Please select the most similar patent number from A, B, C and D. Which number is?
A shielding device used for wireless testing. The shielding device comprises: a guide rod (10), side walls (12), a directional antenna (11), and a wave absorbing layer (13), wherein the directional antenna (11) is fixed to the guide rod (10), the wave absorbing layer (13) is provided on a bottom surface of the shielding device, the side walls (12) are arranged around the shielding device, and the guide rod (10) is fitted and fixed with a top part of the side walls (12); a coverage area of the wave absorbing layer (13) is larger than a main lobe radiation area of the directional antenna (11) at the bottom surface of the shielding device. The shielding device has the advantage of having a low cost.
A: A microwave shielding door (10) and a microwave steam oven (100) comprising same. The microwave shielding door (10) comprises: a first shielding plate (11), the region of the first shielding plate (11) facing a cavity body of a microwave cooking cavity (101) forming a first shielding region; a second shielding plate (12), the first shielding plate (11) being connected to a first surface (12-1) of the second shielding plate (12), and the area of the second shielding plate (12) being larger than that of the first shielding plate (11); a door body (13), a second surface (12-2) of the second shielding plate (12) being mounted on the door body (13); and a sealing ring (14), the sealing ring (14) being spaced apart from the first shielding plate (11), and the region, facing the cavity body of the microwave cooking cavity (101), of the second shielding plate (12) on the inner side of the sealing ring (14) forming a second shielding region. The microwave shielding door (10) can effectively shield microwaves leaking out of a microwave device.
B: Provided are a temperature measuring component (10) for a microwave equipment (1) and microwave equipment (1) having the same. The temperature measuring component (10) comprises: a conducting wire (11); a first housing (12); a second housing (13); and a shielding layer (14) for shielding from an interference signal. The first housing (12) has a first accommodation chamber (121) provided with a temperature sensing member (122) therein. A first end (11a) of the conducting wire (11) extends to the first accommodation chamber (121) to connect with the temperature sensing member (122). The second housing (13) has a second accommodation chamber (131), and the conducting wire (11) is adapted to electrically connect with the second housing (13). At least a portion of the conducting wire (11) located between the first housing (12) and the second housing (13) is covered by the shielding layer (14). The temperature measuring component (10) for the microwave equipment (1) and the microwave equipment (1) having the same have simple structures and can detect food temperature conveniently.
C: A thin-film antenna, a display module, and a display apparatus. The thin-film antenna comprises a first region (AA) and a second region (BB). The thin-film antenna comprises: an antenna function layer (12), a first film layer (13), and a lead layer (14) that are stacked; the antenna function layer (12) comprises an antenna coil; the antenna coil is located in the first region (AA); the lead layer (14) comprises a lead (141) and a terminal (142) connected to the lead (141); the terminal (142) is located in the second region (BB); the lead (141) is connected to the antenna coil by means of a via hole provided on the first film layer (13). The thin-film antenna provided in the present embodiment can be attached to the back of a display panel, and there is no need to provide, between the antenna and the display panel, components such as a middle frame for shielding a signal. Therefore, an antenna function can be used directly on a screen side. For a terminal devices having a screen folded outside, NFC identification, etc. can be performed directly in a folded state, thereby improving the convenience of use.
D: A support platform and an antenna measurement isolation room, solving the technical problem that, with an upwardly-spiked wave absorbing material (81) being densely arranged on the ground, the wave absorbing material (81) is prone to be stepped on by a testing staff member. The technical solution primarily comprises: a test table (11), several middle plates (12) slidably stacked on the test table (11), and a support plate (13) sliding on the middle plate (12) at the top position. The test table (11), the middle plates (12), and the support plate (13) are provided therebetween with sliding components used for restricting vertical sliding relative to each other. The sliding components comprise barrier components restricting the test table (11), the middle plates (12), and the support plate (13) from slipping off each other. Mounted on the test table (11) is a power component for pushing the support plate (13) to slide and thereby implementing stepped telescoping of the support plate (13) and the middle plates (12), thus achieving the effect of reducing damages to the wave absorbing material (81) by means of telescopingly transporting outdoors an electronic device on the test table (11).
Answer: D