Patent EP0481825A2 successfully refreshed from Google Patents.
EP0481825A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Antenna switching apparatus for a dual-mode transceiver
Assignee: Sony Corp
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Filing: 1991-10-18
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Granted: —
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Expires: 2011-10-18
Abstract
Abstract The present invention is directed to an antenna switching apparatus for a dual-mode transceiver which includes a transmission and reception antenna, a transmitting circuit, a receiving circuit and a separating filter of large insertion loss provided among the transmission and reception antenna, the transmitting circuit and the receiving circuit and which separates a transmission high frequency signal and a reception high frequency signal having different carrier frequencies, in which transmission and reception in the digital mode of the transmission and reception switching system and the transmission and reception in the analog mode of the simultaneous transmission and reception system can be made possible. This antenna switching apparatus is comprised of an analog-to-digital change-over switch (16) which changes-over mutual connections among the transmission (1) and reception antenna (2), the transmitting circuit (1), the receiving circuit (2) and the separating filter in response to the analog or digital mode, a blocking filter of low insertion loss for blocking a high band of spurious caused by the switching of a transmission and reception change-over switch which changes-over the transmission and reception in the digital mode and a bandpass filter (5) of low insertion loss for passing therethrough the reception high frequency signal in the digital mode, thereby a power consumption in the digital mode being reduced considerably.
Inventors
- 👤 Seijiro Ishizuka
- 👤 Kitakubo Kazuto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 22:14
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/50; H04B1/52; H04B1/44
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
274 words
An antenna switching apparatus for a dual-mode transceiver having a transmission and reception antenna, a transmitting circuit, a receiving circuit and a separating filter of large insertion loss provided among said transmission and reception antenna, said transmitting circuit and said receiving circuit and which separates a transmission high frequency signal and a reception high frequency signal having different carrier frequencies, in which transmission and reception in the digital mode of the transmission and reception switching system and the transmission and reception in the analog mode of the simultaneous transmission and reception system can be made possible, comprising: (a) a first analog-to-digital change-over switch whose movable contact is connected to said transmission and reception antenna; (b) a second analog-to-digital change-over switch whose analog side fixed contact and movable contact are connected between said separating filter and said receiving circuit; (c) a third analog-to-digital change-over filter whose movable contact and analog side fixed contact are connected to said transmitting circuit and said separating filter; (d) a transmission and reception change-over switch whose transmission side fixed contact and reception side fixed contact are respectively connected to said transmitting circuit and said receiving circuit and which changes-over the transmission and the reception in the digital mode; (e) a blocking filter of low insertion loss connected between said first analog-to-digital change-over switch and said transmission and reception change-over switch and locking a high band of a spurious caused by the switching of said transmission and reception change-over switch; and (f) a bandpass filter of low insertion loss connected between said transmission and reception change-over switch and said second analog-to-digital change-over switch and passing therethrough said reception high frequency signal.
Claim 2
Dependent Claim
47 words
The antenna switching apparatus according to claim 1, wherein said separating filter is composed of a first bandpass filter for passing therethrough said reception high frequency signal in said analog mode and a second bandpass filter for passing therethrough said transmission high frequency in said analog mode.
Claim 3
Dependent Claim
39 words
The antenna switching apparatus according to claim 1 or 2, wherein said analog side fixed contact and said digital side fixed contact of said first analog-to-digital change-over switch are respectively connected to said separating filter and said blocking filter.
Claim 4
Dependent Claim
40 words
The antenna switching apparatus according to claim 1, 2 or 3 wherein said blocking filter is connected between said digital side fixed contact of said first analog-to-digital change-over switch and the movable contact of said transmission and reception change-over switch.
Claim 5
Dependent Claim
38 words
The antenna switching apparatus according to claim 1, 2, 3 or 4 wherein said blocking filter is a low-pass filter which passes therethrough said transmission high frequency signal and said reception high frequency signal in said digital mode.
Claim 6
Dependent Claim
44 words
The antenna switching apparatus according to any one of claims 1 to 5 wherein said bandpass filter is connected between said reception side fixed contact of said transmission and reception change-over switch and said digital side fixed contact of said second analog-to-digital change-over switch.
Claim 7
Dependent Claim
33 words
The antenna switching apparatus according to any one of claims 1 to 6 wherein said bandpass filter is a bandpass filter which passes therethrough said reception high frequency signal in said digital mode.
Claim 8
Dependent Claim
264 words
An antenna switching apparatus for a dual-mode transceiver having a transmission and reception antenna, a transmitting circuit, a receiving circuit and a separating filter of large insertion loss provided among said transmission and reception antenna, said transmitting circuit and said receiving circuit and which separates a transmission high frequency signal and a reception high frequency signal having different carrier frequencies, in which transmission and reception in the digital mode of the transmission and reception switching system and the transmission and reception in the analog mode of the simultaneous transmission and reception system can be made possible, comprising: (1) a first analog-to-digital change-over switch whose movable contact is connected to said transmission and reception antenna via a bandpass filter of low insertion loss which passes therethrough said transmission high frequency signal and said reception high freguency signal; (2) a second analog-to-digital change-over switch whose movable contact is connected to said separating filter and whose analog mode fixed contact is connected to said analog mode fixed contact of said first-to-digital change-over switch; (3) a 3-terminal isolator of low insertion loss having first, second and third terminals in which said first terminal is connected with said transmitting circuit and said third terminal is connected to the digital mode fixed contact of said second analog-to-digital change-over switch; and (4) a third analog-to-digital change-over switch whose movable contact is connected to said second terminal of said 3-terminal isolator, whose analog mode fixed contact is connected to said separating filter and whose digital mode fixed contact is connected to said digital mode fixed contact of said first analog-to-digital change-over switch.
Claim 9
Dependent Claim
74 words
The antenna switching apparatus according to claim 8, wherein said 3-terminal isolator permits a signal to be supplied from said first terminal to said second terminal and inhibits the supply of a signal from said second terminal to said first terminal, while said 3-terminal isolator permits a signal to be supplied from said second terminal to said third terminal and inhibits the supply of a signal from said third terminal to said second terminal.
Claim 10
Dependent Claim
203 words
An antenna switching apparatus for a dual-mode transceiver having a transmission and reception antenna, a transmitting circuit, a receiving circuit and a separating filter of large insertion loss provided among said transmission and reception antenna, said transmitting circuit and said receiving circuit and which separates a transmission high frequency signal and a reception high frequency signal having different carrier frequencies, in which transmission and reception in the digital mode of the transmission and reception switching system and the transmission and reception in the analog mode of the simultaneous transmission and reception system can be made possible, comprising: (A) an analog-to-digital change-over switch whose movable contact and analog side fixed contact are connected between said transmitting circuit and said separating filter; (B) a transmission and reception change-over switch whose transmission side fixed contact is connected to the digital side fixed contact of said analog-to-digital change-over switch and whose reception side fixed contact is connected to said separating filter; and (C) a blocking filter of low insertion loss connected between said transmission and reception antenna and the movable contact of said transmission and reception change-over switch and blocking a high band of a spurious caused by the switching of said transmission and reception change-over switch.
Claim 11
Dependent Claim
40 words
The antenna switching apparatus according to claim 10, wherein said block filter is a low-pass filter of two-way type which passes therethrough both of said transmission and reception high frequency signals in said analog mode and in said digital mode.
Claim 12
Dependent Claim
56 words
The antenna switching apparatus according to claim 8, 10 or 11 wherein said separating filter is composed of a first bandpass filter which passes therethrough said reception high frequency signal in said analog mode and in said digital mode and a second bandpass filter which passes therethrough said transmission high frequency signal in said analog mode.
References Cited (Backward Citations)
No citation records indexed.
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