Planar QPSK demodulator

Details Planar QPSK demodulator Planar QPSK demodulator

1981-05-11

1982-09-28

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329112, 329116, 329137, 329204, 333116, 375 84, 455327, H04L 2722

Patent

active

043520715

ABSTRACT:
A microwave integrated circuit (MIC) quadrature phase shift keying (QPSK) modulator uses a novel arrangement of couplers to permit the IF ports to be adjacent one another so that, in mixer applications, it is unnecessary for the circuitry to leave the plane of the MIC. A symmetrical arrangement of the MIC ensures near-perfect phase orthogonality of the RF.sub.2 split and the power/phase identity of the RF.sub.1 split.

REFERENCES:
patent: 4027265 (1977-05-01), Koboyashi et al.
patent: 4281293 (1981-07-01), Childs et al.
Childs et al., "A 3-dB Interdigitated Coupler on Fused Silica", IEEE MIT-5 International Microwave Symposium Digest, 1977, pp. 370-372.
Cochrane et al., "Thin-Film Mixers Team Up to Block Out Image Noise", Microwaves, Mar. 1977, pp. 34-40.
Kurpis et al., "Wideband X-Band Microstrip Image Rejection Balanced Mixer", IEEE MTT Symposium Digest, 1970, pp. 200-205.
Wilkinson, "An N-Way Hybrid Power Divider", IRE Transactions MTT, Jan. 1960, pp. 116-118.

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