A Millimeter-Wave Pulse Transmitter with a Harmonic Mixer

Kenji KAWAKAMI  Hiroshi IKEMATSU  Koichi MATSUO  Naohisa UEHARA  Moriyasu MIYAZAKI  Tadashi TAKAGI  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.10   pp.1947-1951
Publication Date: 2005/10/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.10.1947
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Technologies on Devices, Circuits, and Systems for Millimeter-wave ITS Applications)
millimeter-wave,  pulse transmitter,  harmonic mixer,  

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This paper describes a millimeter-wave pulse transmitter with a 38 GHz-band Voltage Controlled Oscillator (VCO) and a 77/38 GHz-band harmonic mixer. This harmonic mixer works as both of a pulse modulator and a multiplier. This configuration of the transmitter is very simple, and can be applied to high-speed pulse modulation like Ultra Wide Band. By using the harmonic mixer, furthermore, a fluctuation of the load impedance of the 38 GHz VCO can be reduced. Compared with the conventional configuration, the required amount of isolation between the VCO and the load has been able to be reduced by more than 30 dB as a result of the experiment in a millimeter-wave band.