Suspended substrate-3 dB microwave quadrature coupler

Details Suspended substrate-3 dB microwave quadrature coupler Suspended substrate-3 dB microwave quadrature coupler

1981-02-04

1983-02-22

Gensler, Paul L.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333238, H01P 518

Patent

active

043750540

ABSTRACT:
A -3 dB microwave quadrature coupler is provided on a single layer dielectric substrate and employs only two conductor coupling lines and a relatively wide, cost efficiently manufacturable coupling gap. The substrate is suspended within a mounting case providing a minimum spacing above and below the substrate. The ground plane is on the bottom of the substrate. Microstrip conductor ports are on the top of the substrate and are connected to a pair of parallel spaced coplanar conductor lines on top of the substrate juxtaposed a cut-out region of the ground plane therebelow. The coplanar conductor lines are balanced and coupled to each other, not to the ground plane nor to the mounting case. The coupler is compact, with a reduced length of .lambda./8. The coupler is amenable to implementation on inexpensive low dielectric constant substrate material, still with a relatively wide coupling gap.

REFERENCES:
patent: 3593208 (1971-07-01), Smith
patent: 3621478 (1971-11-01), Johnson et al.
patent: 3659228 (1972-04-01), Napoli
Napoli, 3 dB Directional Coupler, RCA Technical Notes, TN No. 987, Nov. 26, 1974.

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