Showing papers on "Balun published in 1980"

Balun coupled microwave frequency converter

Abstract: A microwave frequency converter is provided by a single mixer of the diode-quad bridge type which circulates generated image frequency within the bridge. The bridge is connected between balun coupled RF microstrip conductors and unbalanced LO microstrip conductors. There is zero connection length between the diode pairs to reduce conversion loss by preventing a phase shift between the image frequencies. Mutual isolation is provided between the RF, LO and IF signals over a broad frequency range. In an alternate utilization, the converter accepts transposed RF and LO signals, for broader bandwidth operation. The circuit may also be implemented as an up converter.

Broadband mixer with coplanar balun

Abstract: An improved broadband mixer includes a first balun (11) with a first signal port (12), a second balun (14) with a second signal port (15), a third balun (17) with a third signal port (18), and a frequency converter (19) coupled between the first, second, and baluns. The first balun means, which preferably receives an RF signal via said first signal port, includes two juxtaposed ground plane baluns 31 and 32 each having opposed, spaced, strip conductors in different planes. The second balun, which preferably receives an LO signal via the second signal port, has a coplanar balun (44) including three strip conductors in the same plane which in turn connects to two juxtaposed ground plane baluns (45 and 46) each having opposed, parallel spaced, strip conductors. The combination of the coplanar balun (44) with the two ground plane baluns (45 and 46) establishes signal polarities which merge end to end with the opposite ground plane baluns (31 and 32) to prevent signals from passing from one signal port to the opposite signal port without requiring cross-connections between the strip conductors in different planes opposite the ground plane baluns.

Balun coupled microwave frequency converter with single pair of diodes

Abstract: A balun coupled microwave frequency converter is provided by a mixer using a single diode pair with one port balanced and the other port unbalanced. The balanced port is provided by first and second coplanar conductors extending toward a common area and juxtaposed in spaced parallel relation with a transmission line interacting therewith to couple a field balanced between the first and second conductors across the common area. The unbalanced port to the mixer is provided by a third conductor. The diode pair is connected in series between the first and second conductors, and a point between the diodes is connected to the third conductor. One implementation is an up converter with an LO and an IF signal applied on the third conductor and input to the mixer to generate an RF signal between the first and second conductors and hence an induced output RF signal on the transmission line.

Equivalent representation of multiwire transmission-line transformers and its applications to the design of hybrid networks

Abstract: Aflshct-Lumped-element type equivalent representations of general multiwire transmission-line transformer3 containing ferrite torroids are presented. They are based on the physical model with cousideration of the mutual inductive couplings between all conductor segments of the winding wires. The concept of the mode of propagation is not used for the derivation of this representation. Signlficaut features of their Zn-port equivalent circuits are that they give transfer c%arwWWcs almost for all frequencies under any terminal conditions. So they are useful to the analysis aud the design of many kinds of the transformer circuits. As the applications, the design for hybrid networks cousistbqg of a trifilar wimling tramformer and Balun areexplained. Experimental results area heomparedwfth theory.

Antenna input unit

Abstract: PURPOSE:To simplify the connection between the power feed line and television and to make low in the loss, by making bundle the antenna input terminals in common use and separate for VHF and UHF. CONSTITUTION:When the VHF.CHF signal is mixed at the antenna and input from the coaxial cable, the coaxial cable 6 is connected to the input terminal 3. Thus, the VHF signal is branched with UHF signal at the branch unit 11 and output from the terminal 9, and UHF signal is fed to the UHF exclusive use terminal 4 from the balance terminal 5 for jumper via the branch unit and balun 12. Further, when VHF, UHF are connected with separate feeding lines, the VHF signal is connected to the terminal 3 and the UHF signal is to the terminal 4.