Transmit and receive antenna switch
First Claim
1. Device comprising:
- at least two transmitting branches each for transmitting signals via at least one frequency band;
at least two receiving branches each for receiving signals via at least one frequency band;
an antenna switch for switching said transmitting branches; and
an antenna coupled to said branches via said antenna switch;
wherein said antenna switch comprises;
at least one first semiconductor switch in series coupled between a first transmitting branch and said antenna;
at least one second semiconductor switch in series coupled between a second transmitting branch and said antenna; and
at least one third semiconductor switch coupled in parallel to at least one receiving branch;
wherein said antenna switch is transmission-line-less.
3 Assignments
0 Petitions
Accused Products
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.
45 Citations
9 Claims
-
1. Device comprising:
-
at least two transmitting branches each for transmitting signals via at least one frequency band; at least two receiving branches each for receiving signals via at least one frequency band; an antenna switch for switching said transmitting branches; and an antenna coupled to said branches via said antenna switch; wherein said antenna switch comprises; at least one first semiconductor switch in series coupled between a first transmitting branch and said antenna; at least one second semiconductor switch in series coupled between a second transmitting branch and said antenna; and at least one third semiconductor switch coupled in parallel to at least one receiving branch; wherein said antenna switch is transmission-line-less. - View Dependent Claims (2, 3, 4)
-
-
5. Device comprising:
-
at least two transmitting branches each for transmitting signals via at least one frequency band; at least two receiving branches each for receiving signals via at least one frequency band; an antenna switch for switching said transmitting branches; and an antenna coupled to said branches via said antenna switch; wherein said antenna switch comprises; at least one first semiconductor switch in series coupled between a first transmitting branch and said antenna; at least one second semiconductor switch in series coupled between a second transmitting branch and said antenna; at least one third semiconductor switch coupled in parallel to at least one receiving branch; at least one transmission line of which one side is coupled to one side of said first semiconductor switch and to said antenna, with the other side of said transmission line being coupled to said third semiconductor switch, and a tap of said transmission line being coupled to one side of said second semiconductor switch; and
a transistor switch per receiving branch coupled in series between said receiving branch and said transmission line.- View Dependent Claims (6)
-
-
7. Module for a device, said module comprising:
-
at least two transmitting branches each for transmitting signals via at least one frequency bands; at least two receiving branches each for receiving signals via at least one frequency band;
an antenna switch for switching said transmitting branches; andan antenna coupled to said branches via said antenna switch, wherein said antenna switch comprises; at least one first semiconductor switch in series coupled between a first transmitting branch and said antenna; at least one second semiconductor switch in series coupled between a second transmitting branch and said antenna; and at least one third semiconductor switch coupled in parallel to at least one receiving branch; wherein said antenna switch is transmission-line-less.
-
-
8. Antenna switch for switching transmitting branches each for transmitting signals via an antenna and at least one frequency band, with at least two receiving branches each receiving signals via a least one frequency band and said antenna, wherein said antenna switch comprises:
-
at least one first semiconductor switch to be coupled in series between a first transmitting branch and said antenna; at least one second semiconductor switch to be coupled in series between a second transmitting branch and said antenna; and at least, one third semiconductor switch to be coupled in parallel to at least one receiving branch; wherein said antenna switch is transmission-line-less.
-
-
9. Method of antenna switching for switching transmitting branches each for transmitting signals via an antenna and at least one frequency band, with at least two receiving branches each receiving signals via at least one frequency band and said antenna, which method comprises the steps of:
-
switching a first transmitting branch via at least one first semiconductor switch to be coupled in series between said first transmitting branch and said antenna, switching a second transmitting branch via at least one second semiconductor switch to be coupled in series between said second transmitting branch and said antenna, and switching at least one third semiconductor switch to be coupled in parallel to at least one receiving branch; wherein said antenna switching is transmission-line-less.
-
Specification