共查询到20条相似文献,搜索用时 15 毫秒
1.
A miniature dual-band filter using quarter wavelength (lambdag/4) stepped impedance resonators (SIRs) is proposed. Short and open SIRs are coupled together to realize lower and upper passbands, respectively. Miniaturization is achieved due to the use of lambdag/4 resonators and a combline coupling structure. Two transmission zeros in a mid-stopband and one in each lower and upper stopbands are achieved. In order to see the capability of this structure to achieve different second passband frequencies, two dual band filters at frequencies of 2.45/5.25 GHz and 2.45/5.75 GHz are realized. Measured insertion losses are 1.3 dB and 2.3 dB and return losses are better than 17 dB and 18 dB at the first and second passband frequencies, respectively, with a mid-stopband attenuation better than 30 dB. The size of the filter is as compact as 19.0 times 5.2 mm2 on a RO 4003C (epsivr = 3.38, h = 0.81 mm) substrate. 相似文献
2.
A bandpass filter based on complementary split ring resonators (CSRRs) and implemented in MCM-D technology is presented for the first time. It is a thin-film microstrip structure with CSRRs etched in the ground plane and interdigital capacitors in the signal strip. In addition, the structure includes grounded stubs. The combination of CSRRs and such stubs is useful to generate a transmission zero above the left-hand passband of the filter, and thus improve frequency selectivity. The filter, consisting of two CSRR cells, has a central frequency of fo=19 GHz and a fractional bandwidth of FWB=18%. Inband return losses (RL=-15 dB) are satisfactory, while insertion losses (IL=-7.4 dB) are affected by the very small size of the resonant elements. Filter size is as small as 918times450 mum, i.e. 0.094 lambdagtimes0.045lambdag, where lambdag is the guided wavelength at fo. The implementation of these metamaterial-based structures in MCM-D technology opens new directions for the synthesis of ultra-small filters operating at millimetre wavelengths 相似文献
3.
《Microwave and Wireless Components Letters, IEEE》2006,16(11):600-602
Complementary split ring resonators are used to design compact, low insertion loss (IL), low pass filter with sharp cut-off. A prototype filter implementing area is 0.23 lambdagtimes0.09lambda g, lambdag being the guided wavelength at 3-dB cut-off frequency (fc) 1.887GHz. Maximum IL is within 0.5dB up to 1.717GHz and 20-dB stopband extends up to 3.4fc 相似文献
4.
Kuo-Ken Huang Meng-Ju Chiang Tzuang C.-K.C. 《Microwave and Wireless Components Letters, IEEE》2008,18(2):94-96
This letter presents a low-power active bandpass filter (BPF) at K-band fabricated by the standard 0.18 mum 1P6M CMOS technology. The proposed filter is evolved from the conventional half-wavelength resonator filter, using the complementary-conducting-strip transmission line (CCS TL) as the half-wavelength resonator. Furthermore, the complementary MOS cross-couple pair is proposed as a form of current-reuse scheme for achieving low-power consumption and high Q-factor simultaneously. The simulated results indicate that the Q-factor of the proposed half-wavelength resonator can be boosted from 9 to 513 at 25.65 GHz compared with the resonator enhanced by the nMOS cross-couple pair to Q-factor of merely 43 under the same power consumption. The proposed active BPF of order two occupies the chip area of 360 mum times 360 mum without contact pads. The measured results show that the center frequency of the active BPF is 22.70 GHz and a bandwidth of 1.68 GHz (7.39 %). The measured P1 dB and noise figure at 22.70 GHz are -7.65 dBm and 14.05 dB, respectively. There is a 56.84 dB suppression between the fundamental tone and the second harmonic when the input power is -11.26 dBm. While showing 0 dB loss and some residual gain, the active BPF consumes 2.0 mA at 1.65 V supply voltage with maximum of 0.15 dB insertion loss and 9.96 dB return loss at pass band. 相似文献
5.
A compact filter for ultra-wideband (UWB) applications is proposed and developed through quasi-equal allocation of the first three resonant frequencies of a stub-loaded resonator together with strong input/output excitation. Measured results show low insertion loss and flat group delay in the entire passband as well as a wide stopband. The size for this single-layer UWB filter without feeding lines is only 9.5times5 mm (0.53 lambdagtimes0.28 lambdag in which lambdag is the guided wavelength of 50 microstrip at the centre frequency). 相似文献
6.
A dual-mode dual-bandpass filter for the U-NII bands is proposed and demonstrated. Its effective size reduction is achieved by using a multilayer configuration. The first and the third layers incorporate microstrip dual-mode bandpass filters with operating center-frequencies of f1 =5.2 GHz and f2 =5.8 GHz, respectively. The second layer is used as a common ground plane for both filters, which also serves as a decoupling interface. Capacitive coupling transition is used to connect both filters to I/O coplanar waveguide (CPW) ports. Single and dual-band passband filter prototypes are designed, fabricated, and measured in this work, thus validating the design principle. Designed topologies of single passband filters with center frequencies of 5.2 and 5.8 GHz exhibit an out-of-band rejection better than 40 dB with a 3 dB bandwidth of 5.8% and 6%, respectively. The proposed multilayer dual-passband response with center frequencies of 5.2 and 5.8 GHz provide band-to-band isolation better than 30 dB. Measured insertion losses are lower than 2.76 dB, with 3 dB bandwidth lower than 5%. 相似文献
7.
Ho-Gyeong Yun Kwang-Seong Choi Yong-Hwan Kwon Joong-Seon Choe Jong-Tae Moon 《Advanced Packaging, IEEE Transactions on》2008,31(2):351-356
We have developed 40-Gb/s traveling-wave electroabsorption-modulator-integrated distributed feedback laser (TW-EML) modules using several advanced technologies. First, we have adopted a selective area growth (SAG) method in the fabrication of the 40-Gb/s EML device to provide active layers for the laser and the electroabsorption modulators (EAMs) simultaneously. The fabricated device shows that the measured 3-dB bandwidth of electrical-to-optical (E/O) response reaches about 45 GHz and the return loss (S11) is kept below -10 dB up to 50 GHz. For the module design of the device, we mainly considered electrical and optical factors. The measured S11 of the fabricated 40 Gb/s TW-EML module is below -10 dB up to about 30 GHz and the 3-dB bandwidth of the E/O response reaches over 35 GHz. We also have developed two types of coplanar waveguide (CPW) for the application of the driver amplifier integrated 40 Gb/s TW-EML module, which is a system-on-package (SoP) composed of an EML device and a driver amplifier device in a module. The measured S11 of the two-step-bent CPW is below -10 dB up to 35 GHz and the measured S11 of the parallel type CPW is below -10 dB up to 39 GHz. 相似文献
8.
Variable bandwidth filters have been fabricated using silica-based N×N arrayed-waveguide gratings. The centre wavelengths are λ0=1.55 μm for all channels. The 3 dB bandwidths are 40, 78, 116 and 154 GHz, for the filter with a path length difference ΔL=63 μm. In the filter with ΔL=8.6 μm, the 3 dB bandwidths are 414, 769, 1198 and 1608 GHz. The on-chip losses are 2.1-2.9 dB and sidemode suppression ratios are larger than 27 dB 相似文献
9.
A new compact LTCC bandpass filter using negative coupling 总被引:1,自引:0,他引:1
Wei-Shin Tung Yi-Chyun Chiang Jui-Ching Cheng 《Microwave and Wireless Components Letters, IEEE》2005,15(10):641-643
This letter presents the design and realization of a new compact bandpass filter (BPF) fabricated on multilayered ceramic substrates. This BPF features coupled resonators with negative coupling coefficients. A BPF with center frequency 2.45 GHz is designed and fabricated. Its size is only 2.0 mm/spl times/1.8 mm/spl times/0.67 mm when implemented by a standard low temperature co-fired ceramic technology. The size reduction is due to the higher coupling coefficient between the negatively-coupled resonators than the positively-coupled ones, allowing tighter space between the resonators. The measured insertion losses of the previous BPF were less than 3dB and return losses more than 18dB in the passband. The measured result agrees very well with the electromagnetic (EM) designed response. 相似文献
10.
This study presents the implementation of a millimetre-wave bandpass filter with conventional MMIC technology. The filter utilises the inductive /spl pi/-network coupling structure to minimise the effect of process variation and achieve the desired circuit characteristics. The filter is very compact in size and can be precisely predicted by a commercial EM simulation tool. A 26 GHz filter prototype is designed and fabricated. The measured passband insertion loss is about 5 dB and the attenuations at the stop bands are all greater than 20 dB. 相似文献
11.
《Microwave Theory and Techniques》1977,25(8):683-687
A periodic branching filter consisting of three directional couplers, a traveling-wave resonator, and connecting waveguides is used as a band diplexer with a broad 3-dB bandwidth and sharp selectivity for a satellite communication system application. This paper describes a theoretical analysis, a design method, and experimental results for this periodic branching filter. The fabricated periodic branching filter for separating the 30-GHz frequency band 27.0-29.2 GHz into two subbands of equal 3-dB bandwidth of about 900 MHz has sharp frequency selectivity. Measured branching losses and relative delay time are 0.35-0.5 dB and 0.4 ns, respectively, within each frequency subband (f /sub 1,2/ /spl plusmn/ 300 MHz). The 96-g diplexer is made of thin-walled aluminum. Its size is 15 x 9 x 4 cm. 相似文献
12.
A dual-band bandpass filter is presented. The filter is composed of generalized negative-refractive-index transmission-lines (NRI-TL) realized in microstrip. The filtering mechanism relies on all four of the generalized NRI-TLs' left-handed and right-handed passbands. Under the closed stopband condition, two passbands are achieved. A complete design procedure is described. A fabricated example measures 0.25lambdao0.25lambdao, where omegao is the wavelength of the center frequency of the stopband. Maximum insertion loss in the passbands (centered around 4 GHz) is measured at 1.5 dB. 相似文献
13.
Eight-channel flat spectral response arrayed-waveguide multiplexer with asymmetrical Mach-Zehnder filters 总被引:1,自引:0,他引:1
K. Okamoto K. Takiguchi Y. Ohmori 《Photonics Technology Letters, IEEE》1996,8(3):373-374
An eight-channel flat spectral response arrayed-waveguide grating (AWG) multiplexer with asymmetrical Mach-Zehnder filters has been fabricated on the planar lightwave circuit (PLC). The monotonic spectral loss characteristics of AWG have been canceled by the opposite spectral response in the asymmetric MZ filter. The 1.5 dB bandwidth of 141 GHz and 3 dB bandwidth of 159 GHz are obtained for the 200 GHz channel spacing. The 1.5 dB bandwidth becomes 1.8 times wider than that of the conventional AWG. Crosstalks to neighboring and all other channels are less than -24 dB and the on-chip insertion losses range from 7.0 to 7.4 dB, respectively. 相似文献
14.
《Microwave and Wireless Components Letters, IEEE》2008,18(9):587-589
15.
Utility of Schottky diodes fabricated in foundry digital 130-nm CMOS technology is demonstrated by implementing an ultra-wideband (UWB) amplitude modulation detector consisting of a low-noise amplifier (LNA), a Schottky diode rectifier, and a low-pass filter. The input and output matching of the detector is better than -10 dB from 0-10.3 GHz and 0-1.7 GHz, respectively, and almost covers the entire UWB frequency band (3.1-10.6 GHz). The measured peak conversion gain is -2.2dB. The sensitivity over the band for amplitude modulation with the minimum E b/No of 6 dB is between -53 and -56 dBm. The power consumption is only 8.5 mW 相似文献
16.
基于无线局域网(WLAN)的应用背景,设计并加工了一款用于WLAN的双频滤波器。滤波器的主体部分采用两阶的阶跃阻抗滤波器(SIR),馈电方式采用0o平行耦合线馈电方式。测试结果跟仿真结果有很好的一致性,滤波器在两谐振频点2.4 GHz和5.2 GHz处的插入损耗为0.85 dB和1.3 dB。在上述平面滤波器的基础上,进一步分析了圆柱共形对SIR结构谐振特性的影响,利用共形器件的仿真与实际加工装配相一致的准确建模方法,设计了一款圆柱共形双频滤波器,其有更好的赋形性能和选择性。该设计可用于共形通信系统中,具有广阔的应用前景。 相似文献
17.
In this paper, a compact dual-band ultra-wideband (UWB) filter has been newly designed and fabricated for 3.1–4.75 GHz and 6.0–8.5 GHz UWB system applications by embedding all passive lumped elements into low temperature co-fired ceramic (LTCC) substrate. In order to reduce its size/volume and prevent parasitic electromagnetic (EM) coupling between the embedded passive elements, it was newly designed by using a modified 3rd order Chebyshev filter topology and J-inverter transformation technology. Moreover, in order to completely reject the wireless local area network (WLAN) bands of 2.4 GHz and 5.15 GHz, an independent transmission zeros technology was applied. For forming the higher passband, lowpass filters were also applied with two LC resonant circuits by using roll-off characteristics by independent transmission zeros. The measured insertion losses in the lower and upper passbands were better than 2.5 and 2.3 dB, respectively. Return loss and group delay were better than 8 dB and 0.61 ns, respectively in all the passbands. Independent transmission zeros that occurred at 5.17 and 5.42 GHz provided suppression of 22 dB at the WLAN band. The size/volume of the fabricated LTCC dual-band UWB filter was 3.65×2.35×0.65 (H) mm3. 相似文献
18.
《Microwave and Wireless Components Letters, IEEE》2009,19(8):500-502
19.
《Microwave and Wireless Components Letters, IEEE》2008,18(12):806-808
20.
普通的阶梯阻抗低通滤波器滚降系数一般低于80 dB/GHz,阻带抑制小于20 dB,使其应用受到较大限制;文中首先从理论上分析并设计了具有宽阻带优势的阶梯阻抗滤波器,然后引入扇形短截线结构提高滚降系数,设计了一款通带为0~6 GHz 的高滚降宽阻带的微带低通滤波器。利用ADS 和HFSS分别对滤波器进行了建模、仿真和优化;最后采用RO4003 板材加工并对实物进行了测试。测试结果显示,所设计的滤波器3 dB 截止频率为6.02 GHz,滚降系数为123 dB/ GHz,阻带6.24~20 GHz,阻带抑制大于30 dB。 相似文献