Future Wei Technologies, Inc.

Huawei Technologies Co., Limited

Huairen Yi

Zhengxiang Ma

Leonard Piazzi

A branch line coupler and active antenna system are provided. In an embodiment, the branch line coupler comprises four resonators. The four resonators are formed by a body and a grounded element. A resonator comprises a capacitor element and an inductor element. A first portion of the capacitor element comprises at least a portion of the body and a second portion comprises at least a portion of the grounded element. The inductor element is connected to the capacitor element in parallel. The inductor element comprises at least a portion of the body and extends to the grounded element. The first and second resonators are coupled by a first coupling, the second resonator and the third resonator are coupled by a second coupling, the third resonator and the fourth resonator are coupled by a second third coupling, and the fourth resonator and the first resonator are coupled by a fourth coupling.

Branch-line coupler

An elliptic combiner circuit filters a first and second signal in a first and second frequency band. A first resonator is coupled to a first input via a first capacitor and a second input via a second capacitor. A second resonator is coupled to a first and second signal path, coupled to the first and second input, via a third and a fourth capacitor. A first inductor is coupled between the first and third capacitors, and between the second and fourth capacitors. A third resonator is coupled to the first and second signal paths via a fifth, sixth, and seventh capacitors. A fourth resonator is coupled to the first signal path and a terminated port via an eighth, ninth and tenth capacitors. A second inductor is coupled between the fifth and eighth capacitors, and between the seventh and tenth capacitors. An output outputs the first and second signals.

Elliptic directional filters for a combiner circuit

A RF distribution network for split beam antennas is disclosed. The split beam antennas may include four-column cross-polarized user specific tilt antennas implemented in a 4T4R or 4T8R system. A RF distribution network may provide transmit signals from transmitters to antennas while also providing receive signals from the antennas. A RF distribution network may include 180&#xb0; 6.9 dB combiners coupled to the antennas and also coupled 90&#xb0; hybrids. A 180&#xb0; 6.9 dB combiner may include a transmission network with transmission lines in a 4T4R system. Alternatively, a 180&#xb0; 6.9 dB combiner may include a transmission network with transmit and receive filters in a 4T8R system. The transmission network couples the transmit filter and two filters by at least three &#x3bb;/4 transmission lines. A transmission network provides isolation between two receive signal paths and, at the same time, provides power splitting of transmitter power to two duplexed transmit signal paths.

Radio frequency distribution network for a split beam user specific tilt antenna

An integrated duplexer and combiner in a telecommunication system, such as a cross-polarized antenna system, is disclosed. An integrated duplexer and combiner may result in a reduction in the number of transmit filters used. A transmit filter may be coupled to two receive filters through a transmission network that provides isolation between the two receive signal paths and, at the same time, provide power splitting of transmitter power to two duplexed transmit signal paths. The transmission network includes first and second &#x3bb;/4 transmission lines coupled between inputs of the two receive filters. A third &#x3bb;/4 transmission line couples the first and second &#x3bb;/4 transmission lines to an output of the transmit filter. The two receive filters may have the same passband, while the transmit filter may have a different passband.

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Somerset, NJ, United States of America

Huairen Yi