N-way hybrid combiner

A 2N port hybrid network is described in which connections between ports are made by ?-wave or ?-wave transmission lines. It is suitable for combining N coherent signal sources.     

Quasi-optical power combiner

Two novel and compact Q.O.P. combiners of (S.S.S.) in M.M.W band is described. This paper explains with emphasis the principle and the fabrication of the combiner.     

Modelling a millimeter wave harmonic power combiner by a hybrid field analysis technique

A dual-diode millimeter wave harmonic power combiner in which two radial line transformers are used is modelled by a field analysis technique based on Galerkin's method combined with collocation technique. The external circuit impedances looking outside from each of two active devices are computed at both fundamental frequencies and the second harmonic frequencies. Numerical results of the impedances with respect to various structural parameters are presented. Some important characteristics of the harmonic power combiner are revealed. A number of useful conclusions have been deduced for practical design and adjustment.     

A proposed multistage microwave power combiner

A method is proposed by which an arbitrary number of microwave powers can be combined to obtain a high power from solid-state devices. Oscillators are coupled in cascade by the use of directional couplers incurring no power loss in principle.     

LINC power amplifier combiner method efficiency optimization

Linear amplification using nonlinear components (LINC) is a method of vector summing two constant amplitude phase-modulated signals to achieve power amplification. The theoretical efficiency of the LINC power amplifier has been reported as 100% since highly efficient nonlinear constant amplitude amplifiers can be used. However, the 100% efficiency performance is only possible at one or two loads along the power output curve. The bulk of the papers regarding LINC has focused on clever implementations of the signal vector decomposition as well as methods to achieve highly linear signal separation. There has been little regard in the literature to the signal combiner implementation necessary to achieve the high power-added efficiency (PAE) of the LINC radio frequency (RF) power amplifier. Efficiency is not an intrinsic property of the combiner implementations, however, the combiner method is the single biggest contributor to efficient performance of a LINC RF power amplifier. This paper develops an analysis method that determines the efficiency of the LINC power amplifier as a function of the amplitude modulation statistics. This can be employed to design the RF communication system amplitude modulation characteristics and to tradeoff and optimize the RF transmitter PAE     

高功率光纤激光信号耦合器

实验研究了由三根信号光纤锥形束和一根多模光纤组成的3×1信号耦合器.通过仿真,发现锥形长度越长传输效率和输出光束质量越好,同时也验证了对于低阶模场的吸收要高于高阶模场.实验中,制作了锥区长度为10 mm的3×1信号耦合器,在单纤注入信号功率分别为258 W和365 W的情况下获得转换效率为96.6%的信号输出,总输出功率602W,光束质量为Mx2 = 10.5, My2 = 9.7.     

6mm Solid state source power combiner

On 6mm wave band, the properties and structure of a power combiner which consists of two Gunn diodes in rectangle waveguide, the principle and experiments are reported. The theory is suitable for the power combiner operating below long-millimeter-wave region.     

Spatial power divider/combiner in D-band

Five-element spatial power divider/combiners have been realized at 150 GHz. Holography is applied to couple the field pattern of an in-line rectangular horn antenna array to a pseudoplane wave. The hologram is realized as periodic phase grating. The transformation of the pseudoplane wave to a Gaussian beam is performed by phase modulation with a dual-offset reflector on the one hand, and a system of Fresnel lenses on the other hand. Both setups have been extensively examined. The analysis has been enhanced by a vector near-field measurement system. The comparison of the simulated and measured efficiencies, as well as field distributions shows good agreement.     

Broadband folded Wilkinson power combiner/splitter

A new folded Wilkinson power combiner/splitter has been realized at millimeter-wave frequency with an area that is one half that of the standard two-stage Wilkinson power combiner. The new splitter has an insertion loss of 5dB, an isolation of 15dB and a return loss 15dB from 15 to 45GHz.     

A resonant-cap power combiner for two-terminal millimeter-wavedevices

A power combiner for three active two-terminal devices located under a common resonant cap is presented. An equivalent circuit with lumped elements describing the coupling between the devices is derived from a numerical finite-element simulation of the resonator. The applied monolithically integrated mounting technique for the active devices minimizes parasitic elements and gains high reproducibility and symmetry. Experimental results with GaAs IMPATT diodes on diamond heatsink of up to 500 mW at 91 GHz with a dc to RF conversion efficiency of 9.0% and excellent combining efficiency demonstrate the capability for power generation in the mm-wave region     

A novel exponential power combiner/divider

A simple and novel theoretical analysis for an exponential two-way power combiner/divider is developed. The proposed power combiner/divider's parameters, such as input impedance and reflection and transmission coefficients, are determined. The capacitance effect due to the finite thickness of the coupled-line conductor for both uniform and nonuniform transmission lines is found. The properties of the combiner/divider were tested experimentally, and experimental results are presented     

On the extraction of harmonic power from quasi-optical solid-state power combiner

Quasi-Optical solid-state power combiner using high Q open resonator as its resonating system has high stability of frequency and can combine powers from several devices easier than other combiners. In this paper, the technique of harmonic power extraction from quasi-optical open resonator is analyzed and discussed, finally the possibility of this technique is discussed as well.     

Ka-band solid-state pulsed Gunn oscillator and power combiner

GaAs Gunn diodes were fabricated for pulse source application at 8 mm wave band and operated with pulsewidths of 0.05 to 2.0 microseconds and duty cycles of 0.001 to 0.01. Peak pulse output power levels of 0.8–1.2W are achieved and the maximum available power is 1.6W with the highest efficiency of 6.5 percent. A simple and compact pulsed power combiner is also given in this paper.     

A global optimization method for quasi-optics power combiner

This paper describes an algorithm which can determine a neighborhood of the global optimum of an objective function and an estimate of the global optimum. This method wasemployed to determine global optimum of the fundamental mode power, the fractional power of the fundamental mode and the combining efficiency. Given this information, a local optimization procedure can be employed to local the global optimum.     

Circuit analysis of the compound quasi-optical power combiner

In 1991, we developed a new type of quasi-optical power combiner, called a compound quasi-optical power combiner, at Ka-band. In this paper, the circuit of such a compound quasi-optical power combiner is analysed. Its equivalent circuit model is proposed. The circuit equations, the balance condition, the injection locking and the stabilized condition of the compound quasi-optical power combiner are studed by the equivalent circuit model. As an example, a compound quasi-optical power combiner which consists of two single—cavity, two—device power combiners is analysed     

New radial power combiner using tubular dielectric cavities

Initial results obtained with a radial dielectric combiner are described. The circuit uses microstrip lines connected to the active devices and coupled to a tubular dielectric cavity acting as a combiner circuit.     

Travelling-wave power combiner/divider implemented by lumpedelements

A four-way travelling-wave power divider/combiner was designed and implemented by using lumped LC π-networks. For application around the upper VHF and the lower UHF bands, microstrip line is not suitable as the physical quarter-wave length is too long. Therefore, the authors introduce another implementation method using lumped elements     

一种Ka波段基片集成波导功率合成器的设计

笔者设计了一种结构简单,容易制造的基片集成波导功率分配器／合成器,该分配器／合成器采用渐变微带线——波导的过渡结构,并且厚度只有1．254mm。通过HFSS仿真软件,设计了一个中心频率为35GHz的Ka频段的功率分配器。仿真结果显示此种结构具有极低的插入损耗和较低的回波损耗。