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3 dB 90 Degree Hybrid Couplers 300407125


Model Number


Freq. Min. (GHz)


Freq. Max. (GHz)

Amplitude Imbalance (dB)
± 1.0
Phase Imbalance (Degrees)
± 5
Isolation (dB Min)
VSWR (Max)
Insertion Loss (dB Max)


0.4 – 7.125 GHz Frequency Operation

3 dB Coupling

Amplitude Imbalance: ±1.0 dB

Phase Imbalance: ±5 Degrees

Compact Package: SMA Female Connectors

Custom Designs Available

Product Description

KRYTAR 90 Degree Hybrid Couplers are four-port components with dual input and output ports. KRYTAR’s hybrid couplers offer wide frequency coverage in single, compact packages, which provide low insertion loss, high directivity and tight coupling. These hybrid couplers offer simple solutions in many applications within those frequency bands including electronic warfare (EW), commercial wireless, SATCOM, radar, signal monitoring and measurement, antenna beam forming, and EMC testing environments. For many space-restricted situations the compact size of these KRYTAR couplers are ideal. These couplers can be also be manufactured to meet military specifications.

KRYTAR’s new 90-Degree hybrid coupler, Model 300407125, delivers exceptional versatility from 0.4 to 7.125 GHz with excellent phase and amplitude matching. Typical specifications include 3 dB Coupling; Amplitude Imbalance: ±1.0 dB; Phase Imbalance is ±5 degrees; Isolation is >19 dB; Maximum VSWR: 1.3; and Insertion Loss of <1.8 dB.

In addition, Model 300407125 offers Input Power Rating of 20 W average and 3 kW peak. The hybrid coupler comes with industry-standard SMA Female Connectors. The compact package measures just 8.15 inches (L) x 1.25 inches (W) x 0.52 inches (H), and weighs only 8.3 ounces. Operating temperature is -54° to 85° C. This coupler is typically available from stock to 30 days, ARO.

KRYTAR also offers complete engineering services for custom designs that meet or exceed critical performance and/or packaging specifications.

Common Definitions

Microwave Frequency Bands
Band Designation Frequency Range (GHz)
UHF 300 MHz – 1.0 GHz
L 1.0 – 2.0
S  2.0 – 4.0
C  4.0 – 8.0
X  8.0 – 12.0
DBS  12.2 – 12.7
Ku  12.0 – 18.0
K 18.0 – 26.5
Ka  26.5 – 40.0
Q 30.0 – 50.0
U 40.0 – 60.0
V  50.0 – 75.0

90 Degree Hybrid Couplers: Four-port components, often referred to as quadrature hybrid couplers, as a signal applied to any input will result in two equal amplitude signals that are quadrant (90 degrees apart).

Couplers are passive microwave components used for distributing or combining microwave signals. Directional couplers are four-port circuits where one port is isolated from the input port.

Amplitude Imbalance: The amount of level variation between a hybrid’s two outputs

The coupled port on a microstrip, or stripline directional coupler, is closest to the input port because it is a backward wave coupler. On a waveguide broadwall directional coupler, the coupled port is closest to the output port because it is a forward wave coupler.

Gigahertz (GHz): A unit of measurement denoting the number of cycles in one second. One GHz is one billion cycles every second.

Megahertz (MHz): Equal to 1 million Hz. Uses the SI Prefix Mega, meaning 10^6.

VSWR (Voltage Standing Wave Ratio): The ratio of the maximum voltage to the minimum voltage in standing wave pattern along the length of a transmission line structure. It varies from 1 to (plus) infinity and is always positive. VSWR can be converted to return loss or the reflection coefficient.

Insertion Loss: In telecommunications, Insertion Loss is the loss of signal power resulting from the insertion of a device in a transmission line or optical fiber and is usually expressed in decibels, or dB.

Isolation: In telecommunications, Isolation refers to the ability to prevent a signal from appearing at a node in a circuit where it is unwanted and is expressed in decibels, or dB.

Operating Temperature: An operating temperature is the temperature at which an electrical device operates. The device will operate effectively within a specified temperature range which varies based on the device function and application context, and ranges from the minimum operating temperature to the maximum operating temperature (or peak operating temperature). Outside this range of safe operating temperatures the device may fail.


The fifth generation (5G) of cellular service, superseding 4G LTE. Governed by the 3GPP, 5G will increase transmission speed dramatically and embrace prioritization. As wireless data increases exponentially, real-time content such as video calling and video streaming must be given a higher priority than data on Web pages.

5G NR (5G New Radio)

The 5G new radio access technology (RAT) air-interface is a global standard, which like 4G also uses OFDM modulation, and is designed to deliver data rates up to 20 Gbps, enabling individual users to get gigabit-per-second downloads over the air (OTA). Wireless virtual reality (VR) and augmented reality (AR) can become commonplace, and 5G is expected to provide a huge boost for connecting billions of Internet of Things (IoT) devices.

Wi-Fi 6

Wi-Fi 6 is the most recent iteration of the IEEE standard for wireless local-area network (WLAN) protocol and is a substantial upgrade over its predecessors Wi-Fi 4 and Wi-Fi 5. Wi-Fi 6 operates between 2.4 GHz and 5 GHz. Wi-Fi 6 can be significantly faster due to technologies like traffic prioritization, OFDMA, and beamforming.

Wi-Fi 6E

Wi-Fi 6E operates at 6 GHz (5.925–7.125 GHz in the U.S.) and also the 2.4 GHz or 5 GHz devices already in use. Wi-Fi 6E-enabled devices can take advantage of the newer 6 GHz frequency band for further improved connectivity.

Additional Resources

For more information on Krytar’s Couplers please see below:

KRYTAR Ultra-Broadband Microwave Components and Test Equipment DC-67 GHz

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