Ferroelectric RF limiter

Details Ferroelectric RF limiter Ferroelectric RF limiter

1993-05-27

1994-07-12

Gensler, Paul

Wave transmission lines and networks

Automatically controlled systems

Limiting of amplitude

505703, H01P 122

Patent

active

053292618

ABSTRACT:
The ferroelectric limiter utilizes the bias voltage dependent dielectric constant property of a ferroelectric material. A main transmission line having a length of two or more half wavelengths at the operating frequency is used. A branch line is connected at one half wavelength away from one end of the transmission line. The branch line presents a very high impedance on the main transmission line at a low level of signal. The branch line contains a ferroelectric material. As the signal level increases, the dielectric constant of the ferroelectric material in the branch line changes. This reduces the impedance presented by the branch line on the main transmission line reducing the impedance of the main transmission line and the resulting output of the limiter. As the signal level increases, the impedance presented by the branch line on the main transmission line becomes increasingly smaller, further reducing the output of the of the limiter. Two designs of the limiter are presented. The limiter can be a part of a monolithic microwave integrated circuit (MMIC). The conductive coatings of the limiter can be a film of a single crystal high Tc superconductor material. The upper frequency limit of the ferroelectric limiter is determined by the relaxation frequency of the ferroelectric material such as 95 GHz for Strontium Titanate.

REFERENCES:
patent: 3309626 (1967-03-01), Higgins
Cohn et al., A High-Power Limiter, IEEE Trans. on MTT, Jan. 1965, pp. 47-54 TK7800I23.
Horton et al., A One-Ghz Ferroelectric Limiter, IEEE Trans. on MTT, Sep. 1967, pp. 517-523 TK7800I23.

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