Browse Prior Art Database

RADIO FREQUENCY TEST CONNECTOR

IP.com Disclosure Number: IPCOM000005929D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-16
Document File: 5 page(s) / 174K

Publishing Venue

Motorola

Related People

Tham Kim Hock: AUTHOR [+5]

Abstract

Many transceiver units provide a standard antenna port and a remote port provide for transmitted or received radio frequency (RF) signals. Normally, an antenna couples to the standard antenna port for receiving and/or transmitting the RF signals. On the other hand, the remote port is typically used for purposes auxiliary to the operation of the transceiver unit. For example, the remote port may be coupled to an accessory antenna of an accessory device. Additionally, the remote port may be coupled to a test equipment which tests the operation of the transceiver unit itself.

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MO7VROLA Technical Developments Volume 10 March 1990

RADIO FREQUENCY TEST CONNECTOR

by Tham Kim Hock, Amir Hamzah, Mong Peng Kheong, Chan Sek Loon and See Sek Hock

   Many transceiver units provide a standard antenna port and a remote port provide for transmitted or received radio frequency (RF) signals. Normally, an antenna couples to the standard antenna port for receiving and/or transmitting the RF signals. On the other hand, the remote port is typically used for purposes auxiliary to the operation of the transceiver unit. For example, the remote port may be coupled to an accessory antenna of an accessory device. Additionally, the remote port may be coupled to a test equipment which tests the operation of the transceiver unit itself.

   Providing an optimum impedance match between the standard antenna port, the remote port, and the devices are coupled thereto is a major consideration when designing the transceiver unit. Obviously, an optimum impedance match reduces signal losses and provides for an efficient flow of the RF signal through the port. Usually, the standard antenna port is easily matched with an antenna because the impedance of the antenna is known. However, because the load coupled to the remote port may vary depending on the purpose for which the remote port is used, the im- pedance of the remote port is designed to be a standard 50 ohm impedance. Physical connection to the remote port is usually achieved via an accessory cable inter-connected to an RF pad on the transceiver's housing. The other end of the accessory cable is terminated by an accessory device (or a conventional connector (N-type, or BNC) for coupling to the test equipment). Usually an impedance mismatch may occur due to inconsistent contact between the remote port RF pad and connecting pins of the accessory cable. This impedance mismatch may cause substantial RF loss between the transceiver circuitry and the accessory device or the test equipment,

   An improved accessory connector is shown in Figure 1 and 2. The spring loaded RF pin is inserted in a hole of a base plate of the accessory connector. The holes in the base plate are drilled such that, when the RF pin is inserted, a ten degree angle between the RF pin and the vertical axis is provided (see Figure 2). A SMA adaptor block is designed to hold a SMA fl...