Triplate Line Research Articles

Ink-jet printing of dual polarized loop slot antenna fed by tri-plate line on paper based substrates

Ink-jet printing of dual polarized loop slot antenna fed by tri-plate line on paper based substrates

The improvement of tri-plate line performance by using corrugated transitions

A novel structure is investigated for the improvement of tri-plate line (TPL) performance. Based on experience in the design of horn antennas, we introduce corrugations of the transition section of the TPL in order to achieve better field uniformity and to reduce the return loss. A corrugated transition waveguide may be viewed as the cascade of bifurcated metal waveguides. We employed the building-block approach, which breaks the overall structure into cascaded subcells, each of which may be analyzed rigorously by the mode-matching method. Thus, the input-output relation of each subcell is obtained as well as that of the overall structure. This enables us to carry out a parametric study on the field distribution inside the TPL test fixture, so that we can optimize its design for any required specifications.

Parallel‐plate mode suppression in a slot‐coupled microstrip antenna with a triplate line feed

Parallel‐plate mode suppression in a slot‐coupled microstrip antenna with a triplate line feed

Parallel-plate mode suppression in a slot-coupled microstrip antenna with a triplate line feed

Experimental and numerical considerations on parallel-plate mode suppression have been performed on a slot-coupled microstrip antenna with a triplate line feed. In the measurements, the effect of multiple reflection of the parallel-plate mode is caused by the edge of the dielectric substrate. We have proposed a technique to solve the problems concerning multiple reflection, and obtained good agreement between measurements and calculations. Measured results demonstrate the effective performance of the configuration with a shunt-stub in the isolated geometries. We have also performed considerations numerically on mutual coupling due to the parallel-plate mode in the array configuration with two elements. Numerical results indicate drastic suppression of the mutual coupling due to the parallel-mode in comparison with the conventional configuration.

Slot-coupled microstrip antenna with a triplateline feed where parallel-plate mode is suppressed

In a slot-coupled microstrip antenna with a triplate line feed, the parallel-plate mode is excited by the slot, resulting in a decrease of radiation efficiency. The authors present a technique for suppressing the parallel-plate mode in this type of the antenna. Measured results confirm the effective performance of the proposed method.

Novel slow-wave meander lines using multilayer MMIC technologies

Slow-wave lines in a meander configuration, fabricated with multilayer MMIC technologies, are proposed, and their performance is investigated experimentally. Multilayer construction of capacitive triplate lines allows reduction of the chip area of periodic slow-wave line circuits. With this design, less than one half of the area of conventional straight slow-wave lines is required. Additionally, it permits higher frequency operation up to 40 GHz with a negligible dispersion. >

Dual-loop slot antenna with simple feed

A dual-loop slot antenna consisting of two identical loops fed by a triplate line is proposed. It is experimentally demonstrated that the antenna radiates a unidirectional beam of linear polarisation. It is also shown that the generation of a circularly polarised wave is possible by adding perturbation elements to the loops.

Low-noise photoparametric up-converter

An analysis is given for a photoparametric up-converter system. The up-converter consists of a single triplate line with one coaxial output connected to a circulator, through which the pump is applied and the signal extracted. The other end of the line is connected to the photo diode via a small coupling capacitor. The light is modulated at frequencies from a few hertz to some upper limit determined by the bandwidth of the triplate circuit. This arrangement is shown to give excellent results and the limit performance, as determined only by the diode parameters may be attained by following the up-converter with a degenerate parametric amplifier using the same pump plus a varactor doubler.

Design of Triplate Line Low Pass Filter

ABSTRACTMicrowave filters form an important building block in the design of low noise parametric amplifiers, harmonic generators and various other microwave circuits. Conventional mode of transmission at microwave frequency is by waveguides and coaxial lines, which have certain disadvantages. The triplate line for transmission of microwave frequencies is a recent advance and offers a number of advantages, such as ease of manufacture and high order of reproducibility.The paper gives the design aspects of a constant K five-section low pass filter with m derived end sections, designed for specific application in the Land S-bands. The realization of the designed inductive and capacitive elements in triplate line is discussed. The experimental results on a triplate line filter in L-band and one in the S-band are presented with the corresponding theoretical designs.

The characteristic impedance and phase velocity of high-Q triplate line

The derivation of the impedance and phase velocity for high-Q triplate line is considered. An exact solution is obtained for the impedance in the absence of the dielectric support sheet. The effect of the sheet is then considered as a perturbation, the analysis resulting in an expression for the phase velocity of the waves in the line. This is compared with experimental values and it is shown that the agreement is sufficiently close for design purposes.

Re-entrant transmission-line filter using printed conductors

The re-entrant line filter section first described by Alford in 1939 is employed. The theory of these filters is expanded, and a novel procedure is described for the design of microwave low-pass filters possessing a relatively high stop-band insertion loss over bandwidths of 3 : 1 or more. The filter may conveniently be realized in strip-transmission-line form utilizing printed-circuit techniques. In this form it appears to possess certain advantages over strip-line filters of more conventional design, notably the large operating bandwidth, and the accuracy with which the cut-off frequency can be computed. A variety of these filters have been constructed both in microstrip and triplate line, the latter form being more suitable for packaged units. A very high degree of electrical reproducibility comparable with the best waveguide practice has been observed, with the advantage of reduced manufacturing costs.

Photoetched Microwave Transmission Lines

Microwave transmission line and components of unusual light weight and compact construction can be made employing photoetching techniques to produce strip type transmission line. This report will be a general description of work done at Sanders Associates, Inc., to develop techniques for the design and manufacture of photoetched microwave transmission lines. Discussion will include measurements of attenuation and radiation leakage on parallel plate strip lines, as well as shielded type Tri-plate lines, the problem of mode purity and its relation to electrical parameters, various schemes of making transitions from standard waveguide to photoetched strip line. The basic design and performance of various components, as well as items of test equipment, such as slotted lines, matched loads, fixed attenuators, variable attenuators, directional couplers, crystal holders, phase shifters, hybrid rings, coax to Tri-plate transistors, etc., will also be treated. In addition, data will be presented showing impedance and susceptance values of simple discontinuities and impedance matching transformers. A simple technique for constructing gyrators and resonators will be presented, and the design and fabrication of an S-band signal generator employing photoetched microwave Tri-plate line will be shown, illustrating that practical microwave systems can be constructed far more economically than would be possible utilizing conventional waveguide techniques.