同轴线是一种屏蔽且非色散的结构，而且同轴线中导波的主模是TEM波，但同时也可传输TE模和TM模，其截止频率为零，对应截止波长趋向于无穷大。是由同轴的两根内、外导体及中间的电介质构成的双导体传输线。一般同轴线外导体接地，电磁场被限定在内外导体之间，所以同轴线基本没有辐射损耗，几乎不受外界信号干扰。其工作频带比双线传输线宽，可以用于大于厘米波的波段。
以下是对JAE FI-JZ50C-R6000极细同轴线的分析
Along with the size minimization and slimming of small portable devices such as mobile phones, high-speed signal transmission inside these devices is increasing due to higher performance and the incorporation of multiple functions.The FI-JZ series is a 0.9mm mating height, 0.25mm contact pitch, vertical connecting fine-wire coaxial connector designed to meet the demand for more compact, lower profile connectors with anti-noise performance.
特征：
- Industry's smallest size and height, 0.25mm pitch, vertical connection to allow for minimization and slimming.
- Mated dimensions of 0.9mm max. height, 2.08mm depth, and 16.29mm width (for 50 position).
- Enhanced connection stability with gold plated ground contact points on plug and receptacle.
- Low profile, under 1mm mating height achieved in a vertical connector by using a structure in which the receptacle contacts hold the plug contacts.
- Plug connector ground bar is a common type to improve workability. (Same ground bar as FI-JP and FI-JHS series).
- Applicable wire: compatible with #44 AWG(Note 1), #46 AWG fine-wire coaxial.
- Note 1: Applies to 0.25mm max. cable outer diameter.
- Plug has a compact design to pass through a small-hinge from back side.
- Supports automated mounting with embossed tape for receptacle.
- Solder migration prevention structure with Nickel barrier on receptacle.
用途：
Small portable devices such as mobile phones, high-speed signal transmission inside these devices.
一般规格：
| Number of Positions |
50 positions |
| Rated Current |
AC, DC 0.2 A/ terminal |
| Rated Voltage |
AC, DC 50 V/ terminal |
| Contact Resistance |
70 milliohm max. (initial), 100 milliohm max. (after test), variation 60 milliohm max. |
| Insulation Resistance |
10 megohm (after test) |
| Dielectric Withstanding Voltage |
100 VACr.m.s. (1 minute) |
| Operating Temperature Range |
-40 deg. C to +85 deg. C |
| Durability |
20 time |
