Patent EP0446050A2 successfully refreshed from Google Patents.
EP0446050A2
Expired / Lapsed
EP
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Signal transmission/reception switching apparatus
Assignee: Sony Corp
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Filing: 1991-03-07
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Granted: —
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Expires: 2011-03-07
Abstract
Abstract The present invention relates to a signal transmission reception switching apparatus in which characteristic impedance lines of 1/4 of wavelengths of transmission and reception signals and semiconductor switches are combined to each other so that the switching operation can be effected without passing the transmission and reception signals through the semiconductor switches.
Inventors
- 👤 Norio Shimo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 13:49
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/52; H01Q1/521; H01Q1/525; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
A signal transmission/reception switching apparatus in which a transmission signal and a reception signal are selectively switched to access an antenna, comprising: (a) a first transmission line connected between a terminal to which said transmission signal is supplied and an antenna terminal; (b) a second transmission line and a first switching element connected in series between said terminal to which said transmission signal is supplied and the ground; (c) a third transmission line connected between said antenna terminal and a terminal to which said reception signal is supplied; and (d) a fourth transmission line and a second switching element connected in series between said terminal to which said reception signal is supplied and the ground, the length of each of said first to fourth transmission lines being selected to be 1/4 of an average wavelength λ of said transmission and reception signals, wherein when said transmission signal is transmitted, said first switching element is turned ON and said second switching element is turned OFF, while when said reception signal is received, said first switching element is turned OFF and said second switching element is turned ON.
Claim 2
Dependent Claim
19 words
A signal transmission/reception switching apparatus according to claim 1, wherein said first to fourth transmission lines are coaxial lines.
Claim 3
Dependent Claim
28 words
A signal transmission/reception switching apparatus according to claim 1 or 2, wherein each of said first and second switching elements includes a switching diode and a switching transistor.
Claim 4
Dependent Claim
17 words
A signal transmission/reception switching apparatus according to claim 3, in which said switching diodes are PIN diodes,
Claim 5
Dependent Claim
33 words
A signal transmission/reception switching apparatus according to claim 1, 2, 3 or 4 wherein said first to fourth transmission lines and said first and second switching elements are arranged in a multiple-stage fashion.
Claim 6
Dependent Claim
43 words
A signal transmission/reception switching apparatus as claimed in claim 1, 2, 3, 4 or 5 whereon said first transmission lines includes first to third coaxial lines connected in series and said third transmission line includes fourth to sixth coaxial lines connected in series.
Claim 7
Dependent Claim
40 words
A signal transmission/reception switching apparatus as claimed in claim 6, wherein the length of each of said first and third coaxial lines is selected to be λ/4, while the length of said second coaxial line is selected to be λ/2.
Claim 8
Dependent Claim
38 words
A signal transmission/reception switching apparatus as claimed in claim 7, wherein the length of each of said fourth and sixth coaxial lines is selected to λ/4, while the length of said fifth coaxial line is selected to λ/2.
Claim 9
Dependent Claim
15 words
A telephone including signal transmission/reception switching apparatus according to any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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