By M. J. Lancaster

ISBN-10: 0521480329

ISBN-13: 9780521480321

This publication describes the applying of latest extreme temperature superconducting fabrics to microwave units and structures. It bargains with the basics of the interplay among microwaves and superconductors, and features a uncomplicated description of ways microwave units might be developed utilizing those fabrics. because the discovery of extreme temperature superconductors in 1986 there was a huge attempt around the globe to improve and symbolize those fabrics. paintings on functions has proceeded extra slowly despite the fact that. however, advertisement functions are actually starting to come up, together with use in passive microwave units. the writer rigorously describes some great benefits of utilizing extreme temperature superconductors in those units, permitting scientists and engineers to shape a whole realizing of the topic. the remainder of the e-book is dedicated to examples of superconducting microwave filters, antennas and platforms. The examples selected relate not just to what could be accomplished at the present, yet point out the developments for destiny examine and what could be anticipated for superconducting units sooner or later. The ebook will attract researchers in electric and digital engineering.

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**Extra resources for Passive microwave device applications of high temperature superconductors**

**Example text**

This situation is often impossible to replicate in an actual circuit. There are also times where one might prefer one type of stub to the other. In these situations, one can transform a given set of stub configurations into another set of stub configurations. In this subsection, we recall the four classic Kuroda identities that can help solve these problems. 1 First Low-Pass Kuroda Identity The first low-pass Kuroda identity consists of a UE with characteristic impedance Z01 placed left of a series short-circuited stub with characteristic impedance Z02.

17 shows the case of a two-port network made of admittance placed in parallel. 18, the output voltage V2 and output current I2 are such that V2 = ZL − I2 . 17 Admittance placed in parallel. 18 Two-port connected to load impedance ZL. 19, the output voltage V2 and output current I2 are such that − I2 = YL V2 . 20 is equal to the multiplication of the individual ABCD matrices. 19 Two-port connected to load admittance YL. 20 I2′ A2 – Cascade of two systems. 21. 22. 23. 21 Two systems connected in parallel.

35. 35 First high-pass Kuroda identity. 4 Z01 Z01 Z02 Z01 2 = Z02 Z01 + Z02 Z01 + Z02 Second High-Pass Kuroda Identity The second high-pass Kuroda identity consists of a UE with characteristic impedance Z02 placed right of a series open-circuited stub with characteristic impedance Z01. 36. 36 Second high-pass Kuroda identity. 34 Microwave Amplifier and Active Circuit Design Using the Real Frequency Technique Equating A parameters gives cos θ + Z01 Y02 cos θ = cos θ n and dividing both sides by cos θ gives 1 + Z01 Y02 = 1 1 Z01 or = 1 + n n Z02 Equating C parameters gives jY02 sinθ = jY03 sinθ n and dividing both sides by sin θ gives jY02 = jY03 1 or Z03 = Z02 n n and replacing n gives Z03 = 1 + Z01 Z02 = Z01 + Z02 Z02 Equating D parameters gives cos θ = n cos θ + Z04 Y03 cos θ and dividing both sides by cos θ gives 1 = n 1 + Z04 Y03 from which we find that 1+ Z04 1 Z01 Z01 = =1+ or Z04 = Z03 Z03 n Z02 Z02 and replacing Z03 gives Z04 = Z01 Z01 Z03 = Z01 + Z02 Z02 Z02 Microwave Amplifier Fundamentals 35 References [1] [2] [3] [4] [5] [6] I.

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