Microstrip line structures
The invention is related to a microstrip line structure, which comprises: a first microstrip line and a second microstrip line, paralleled with the first mircostrip line for transferring a transmission signal, and a plurality of grooves periodically arranged on both sides of the second microstrip line by using subwavelength, and each period length in the plurality of grooves is smaller than the wavelength of the transmission signal.
1. A microstrip line structure, comprising:
a first microstrip line; and
a second microstrip line, parallelled with the first micro strip line, for transferring a transmission signal, and two sides of the second microstrip line have a plurality of grooves subwavelength periodically arranged on the two sides, an opening of each groove has two extension parts serially extending to the center of the groove, a periodic length of the plurality of grooves is smaller than wavelength of the transmission signal.
2. The microstrip line structure of claim 1 , wherein the first microstrip line is one of a straight line and a curved line, and the second microstrip line corresponding to the first microstrip line is the straight line/curved line.
3. The microstrip line structure of claim 1 , further comprising:
an impedance gradation area, coupled to one terminal of the first/second microstrip line, and the impedance gradation area comprises a plurality of groove with different sizes.
4. The microstrip line structure of claim 1 , further comprising:
a base plate, for mounting the first and second micro strip lines and a third micro strip line, which is mounted one side of the second micro strip line.
5. The micro strip line of claim 4 , wherein the first, second and third microstrips respectively have two terminal ports.