pulse width of 58 ns is obtained at the repetition rate of 5 k Hz under the pump power of 8.7 W,corresponding to the peak power of 1.9 k W and the pulse energy of 112μJ. 相似文献