Showing papers on "Insertion loss published in 1972"
TL;DR: In this article, an asymmetric dielectric light guide with a metal-film outer coating was used to select TE0 mode selection in an Asymmetric Dielectric Light Guide.
Abstract: TE0 mode selection was observed in an asymmetric dielectric light guide with a metal‐film outer coating. TM0 mode and higher‐order modes could not transmit through the guide, whereas the loss of the TE mode, the insertion loss, was small. The experimental data were in good agreement with the theoretical results given here. Filter action is explained by modal repulsion from the metal wall that is inherent in an asymmetric guide.
117 citations
68 citations
31 citations
30 citations
TL;DR: In this paper, the authors considered a uniform transmission line of impedance Z/sub I/ and length equal to a quarter wavelength at the load resonant frequency, and showed that either maximally flat or ripple insertion loss frequency response can be obtained by proper choice of Z/Sub I/, and the 3dB bandwidth obtained in either case is always greater than 1/Q.
Abstract: Broad-band coupling between a resistive source and a resonant load is considered for coupling networks consisting of a uniform transmission line of impedance Z/sub I/ and length equal to a quarter wavelength at the load resonant frequency. An approximate analysis is used to show that either maximally flat or ripple insertion loss frequency response can be obtained by proper choice of Z/sub I/, and the 3-dB bandwidth obtained in either case is always greater than 1/Q. Depending on the ratio of load and source resistances, the bandwidth may be greater than 1 octave. Network design curves for maximally flat operation with a variety of load parameters are computed without approximation. The design of lumped element approximations for the transmission line network is also described.
21 citations
TL;DR: In this article, a subsidiary-resonance limiter with a dynamic range of greater than 200 kW is described, which consists of a multilayer ferrite-dielectric "sandwich" placed on the narrow wall of a reduced-height reduced-width rectangular waveguide.
Abstract: A compact subsidiary-resonance limiter with a dynamic range of greater than 200 kW is described. The structure consists of a multilayer ferrite-dielectric "sandwich" placed on the narrow wall of a reduced-height reduced-width rectangular waveguide. Below-the-threshold insertion loss is less than 0.5 dB over the 5.4-5.9-GHz band, and the threshold level is about 20 W.
10 citations
TL;DR: In this paper, a waveguide method is described for improving the precision and accuracy of reflectivity loss measurements of perforated-plate mesh materials, achieving accuracies of the order of ± 0.005 dB.
Abstract: A waveguide method is described for improving the precision and accuracy of reflectivity loss measurements of perforated-plate mesh materials. Overall accuracies of the order of ±0.005 dB can be achieved through the use of a dual-channel tuned reflectometer system and high-precision insertion loss test set.
8 citations
01 Jan 1972
7 citations
01 Apr 1972
TL;DR: In this paper, the authors extended the theory of evanescent mode filters to include susceptance loading midway between cavities and showed that inductive loading can provide a substantial reduction in the length of narrowband filters without significantly increasing the insertion loss.
Abstract: The paper extends the theory of evanescent-mode filters to include susceptance loading midway between cavities. It is shown that inductive loading may be employed to provide a substantial reduction in the length of narrowband filters without significantly increasing the insertion loss. By replacing conventional capacitive-tuning screws with quartz-rod tuning elements, losses comparable with conventional waveguide filters are obtained in filters requiring about half the volume.
6 citations
TL;DR: In this article, a technique for controlling the insertion loss of a surface-wave acoustic transducer as a function of frequency, which avoids apodisation and its associated problems, is described.
Abstract: A technique for controlling the insertion loss of a surface-wave acoustic transducer as a function of frequency, which avoids apodisation and its associated problems, is described. As an example of its implementation, a flat bandpass filter of constant aperture is described.
6 citations
Patent•
12 May 1972
TL;DR: In this paper, the authors proposed a precision distributed parameter delay line for use in high speed circuitry requiring very precise nanosecond delay intervals, in which a central conductor and a coaxially aligned conductive sheath with the sheath preferably being insulated over its length.
Abstract: A precision distributed parameter delay line for use in high speed circuitry requiring very precise nanosecond delay intervals. The delay line, in one preferred embodiment, comprises a section of coaxial cable transmission line having a central conductor and a coaxially aligned conductive sheath with the sheath preferably being insulated over its length. The section of coaxial cable tranmission line functions as a low impedance delay element of extremely small outer diameter whose length may be adjusted to provide delays of from tenths to hundreds of nanoseconds. The nature and size of the delay line is such as to make it extremely adaptable to being coiled so as to significantly reduce the amount of space which it occupies. A very short section of coaxial cable transmission line of similar design and impedance characteristics is coupled to the input and/or output ends of the coaxial cable transmission line section central conductor to improve the rise time and provide an extremely high delay to rise time ratio, low insertion loss, low characteristic impedance and is adaptable for use over a wide frequency bandwidth. The delay line may also take the form of a printed circuit of the microstrip type transmission line comprised of an elongated, preferably undulating conductive strip separated from a conductive ground plane by a suitable dielectric with input and output terminals being located a spaced distance from the extremities of the undulating conductive member to provide the characteristics set forth hereinabove while taking advantage of microconductor techniques to further reduce the size and allow dual-in-line delay line packages. Both of the above embodiments may be modified accordingly to provide a tapped delay line having the desirable characteristics set forth herein.
TL;DR: A recently developed phased-array feed configuration offering significant advantages over the conventional space, corporate, and series feed techniques is described in this article, referred to as the "flat feed," allowing power division for monopulse sum and difference pattern illumination functions in a feed depth of less than a half-wavelength with low loss.
Abstract: A recently developed phased-array feed configuration offering significant advantages over the conventional space, corporate, and series feed techniques is described This technique, referred to as the "flat feed," allows power division for monopulse sum and difference pattern illumination functions in a feed depth of less than a half-wavelength with low loss The technique used to extract energy from the power divider, which consists in part of a radial transmission line, results, in its simplest configuration, in a circular grid of antenna elements Relations governing the circular grid array geometry design are derived which relate the angular locations of attenuated grating lobes to the spacing between the rings of radiating elements Experimental S -band hardware, built to prove the feed technique, is described It includes a multimode launcher with measured coupling between circular wavegulde sum ( TM_{01} ) and difference ( TE_{11} ) modes of less than -37 dB; a seven-ring 1:195 radial power divider measured across a 10-percent band to have insertion loss of 01 dB and rms phase and amplitude deviations of less than 35\deg and 047 dB; a 144-element array whose measured sum and difference beam radiation patterns are compared with calculated patterns for scan angles out to 60\deg and whose sum port VSWR, measured across a 10-percent band, was under 18:1 with the array steered to broadside, and under 15:1 for other scan angles out to 60\deg
TL;DR: In this paper, a least square fitting of transmission versus frequency data has been used to determine Q and resonant frequency f/sub r/ with computer-controlled equipment in an iterative process.
Abstract: The Q's of a waveguide transmission cavity with and without insertion of a length of waveguide give the insertion loss. Least-squares fitting of transmission versus frequency data have been used to determine Q and resonant frequency f/sub r/ with computer-controlled equipment in an iterative process. Preliminary values of Q and f/sub r/ are used to calculate an improved set of test frequencies, and so on. A rapid least-squares method is described which minimizes truncation errors.
TL;DR: In this paper, a delay line with an insertion loss of 26 dB at 77 K was constructed on strontium titanate and the temperature and electric field dependence of the insertion loss were given.
Abstract: Surface acoustic waves have been generated and detected on a biased electrostrictive substrate. A delay line with an insertion loss of 26 dB at 77 K has been constructed on strontium titanate. The temperature and electric-field dependence of the insertion loss are given.
TL;DR: In this paper, the authors compared the performance of two types of transducers: grating array transducers and interdigital transducers at 2.55 GHz on a LiNbO3 substrate and found that the insertion loss of a 1.5 s delay line is equal to 39 dB with matching stubs at input and output.
Abstract: Grating-array transducers are used to launch acoustic surface waves at 2.55 GHz on a LiNbO3 substrate. The insertion loss of a 1.5 ?s delay line is equal to 39 dB with matching stubs at input and output. The 3 dB bandwidth is equal to 87 MHz. For this frequency range, array transducers are easier to fabricate than standard interdigital transducers. Performances of the two types of transducers are compared.
TL;DR: In this article, a CdS tlun film transducer was characterized by the voltage step response technique and also by the insertion loss method, yielding values for the coupling coefficient that agree to within experi- mental error.
Abstract: A method is presented for characterizing piezoelec. tric transducers by their response to a voltage step. The ob- served output signal is compared with the response derived from a computer analysis of the theoretical transfer function. Fast Fourier transform techniques are utilized in the analysis because of the great saving in computation time afforded. Data accumulation is much more rapid in this procedure than in the insertion loss method. A CdS tlun film transducer evaporated onto an X-cut quartz rod is characterized by the voltage step response technique and also by the insertion loss method. The two approaches yield values for the coupling coefficient that agree to within experi- mental error.
TL;DR: In this paper, a 22 μs acoustic delay line has been produced on spinel with a center frequency of 2900 MHz, a bandwidth of 200 MHz and a total insertion loss of 44 dB.
Abstract: A 22 μs acoustic delay line has been produced on spinel with a centre frequency of 2900 MHz, a bandwidth of 200 MHz and a total insertion loss of 44 dB.
TL;DR: In this paper, a 4-level phase switch with two switching diodes and one circulator is investigated and compared to a switch using two circulators, and the loss of this circuit is given as a function of diode Q
Abstract: A 4-level phase switch using two switching diodes and one circulator is investigated and compared to a switch using two circulators. The results are as follows. 1) If one uses a Iossless combining network for the two diodes, it is impossible to make the losses equal in all four switching states. 2) One can balance the losses by introducing a lossy element into the circuit. The loss of this circuit is given as a function of diode Q
01 May 1972
TL;DR: In this paper, a 1µm vacuum-deposited recrystallized thin film of InSb was placed in K-band waveguide with the plane of the film parallel to the electric field and with an external magnetic field applied normal to the film (the field displacement mode).
Abstract: Room temperature measurements were taken at 23.9 GHz on an isolator fabricated by placing a 1-µm vacuum-deposited recrystallized thin film of InSb in K-band waveguide with the plane of the film parallel to the electric field and with an external magnetic field applied normal to the film (the field displacement mode). The best case gave an insertion loss of 7.4 dB, nonreciprocity of 13 dB, and isolation of 20.5 dB in an external magnetic field of 20 kOe.
TL;DR: In this paper, a trigonally symmetric magnetic system was proposed to enhance both the isolation and the operational bandwidth of a C-band circulator with a relative bandwidth of 27 percent while holding the insertion loss at less than 0.5 dB.
Abstract: A distinct enhancement of the traditional circulator in both the isolation and operational bandwidths has been found to be realized by means of a trigonally symmetric magnetic system. Experiments utilizing the field probing scheme which the present author published previously have verified that the proposed magnet system significantly contributes to the simultaneous enhancement of both the bandwidth and the isolation, in that field concentration favoring isolation enhancement is realized, and that tapered field matching is established. The proposed new magnet system has enabled a compact C-band circulator to be implemented with isolation as high as 30 dB or more for a relative bandwidth of 27 percent while holding the insertion loss at less than 0.5 dB.
TL;DR: In this article, a system is described that characterizes two-port RF networks from 0.4-500 MHz with characteristic insertion loss, characteristic phase, and return loss, as well as group delay.
Abstract: A system is described that characterizes two-port RF networks from 0.4-500 MHz. Parameters measured are characteristic insertion loss, characteristic phase, and return loss, as well as group delay. Emphasis is placed on dynamic range specifications and the choices made in arriving at them. The factors controlling dynamic range are considered in detail with particular regard to those decisions that were made before hardware design began. An example is given demonstrating 115-dB range from maximum drive level to all noise and crosstalk.
TL;DR: In this paper, two methods for testing short lengths of multimodal circular waveguides, working in the TE/sub 01/mode accompanied by many spurious modes, are described.
Abstract: Two methods for testing short lengths of multimodal circular waveguides, working in the TE/sub 01/ mode accompanied by many spurious modes are described. One method is based on the measurement of the return loss of a resonant one-port cavity; the second one measures the insertion loss of a cavity coupled to the rectangular main waveguide. Automatic data selection and manipulation are emphasized.
TL;DR: In this article, a 6 GHz improved rotating field phaser, which consists of a circular waveguide loaded with a ferrite tube containing a metal rod coaxially, is described.
Abstract: A 6 GHz improved rotating field phaser, which consists of a circular waveguide loaded with a ferrite tube containing a metal rod coaxially, is described. In order to design the phaser, the differential phase shifts of the phaser have been calculated by a perturbation method under some assumptions, resulting in good approximate values. The phaser constructed for trial is shown to have an insertion loss of less than 0.6 decibels over an 8 percent frequency band.
TL;DR: In this article, the transducers of an a.s.w. structure can be visualised as electrical transmission lines and that this approach can lead to design simplification and improved performance.
Abstract: This letter shows that the transducers of an a.s.w. structure can be visualised as electrical transmission lines and that this approach can lead to design simplification and improved performance. Simple modification of the transducers makes the input impedance purely resistive. Computed and experimental results for quartz and lithium-niobate substrates show that the technique can provide a reduced insertion loss for dispersive structures.
22 May 1972
TL;DR: In this article, a microstrip-type SPDT switch, using only two PIN diodes and eliminating usual dc blocking capacitors, has demonstrated an RF power handling capacity greater than 100 W CW at S-band.
Abstract: A microstrip-type SPDT switch, using only two PIN diodes and eliminating usual dc blocking capacitors, has demonstrated an RF power handling capacity greater than 100 W CW at S-band. The insertion loss is less than 0.25 dB and the input-to-off port isolation is greater than 36 dB over a bandwidth larger than 30 MHz.
22 May 1972
TL;DR: In this paper, a PIN-based digital phase shifter utilizing three PIN diodes in a tee configuration is described and the operation is explained in terms of low and high pass filter characteristics.
Abstract: A digital phase shifter utilizing three PIN diodes in a tee configuration is described. The operation is explained in terms of low and high pass filter characteristics. Design expressions for phase change, insertion loss and VSWR as a function of element values are given. Frequency characteristics for 45, 90 and 180 degree units are shown in graphical form.
TL;DR: In this paper, a stripline-type ferrite tuner with polycrystalline CaV garnet at UHF band was proposed, which achieved an effective line width as a function of both frequency and t/D over the band 100-4000 MHz.
Abstract: We made a stripline-type ferrite tuner with polycrystalline CaV garnet at UHF band The properties of the ferrite disk were first evaluated in a bandstop filter configuration The effective line width was measured as a function of both frequency and t/D over the band 100-4000 MHz, and we discussed the necessary conditions for making a narrow filter with small insertion loss at low frequency The coupling theory of the ferrite tuner together with the theoretical equation of the external Q are presented The experimental values of the external Q almost coincides with the theoretical ones Tests of this tuner resulted in an insertion loss is 19-25 dB, a bandwidth of 20-30 MHz, and an attenuation at the image frequency of more than 30 dB The performance of higher modes is also discussed
TL;DR: In this paper, the top-wall and multiple-branch waveguide couplers were developed as hybrid junctions for millimeter wavelengths, and their electrical characteristics were measured.
Abstract: Top-wall and multiple-branch waveguide couplers were developed as hybrid junctions for millimeter wavelengths, and their electrical characteristics were measured. For construction of the 55-GHz top-wall coupler, electroforming techniques were used; for the 94-GHz branch-guide coupler, the branch lines were cut directly into the wall of the main guide. Copper losses were less than 0.2 dB for the two types of couplers.
TL;DR: In this article, the insertion loss due to the anisotropy field has been proved to be eliminated, and the value of the spin-wave linewidth has suggested that high power capability is enhanced.
Abstract: One of the authors has demonstrated that the high-power capability of a latching phase shifter was remarkably enhanced by employing Co2+doped Gd YIG without any increase in the insertion loss. Investigations done so far on the insertion loss are not sufficient to describe this fact. A part of the results of the investigation concerning Co2+doped Gd YIG has been presented by Nicolas et al. The characteristics of the Co2+, doped Gd YIG have been studied in regard to a latching phase shifter by way of the precise measurement of the complex permeabilities. For the samples containing an appropriate amount of Co2+, the part of the insertion loss due to the anisotropy field has been proved to be eliminated, and the value of the spin-wave linewidth has suggested that high-power capability is enhanced. The coercive force indicates the minimum value at that content of Co2+, while the remanence ratio remains fairly constant. It is concluded that the materials containing an appropriate amount of Co2+are superior to those materials without Co2+in both the insertion loss and high-power capability.
TL;DR: In this article, a technique for evaluating delay lines with an automatic network analyzer is described. Extremely precise values of the delay can be obtained by an iterative process which uses final measurement frequencies spaced by integral multiples of the reciprocal delay.
Abstract: Techniques for evaluating delay lines with an automatic network analyzer are described. Extremely precise values of the delay can be obtained by an iterative process which uses final measurement frequencies spaced by integral multiples of the reciprocal delay. The magnitude of leakage and triple-delayed transmissions are determined from measurements which are also necessary to obtain accurate values of insertion loss.