共查询到20条相似文献,搜索用时 0 毫秒
1.
A new impedance-transforming dual-band balun with filtering response and favorable output isolations
A new planar dual-band balun with filtering response and output isolations is proposed in this letter. The balun is constructed on a three-layer PCB, whose out-of-phase operation is realized by antisymmetric output configuration. By introducing dual-band resonators and admittance inverters, the circuit is able to operate with designated filtering response, and the source/load impedances could be different. Additionally, the output isolation is reserved by employing two isolation resistors. The experimental results prove that this new balun is a good candidate for multi-standard and multi-functional communications. 相似文献
2.
3.
4.
In this paper, the design of a planar ultra-broadband sum-and-difference network is presented. This network employs a novel power divider and anti-phase balun as a building block. An equivalent 180° coupler with a bandwidth of 6.2 - 14GHz is achieved by back-connecting the power divider and balun together. Four such couplers are connected to form an ultra-broadband sum-and-difference network which has a bandwidth of 91%. This network, with insertion loss less than 1.8dB in sum port and nulls less than -20dB in all delta ports, is verified to be excellent, resulting in the advantages of being compact, easy manufacturing and low cost. 相似文献
5.
在本文中,将微波功率分配器看做用多个两端口网络构成的多端口匹配网络,用集总与分布参数元件混合组成的模块来综合这种网络,从而得到了一种新型的混合集中分布参数微波功率分配器及其机助设计方法。 相似文献
6.
伪波束法研究超宽带室内信道的功率分布 总被引:1,自引:0,他引:1
针对超宽带(UWB)信号的传输特点,以及超宽带信道与窄带信道间的区别,基于传播环境的几何描述,使用伪波束法建立了UWB多径信道有约束的布朗桥模型(BBBM)。根据UWB室内多径信道接收功率的遍历性假设,利用得到的多径信道模型计算室内UWB通信系统的功率分布。对三个典型环境下不同路径的UWB室内信号功率分布进行了仿真分析,计算结果与理论分析一致,表明基于伪波束法的UWB室内信道BBBM模型是正确的,使用BBBM模型可以分析UWB通信系统在室内环境的功率覆盖。 相似文献
7.
8.
9.
An effective design procedure based on method of least squares is proposed for multi-section and multi-output fork power divider/combiner with arbitrary power division ratios among its outputs in a specified frequency bandwidth together with impedance matching among its arbitrary source/load impedances. Transmission and scattering matrices are obtained for its equivalent circuit. An error function is constructed based on design specifications on its output power division ratios, isolations among output ports, return losses at its input and output ports and source/load impedances in a desired frequency bandwidth. The design procedure is fully developed, which determines the widths and lengths of microstrip line sections and resistor values. A design example is described for unequal power division ratio and unequal input/output impedances. A 3-section and 3-output fork power divider is designed for equal power division and load/source impedances for 2–12 GHz band. It is fabricated and measured. Variations of its transmission coefficients are less than 0.5 dB, isolations at its outputs are better than −15 dB and reflection coefficients at its ports are better than −10 dB. Excellent agreement is observed among the results of the proposed design procedure, full wave computer software and measurement data. 相似文献
10.
11.
《AEUE-International Journal of Electronics and Communications》2014,68(12):1234-1238
A millimeter-wave waveguide-based out-of-phase power divider/combiner using microstrip patch antenna has been proposed in this paper. The stepped rectangular waveguide provides smooth impedance matching from standard rectangular waveguide to oversized rectangular waveguide. In order to obtain good amplitude balance, four symmetrical microstrip patch antennas are utilized. A Ka-band four-way passive power combiner is designed and measured. The measured results show a reasonable agreement with the simulated ones. 相似文献
12.
13.
The theory and design aspects of n-way in-phase power divider employing Goldfarb recombinant topology are described. The merits of this divider over conventional ones are also presented here. A microstrip version of five output port power divider is designed and developed with 1.7?mm Bakelite substrate to operate in S-band. The measured values of input VSWR, insertion loss, isolation, return loss and phase difference between output ports at different frequencies in S-band for the fabricated power divider are presented and discussed. 相似文献
14.
在1034探针台中,驱动承片台在X-Y方向运动的平面电机功率放大部件是该设备的核心部件,其性能的好坏直接关系到探针台的性能。本文拟从简述平面电机的原理入手,对该功放部件的性能、测试方法和维修作一讨论。 相似文献
15.
该文提出一种基于谐振器慢波传输线的小型化宽阻带谐波抑制功分器,该谐振器慢波传输线由矩形谐振器、T型谐振器和蛇形线构成,来取代功分器中的1/4波长传统微带传输线。所设计制作的功分器,其尺寸仅为传统微带功分器的37.4%。实验结果表明,该功分器回波损耗大于10 dB的带宽范围为0.1~1.19 GHz,在2.2~11.05 GHz频率范围内衰减大于20 dB,具有较宽的阻带从而具有抑制谐波效果。仿真和测试结果较为吻合,验证了所提设计方法的有效性。 相似文献
16.
This work presents a compact Balun with enhanced bandwidth and better isolation between output ports using Interdigital Capacitor (IDC). Firstly, a Rat Race Coupler (RRC) is designed, later Balun is proposed by replacing the isolation port with a 50 Ω isolation resistor. The proposed Transmission line (TL) is designed using an IDC in parallel with a high impedance TL. Based on a π-equivalent circuit the proposed TL has been investigated and optimized to achieve 70.7 Ω impedance. The Balun is designed and fabricated. The simulated and fabricated results are in accord. The fractional bandwidth (FBW) of RRC and Balun are 37.5% and 33% respectively at centre frequency 2.4 GHz. The size occupied by the proposed Balun is 0.51λg × 0.22λg. The structure is low cost, uniplanar and compact. 相似文献
17.
19.
20.
对超宽带(UWB)技术的起源和在现阶段的发展概况进行了阐述,讨论了DS-CDMA实现方式的技术特点,通过对技术参数的分析,说明了DS-UWB技术的利弊所在,同时介绍了DS-UWB当前的应用情况和发展前景。 相似文献