As this antenna radiates or receives perpendicular to the dipole plane into all directions, economical testing set-ups with two or more simultaneous functions are possible.
Application as an E Field Sensor
The passive biconical Test Antenna UBA 9116 has primarily been designed for field-strength measurements in the range 300 MHz to 1 GHz, but may be used with dipole-like antenna factors between 200 MHz and 1.3 GHz. Such passive antennas with identical gain data can be accurately calibrated under free-space conditions with the “Two-Antenna-Method” that does not require a gain standard. The measurement uncertainty can be reduced to less than 1 dB under near-perfect free-space conditions using a method developed here with simultaneous height-variation and averaging the results.
The aim of designing E field sensors might be a very short dipole length to measure the fieldstrength on a defined “spot”.
In case of immunity testing of practical equipment, e.g. of 19″ boxes, the surface or volume of the EuT must be tested. In case of varying field-strengths a final definition must be established. An alternative method could be the use of an E field sensor of a comparable size compared to the EuT. With a total length of the biconical antenna of 325 mm this condition is met for a number of applications. One of these applications is the field-strength measurement at a separation of 3m in front of the tip of a logarithmic-periodic antenna for immunity testing such as IEC 801-3,IEC 1000-4-3, ENV 50140, VDE 0847, part 3, also EN 50147.
| Frequency Range (useable) | 160 – 1100 MHz |
| Main Frequency Range | 300 – 1000 MHz |
| Isotropic Gain | + 1.3 dBi … -1.4 dBi |
| Gain over l/2 Dipole | – 0.9 dBd … -3.6 dBd |
| Return loss f > 250 MHz | typ. 4 dB |
| Ret. loss f > 250 MHz, 3 dB pad | typ. 10 dB ~ SWR 2 |
| Antenna Factor | 18 – 30 dB/m |
| Length holder | 520 mm |
| Length holder with cones | 570 mm |
| Width: | 325 mm |
| Antenna shaft (Tube) | 22 mm |
| Total weight | 0.83 kg |
| Power (EMC TX) | 5 W |
| Coaxial Connector | N – female |