Multiband patch antenna
This disclosure presents a multiband patch antenna which resonates in a second frequency band as well as in a first frequency band, i.e., a GNSS frequency band, by adding an antenna pin to a patch antenna. The presented multiband patch antenna includes a base substrate, an upper patch disposed on an upper surface of the base substrate, a lower patch disposed on a lower surface of the base substrate, a feed pin which passes through the base substrate, the upper patch, and the lower patch, and an antenna pin which is spaced apart from the feed pin and passes through the base substrate and the lower patch.
1 . A multiband patch antenna comprising:
a base substrate;
an upper patch disposed on an upper surface of the base substrate;
a lower patch disposed on a lower surface of the base substrate;
a feed pin which passes through the base substrate, the upper patch, and the lower patch;
an antenna pin which is spaced apart from the feed pin and passes through the base substrate and the lower patch to operate as a second antenna that resonates in a frequency band different from a frequency band of the upper patch; and
an inner conductor disposed on an inner wall surface of a through-hole passed by the antenna pin to prevent deterioration of the isolation between the upper patch and the antenna pin,
wherein the antenna pin passes through the base substrate in a second region of the upper surface of the base substrate where the upper patch is not disposed.
2 . The multiband patch antenna of claim 1 , wherein the upper surface of the base substrate is divided into a first region where the upper patch is disposed and a second region where the upper patch is not disposed.
3 . The multiband patch antenna of claim 2 , wherein the base substrate includes:
a first through-hole which is formed in the first region through the base substrate, and through which the feed pin passes; and
a second through-hole which is formed in the second region through the base substrate, and through which the antenna pin passes.
4 . The multiband patch antenna of claim 3 , wherein the inner conductor disposed on an inner wall surface of the second through-hole.
5 . The multiband patch antenna of claim 1 , wherein a first end of the antenna pin passes through the base substrate and the lower patch, and a pin head is formed at a second end of the antenna pin.
6 . The multiband patch antenna of claim 1 comprising:
a first antenna pin which is disposed adjacent to a first side of the upper patch, and which passes through the base substrate in a second region of the upper surface of the base substrate where the upper patch is not disposed; and
a second antenna pin which is disposed adjacent to a third side of the upper patch connected to a first end of the first side, and which passes through the base substrate in the second region of the upper surface of the base substrate where the upper patch is not disposed.
7 . The multiband patch antenna of claim 6 comprising a third antenna pin which is disposed adjacent to a second side of the upper patch facing the first side, and which passes through the base substrate in the second region of the upper surface of the base substrate where the upper patch is not disposed.
8 . The multiband patch antenna of claim 7 , wherein the antenna pin further includes a fourth antenna pin which is disposed adjacent to a fourth side of the upper patch connected to a second end of the first side, and which passes through the base substrate in the second region of the upper surface of the base substrate where the upper patch is not disposed.
9 . The multiband patch antenna of claim 1 , wherein the upper patch is provided with at least one accommodating groove formed therein for accommodating at least a portion of a pin head of the antenna pin.
10 . The multiband patch antenna of claim 9 , wherein the accommodating groove is formed by cutting off a portion of the upper patch, and is formed in a direction from a peripheral portion of the upper patch to the central point of the upper patch.
11 . The multiband patch antenna of claim 9 , wherein a number of the accommodating grooves is less than or equal to a number of the antenna pins.