Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
2007-06-19
2007-06-19
Zewdu, Meless (Department: 2617)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
C455S063300, C455S082000, C455S083000, C455S550100, C455S575700, C455S552100, C455S556200
Reexamination Certificate
active
10531033
ABSTRACT:
Antenna switches (1,10) in dual-band or multi-band mobile phones are according to a basic idea provided with a serial semiconductor switches (11,21,12,22) per transmitting branch (2,3) and with a further semiconductor switch (13,23) coupled in parallel to a receiving branch (4,5,6), to obtain isolation between branches (2-6) in a simple way. Said semiconductor switches are PIN diodes or MEMS switches or pHEMT switches. Another semiconductor switch (14) coupled in parallel to the receiving branches (4-6) allows together with said further semiconductor (13) the introduction of elements (15,16) without a transmission line. Alternatively, the antenna switch (1,10) may comprise a transmission line (24,25), in which case the receiving branches (4,5,6) can be switched via transistor switches (26,27,28). This all improves isolation, reduces costs, complexity, size and high Radio-Frequency (RF) losses.
REFERENCES:
patent: 6014551 (2000-01-01), Pesola et al.
patent: 6021318 (2000-02-01), Schaffer
patent: 6560444 (2003-05-01), Imberg
patent: 6633748 (2003-10-01), Watanabe et al.
patent: 6639489 (2003-10-01), Okuda et al.
patent: 6862436 (2005-03-01), Hayakawa et al.
patent: 7003312 (2006-02-01), Kemmochi et al.
patent: 7005940 (2006-02-01), Kodim
patent: 2002/0086644 (2002-07-01), Koskinen
patent: 1 152 543 (2001-11-01), None
patent: WO 00/38341 (2000-06-01), None
NXP B.V.
Zewdu Meless
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