Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1977-04-08
1978-11-14
Richardson, Robert L.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
325449, 333 26, 333 34, 333 84M, H04B 126, H03H 742
Patent
active
041258100
ABSTRACT:
A double slot balun has two pairs of coplanar, electric conductive sheets in a superposed, spaced, electrically insulated relation on opposite planar surfaces of a dielectric substrate forming two slots disposed in spaced, parallel planes. Unbalanced signals applied simultaneously to common ends of the slots result in balanced in-phase signals at the opposite end of the two slots. A constant impedance balun has two alined, electric conductive strips in a superposed, spaced, electrically insulated relation mounted on opposite planar surfaces of a dielectric substrate with the widths at opposite ends of each conductive strip being chosen for selected parallel-plate impedance characteristics and one conductive strip having a selected taper, preferably following a cosine curve, while the width of the other conductive strip is selected relative to the cosine taper along its length to provide a constant impedance at any point along the length of the two conductive strips. A broadband mixer has a common dielectric substrate with a double slot balun associated with an RF signal port and two of the constant impedance baluns associated with the LO signal port and in turn these baluns are interconnected with a double balanced bridge arrangement having two separate rings of matched diodes with no cross-over connections between the baluns or between the baluns and the diodes.
REFERENCES:
patent: 3419813 (1968-12-01), Kamnitsis
patent: 3523260 (1970-08-01), Gunshinan et al.
patent: 3652941 (1972-03-01), Neuf
patent: 3678395 (1972-07-01), Hunton et al.
patent: 3678418 (1972-07-01), Woodward
patent: 3735267 (1973-05-01), Napoli
patent: 3784933 (1974-01-01), Scherer et al.
patent: 4063176 (1977-12-01), Milligan et al.
Lewis, Jr. Ancel W.
Ng Jin F.
Richardson Robert L.
Vari-L Company, Inc.
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