Splitter

1. A splitter, comprising:

an input terminal;

a first output terminal;

a second output terminal;

a first transmitting unit, comprising:

a first microstrip, coupled between the input terminal and a first node;

a second microstrip, coupled between the input terminal and a second node; and

a first resistor, coupled between the first node and the second node; and

a second transmitting unit, comprising:

a third microstrip, coupled between the first node and the first output terminal;

a fourth microstrip, coupled between the second node and the second output terminal; and

a second resistor, coupled between the first output terminal and the second output terminal;

wherein lengths of the first microstrip and the second microstrip are substantially equal to a first length related to a first frequency, lengths of the third microstrip and the fourth microstrip are substantially equal to a second length related to a second frequency, and the first frequency and the second frequency are different;

wherein the first output terminal and the second output terminal are substantially isolated within a first frequency band and a second frequency band, and the first output terminal and the second output terminal are substantially conductive at frequencies out of the first frequency band and the second frequency band;

wherein a center frequency of the first frequency band is the first frequency, and a center frequency of the second frequency band is the second frequency.

2. The splitter of claim 1 , wherein the first length is substantially equal to a quarter of a wavelength of a first radio frequency signal corresponding to the first frequency, and the second length is substantially equal to a quarter of a wavelength of a second radio frequency signal corresponding to the second frequency.

3. The splitter of claim 1 , wherein the first length and the second length are substantially multiplicative with each other.

4. A splitter, comprising:

an input terminal;

a plurality of output terminals; and

a plurality of transmitting units, serially connected as a sequence, each transmitting unit comprising:

a resistor node;

a plurality of front-stage nodes;

a plurality of back-stage nodes;

a plurality of microstrips, coupled between the plurality of front-stage nodes and the plurality of back-stage nodes; and

a plurality of resistors, each of the resistors coupled between one of the plurality of back-stage nodes and the resistor node;

wherein the plurality of front-stage nodes of a forefront transmitting unit among the plurality of transmitting units are coupled to the input terminal, the plurality of back-stage nodes of a last transmitting unit among the plurality of transmitting units are coupled to the plurality of output terminals, and the plurality of back-stage nodes of a former transmitting unit of two adjacent transmitting units are the plurality of front-stage nodes of a latter transmitting unit of the two adjacent transmitting units;

wherein lengths of the plurality of microstrips of each of the transmitting units are substantially equal and related to a frequency, and the plurality of transmitting units are related to a plurality of frequencies according to microstrip lengths, such that the plurality of transmitting units are divided into a plurality of transmitting unit modules according to the lengths of the plurality of microstrips of each of the transmitting units;

wherein the plurality of output terminals are substantially isolated within a plurality of frequency bands, and the plurality of output terminals are substantially conductive at frequencies out of the plurality of frequency bands;

wherein a center frequency of each of the plurality of frequency bands is a frequency of the plurality of frequencies.

5. The splitter of claim 4 , wherein the lengths of the plurality of microstrips of each of the transmitting units are substantially equal to a quarter of a wavelength of a radio frequency signal corresponding to the frequency.

6. The splitter of claim 4 , wherein a first transmitting unit and a second transmitting unit in one of the plurality of transmitting unit modules are separated by a third transmitting unit in another one of the plurality of transmitting unit modules.

7. The splitter of claim 4 , wherein each of the transmitting units in one of the plurality of transmitting unit modules is serially connected together.