H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/53, 351/62
H01Q 15/00 (2006.01) H01Q 5/00 (2006.01)
Patent
CA 1198811
ABSTRACT An antenna apparatus of the type comprising a frequency separator having a plurality of frequency-selective reflecting surface members for separating electromagnetic waves and two electromagnetic horns for the feeding of said electromagnetic waves is described. Each of the surface members has a lattice in turn having a periodic pattern of conductive material and inherent resonance frequency; the inherent resonance frequencies of the various surface members are substantially equal to each other. The lattice is capable of serving as an inductive-capacitive circuit element at a specific frequency region lower than the inherent resonance frequency and exhibiting substantially equal induc- tance and capacitance with respect to the electromagnetic waves when made obliquely incident in the transverse electric and transverse magnetic modes. The surface members are disposed to have an interactive resonance at a fre- quency lying within the specific frequency region. The frequency separator solves a problem of prior separators, namely that incoming waves of the two different modes have different resonant frequencies if those waves inpinge ob- liquely on the separator.
395754
Iwata Ryuichi
Sato Ikuro
Tamagawa Susumu
Nippon Electric Co. Ltd.
Smart & Biggar
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