Title :
A Frequency-Controlled Ultrawide Bandwidth Phase Shifter: Phase Shifting Without a Phase Shifter?
Author :
Fel, N. ; Morvan, P. ; NicolaÏ, J.p. ; Russat, J.
Author_Institution :
Commissariat ? l´´Energie Atomique, Centre de Bruy?res-le-Ch?tel, BP 12, F-91680 Bruy?res-le-Ch?tel - France. Tel.: 33 1 69264000 - Fax: 33 1 69267053
Abstract :
We present in this paper results about a high-frequency analog phase shifter suitable for multi-octave operation. Principles of this ultrawide bandwidth phase shifter are based upon the use of a frequency-tunable local oscillator (LO) feeding a delay element. Through proper frequency variation, two coherent phase-shifted LO signals are produced. The first LO signal is used for fundamental up-conversion with the incident radio-frequency (RP) signal; the phase-shifted RF output signal is then obtained by down-conversion, using the second LO sipal. Measurements done on a prototype indicate an over than 20:1 operational bandwidth, merely limited by filter band-width considerations.
Keywords :
Band pass filters; Bandwidth; Cutoff frequency; Delay; Local oscillators; Microwave filters; Phase shifters; Prototypes; RF signals; Radio frequency;
Conference_Titel :
Microwave Conference, 1999. 29th European
Conference_Location :
Munich, Germany
DOI :
10.1109/EUMA.1999.338511
