The Use of Coaxial and Balanced Transmission Lines in Filters and Wide-Band Transformers for High Radio Frequencies

Mason, W. P.; Sykes, R.A.

doi:10.1002/j.1538-7305.1937.tb00422.x

Cited by 24 publications

(8 citation statements)

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“…Studies on microwave filters started before World War II. The first study was reported in 1937 by W.P Mason and R.A. Sykes [1]. Although the study was conducted almost 85 years ago, the outcomes are still applicable today.…”

Section: Introductionmentioning

confidence: 99%

Coaxial Low-Pass Filter Design and Manufacture

E.Yilmaz

ÜÇÜNCÜ

2023

IEEE Access

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In this study, a low-pass filter with coaxial transmission lines is designed and produced.The objective for designing a coaxial low-pass filter was to utilize both low loss transmission and high breakdown voltage capability for high power microwave applications to enable the suppression of the second harmonic of the 4.4-6 GHz C-Band ( C-Band was selected as a proof of concept ) signals with minimal insertion loss. Microwave and 3D electromagnetic simulators were used in the filter design. The design was started by establishing an 11 th order Chebyshev low-pass filter prototype giving 0.05 dB ripple. Based on this prototype, a filter circuit consisting of capacitors and inductors as lumped elements was designed. The low and high impedances to be selected for the stepped impedance method, which is the basis of the transition to coaxial transmission lines, were decided and the most suitable impedances for manufacturing was determined. The filter using these impedances and designed with stepped impedance lines was transformed into the filter in which coaxial transmission lines are used. Coaxial transmission lines in the low-pass filter circuit consist of conductors with an insulating material in between. While the insulating material is selected as air in the high impedance sections of the transmission lines, it is PTFE (Polytetrafluoroethylene) with an insulating constant of 2.1 in the low impedance sections. The designed filter was manufactured. The basic properties of the manufactured filter were characterized by using RF measuring devices and compared with the designed filter. The measurements results prove that the frequency responses of the designed filter and the produced filter are very close to each other. Namely, a low-pass filter with a cutoff frequency of 6 GHz, a sharp suppression of about 45 dB at the stopband of 9 GHz and a return loss of 20 dB was designed and produced by using coaxial transmission lines. The novelty in our work can be stated that the power handling capability is increased by two techniques. The first one is that the highest transmission line radius preventing the higher order mode excitations is used to decrease the conductor loss. Teflon is covered around the low impedance lines to enhance the dielectric breakdown capability. Teflon inclusion is also used to decrease the practical low impedance level that improves the filter characteristics.

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Section: Introductionmentioning

confidence: 99%

Coaxial Low-Pass Filter Design and Manufacture

E.Yilmaz

ÜÇÜNCÜ

2023

IEEE Access

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“…Then, the military desired this technology to be used in radar, band limiting, multiplexing, and electronic counter measures on their attempt to step up from the analogue lumped filters used at the beginning of WWII. The Radio Research Laboratory did much of the early work on band-pass distributed impedance filter to develop coaxial filters for electronic countermeasure applications [7]. Telecommunication companies and other organizations with large data networks applied the microwave filters to their data broadcasting [8].…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Filters Manufactured Using Hybrid 3d Printing Method

Robles¹,

Bustamante²,

Darshni³

et al. 2019

PIER M

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In this work, two different high-frequency filters were produced, and each was manufactured in two different ways, one using conventional PCB technology and the other using hybrid 3D printing. The hybrid 3D printing technique combined the use of microdispensing of conductive inks and fused filament fabrication (FFF) of thermoplastic substrates. Measurements, properties, and comparisons between these filters are discussed. The goal of the research was to benchmark 3D printing of highfrequency filters to more confidently manufacture sophisticated devices and high-frequency systems by hybrid 3D printing.

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“…Coaxial transformers are normally used in high-frequency radio applications because it confines the flux leakage inside of the transformer windings [1]. However, it is also possible to find some applications on the power electronics field [2] [3].…”

Section: Introductionmentioning

confidence: 99%

Inductances Design of High-Frequency Coaxial Transformers

Waltrich¹

2016

OALib

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In this paper is proposed a methodology to properly determine the leakage and magnetizing inductance of a single-phase high-frequency coaxial transformer. Both, leakage and magnetizing inductance equations are determined considering the transformer dimensions, the ferromagnetic characteristics, and the number of turners. Finite element methods (FEM) and a low scale prototype are also used to validate the equations. The results show that the leakage and magnetizing inductances can be precisely calculated with an error lower than 5% and 3%, respectively.

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The Use of Coaxial and Balanced Transmission Lines in Filters and Wide-Band Transformers for High Radio Frequencies

Cited by 24 publications

References 0 publications

Coaxial Low-Pass Filter Design and Manufacture

Coaxial Low-Pass Filter Design and Manufacture

High-Frequency Filters Manufactured Using Hybrid 3d Printing Method

Inductances Design of High-Frequency Coaxial Transformers

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