肖特基中功率微波限幅器

供应肖特基中功率微波限幅器MICROWAVE LIMITERS, Schottky Turn-On

Medium Power, Low R.F. Leakage

FEATURES

Lowest insertion loss

High CW Power Handling

Low Leakage

Medium High Peak Power

Handling

Compact Size

Octave or Broadband

Optimization Available

Hermetic Package

Reduced Spike Leakage Over

Conventional Pin Limiters

SPECIALS & PERFORMANCE NOTES

The recovery time associated with this Series of limiter is in the range of 200 to 500 nanoseconds. The recovery time may be reducedto 50 to 100 nanoseconds by adding a discharge path speed-up resistor. By choosing the proper resistance value, this only raises the leakage power a few tenths of a dB. The speed-up resistor can also be tailored to raise the turn-on point (1 dB compression). The normal turn-on is approximately +5 to +10 dBm. This can be raised to +20 dBm or any point in between. The maximum leakage also increases.

The limiters may be used as switch/limiter by eliminating one of the d.c. blocks and applying bias on the center conductor. This will reverse bias the Schottky diode while forward biasing the PIN diodes. Since this bias level is usually one volt across the PIN diodes, there is no danger of harming the Schottky.

These limiters operate as reflective devices. In some uses, a good match is required for proper operation. Omniyig limiters can be integrated with an isolator on one or both ports.

The second PIN diode may be eliminated to improve insertion loss. This changes the leakage curves to be similar to the conventional PIN limiters. The leakage power is 3 dB or 4 dB lower than conventional PIN limiters. The power handling is lowered. These designs can be modified and diodes selected to handle 3 dB higher power.

DESCRIPTION

Omniyig‘s Schottky turn-on limiters are designed for octave-band performance, although their multi-octave performance is excellent. The OLP2644A is an 8.0 to 16.0 GHz unit with SMA connectors. This limiter performs quite well from 2.0 to 18.0 GHz and extremely well from 4.0 to 18.0 GHz. In the 2.0 to 4.0 GHz frequency range, this unit‘s insertion loss may increase slightly due to Ku-band d.c. blocks and the leakage power will rise slightly due to X-Ku-band diode spacing. The OLP2716A is a 1.0 to 2.0 GHz unit with SMA connectors. This limiter performs quite well from 0.5 to 6.0 GHz. There are models which are optimized for any octave from 0.1 to 18.0 GHz. All limiters are available with SMA connectors, or cylindrical module, or rectangular module for stripline or microstrip applications. Limiters are normally supplied with internal d.c. block, but can be supplied with one or both d.c. blocks eliminated. Limiters may be supplied with other connector options as specials.

The Omniyig Schottky turn-on limiters are optimized for low insertion loss and VSWR at <= 0 dBm. At and above the turn-on point (+5 to +10 dBm), these limiters operate as variable shunt R.F. impedances and are therefore reflective.

These limiters are fabricated from semiconductor chips utilizing high temperature die attach and thermocompression bonding techniques. The limiters are hermetically sealed.

APPLICATIONS

Omniyig limiters are designed to be used in a number of applications. The first and most common is to protect from burn-out during high CW power (up to 10 watts) and medium high peak power (up to 1 KW). These types of limiters have been put in front of tunnel diode amplifiers, detectors, mixers, and other sensitive microwave components or receivers.