Passive Components

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One of the major applications for ferrite junction components is in base station amplifiers. Each amplifier module may include several isolators, which typically provide mismatch protection. In the case of the isolator placed between the power amplifier and the antenna, the primary purpose is protection against high levels of...

In recent years, there has been a growing interest in electromagnetic bandgap structures (EBG), which exhibit the properties of rejecting electromagnetic waves at certain frequencies. The most interesting applications for these structures are the filtering of frequency bands or the suppression of undesired spurious passbands and harmonics in microwave...

Microstrips (MS) and coplanar waveguides (CPW) are two of the main waveguide structures used in higher frequency applications, because of their compatibility with monolithic fabrication and solid-state devices. In CPW, the signal lines and ground planes are placed on one side of the substrate, permitting a circuit consisting of...

Product Feature:

Surface-mount Coaxial Relays

Amphenol RF, Danbury, CT

Amphenol RF has developed several high power microwave relays for applying directly to a printed circuit board (PCB) utilizing the SMT process. These designs enable the user to move from a frame-mounted package design necessitating a labor-intensive final assembly into the supporting product. In addition to the physical mounting of these earlier designs, hand soldering of the solenoid power leads was required as well as cabling of the NC/C/NO contacts to the main PCB.

Product Feature:

RoHS Compliant Bias Tees High Power, Weatherproof

Meca Electronics Inc. Denville, NJ

Development of RoHS compliant bias tees covering wireless band applications from 500 to 2500 MHz

Helical type resonators are widely used for frequencies below 0.5 GHz, mainly for mass and dimensional considerations. Replacing the more traditional TEM combline types or dielectric resonators by helical resonators significantly reduces the size and mass of the filters at the expense of the insertion loss. The rather complicated...

This article describes the design of a bias tee for a pulsed-bias, pulsed-RF test system. The cut-off frequency of the DC path was raised to allow pulsing of the bias signal. The theory of bias tee design for pulsed measurements is first presented. The simulation results for the design...

A novel defected microstrip structure (DMS), which behaves in a way similar to the known defected ground structure (DGS) unit cell, 1–10 is studied in this article. The unit DMS 3,4 is made by etching slots in the microstrip line, which then exhibits the property of rejecting microwaves at...

The electrical properties of a loss-less coupler, using TEM mode coupled lines, can be described in terms of even- (Z oe ) and odd- (Z oo ) mode impedances and its primary parameters [L] and [C] matrices 2 where L o and C o are the proper inductance and...

Branch-line couplers (BLC) are widely used as 90° signal dividers in microwave and millimeter-wave circuits. A BLC can provide two quadrature-phased signals from a single local oscillator for use in image rejection mixers. 1 It can be used as part of the feeding network for antennas to produce circularly...